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NHTSA ID Number: 10130814

Manufacturer Communication Number: IK1600131

TSB/Document Date: 2018-04-02


Summary

Cab Water Leak Troubleshooting Tips; primarily for Sleeper cab models and some aspects may also apply to all cabs excluding 5000,9000, PayStar, cityStar


IK1600131 ­ Cab Water Leak Troubleshooting Tips

Page 1 of 8

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Document
IK1600131
ID:

Availability: ISIS, IsSIR

Revision:

7

Major
System:

CAB / SLEEPER / HOOD

Created:

3/8/2011

English

Last
Modified:

2/9/2018

Author:

Pablo
Guerrero

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Language:

Other
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Title : Cab Water Leak Troubleshooting Tips
Applies To : This primarily refers to LT, RH, ProStar, and Lonestar sleeper cabs. However some aspects may also apply to
all cabs in the High Performance Vehicle family - LT, RH, ProStar, LoneStar, TransStar, WorkStar(HV), DuraStar(MV), and
TerraStar. 9000i, PayStar(HX), CityStar are not covered in this document.

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
02/06/2018 - Added Reference to LT, RH, MV, HV, and HX. Added Roof Marker Light Leak/Fix Issue.


NOTE: This document has been updated to include a repair procedure, please read this before proceeding with any of the troubleshooting
techniques.
If a cab has a known leak, it is not necessary to go through all the troubleshooting steps below. Skip straight to the resolution portion of this document and
perform all the listed repairs, as this is very likely to resolve the concern in a single repair with no need for interior trim removal or roof removal. The entire job
cab be done in 4 hours or less. If leaks are still identified after performing the repair, then the below symptoms and troubleshooting sections may be helpful in
further diagnosing the issue.

DESCRIPTION
This document is intended to highlight areas that have been known to be the source of water entering and/or appearing inside the cab in order to help focus
troubleshooting activities. Areas in the past that have been identified as possible sources are:
1.
2.
3.
4.
5.
6.
7.
8.

Condensation from the use of auxiliary sleeper heaters that are not hooked up to draw fresh air during operation.
Sunshade mounting
Roof Marker Lights
Door seam
Cab seam above the rear corner of the door
Roof seams
Roof/cab bond joint
Windshield seal

AREAS OF CONCERN AND COMMON SYMPTOMS
In general, evidence of water above the roof/cab joint will be related to condensation or gaps in the roof seams and/or roof attachments (air deflector, satellite
mounting, etc.). Evidence of water below the roof/cab joint can come from a number of different areas that should be systematically considered.
1. Condensation
◦ Presence of water is independent of the presence of external precipitation
◾ It's usually present after the truck sits in cold conditions for a long period of time with a heater running and the heater is set to recirculation
mode, or the heater has no access to outside (fresh) air. For example: sleeper­only heaters.
◾ Water may not show up immediately, but most likely after a short period of running on the road. Usually a reasonably hard maneuver (i.e.
turns) will push the water to a location where it can drain from where it had collected in the roof substructure into the driver compartment.
◦ Water usually drips from the center overhead console (CB cubby area).
◦ Water can also drip out over the driver or passenger side doors (radio speaker area).
◦ If conditions are extreme or if condensation is excessive, water can collect on any or all interior roof trim panels.
2. Sunshade mounting

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Water usually drips from the center overhead console (CB cubby area).
◦ Water leaks from the sunshade mounting can originate where the bracket mounts to the cab or where the sunshade mounts to the mounting
bracket. One or both areas may not be properly sealed.
3. Roof marker lights
◦ Each marker light is held in place with two #8 SS sheetmetal screws. One goes directly into the cab roof and the other goes into a U-nut clip.
Sometimes the U­nut tears the foam gasket. Sometimes the screw that goes directly into the cab roof strips and causes the gasket not to
compress and seal.

Be sure to remove and inspect all five marker light seals and be careful to not over torque the fateners upon reinstallation.

◦ Remove each marker light to inspect and verify seal integrity. (See attached photos for example of defective seal.)
◦ Check all five marker lights as more than one could be leaking.
1. Door Seam
◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Water drips from above the driver or passenger side door.
◦ Water drips from the top of the windshield on the outboard driver or passenger side (approximately below where the outboard sunshade mounting
points are located).

Although this seam is covered by the door seal, water can work it's way
under the seal and through this seam if this seam is not sealed
properly at the factory.

1. Cab seam above the rear corner of the door
◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Water drips from above the driver or passenger side door.
◦ Water drips from the top of the windshield on the outboard driver or passenger side (approximately below where the outboard sunshade mounting
points are located).

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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1. Water enters here.
2. Water exits here and drips down the inside of the windshield.
2. Roof seams
◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Location where the water drips can vary depending on where the gap is in the roof seam.
◾ Due to the design of the roof structure, water is most likely to travel along internal seams and joints and collect in the forward portion of the
roof structure.
◾ The final exit point is most likely to be in the forward cabin (over the the driver/passenger side doors or at the center overhead console/CB
cubby area).
◾ The following areas have been identified as possible areas of concern. This is intended for guidance but is not necessarily all inclusive.
Skyrise is shown, but Highrise is a similar construction (although seam locations and joints will vary).

All roof seams should be checked for cracks or voids in the sealer.

Seams at the rear corners of the Skyrise cab should be checked for
voids.

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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After penetrating the outer seams, water can travel along internal
reinforcement bond lines, ultimately draining into the trough formed by
the lower roof panel and dumping near the front center of the driver
compartment.
3. Roof/cab bond joint
◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Location where the water drips can vary depending on where the the gap is in the roof/cab bond joint.
◾ Gaps are more likely to be found above the driver/passenger side doors and rearward through the transition panel area.
◾ Gaps in the front section of the roof can lead to water dripping from the center overhead console (CB cubby area).
4. Windshield seal
◦ Water typically presents itself during or shortly after driving through inclement weather or when subjected to a truck wash.
◦ Water drips around the edges of the windshield.

TROUBLESHOOTING
Several methods can be used for troubleshooting water leaks. Regardless of the method, the troubleshooting process should be rigorous and disciplined. If a
disorganized approach is used, the likelihood of not finding the leak point or not repairing all leak points on the same service call increase significantly. Use
the above information to narrow down the areas to investigate further.
Visual Inspection
• All exterior joints and seams should be visually inspected to determine possible problem areas.
• Look for any cracks or voids.
• Once suspect spots are identified, these areas should be further investigated using one of the following methods.
1. Soapy water method
Tape off major air escape points on the cab
◾ Cab exhauster and door handles are must
◾ Any other areas where air could escape and are known not to be contributing factors to the leak. For example, there is water dripping from
the CB console: taping off the luggage compartment door will not affect that leak path and will when pressurizing the cab.
◦ Turn the HVAC to recirculation mode and set it to run on HIGH.
◦ Spray a soapy water solution on the suspect areas
◦ If bubbles form, there is a leak path in that location that should be addressed.
2. Pressure washer method
◦ This method should be used if the soap and water method does not yield results.
◦ This method may require the removal of trim panels in the area where the suspect leak points are identified such that you can see if water is
entering.
Tape off all exterior joints, pressure wash all suspect areas, and inspect for leaks.
◾ If no leak is found, remove a section of tape and repeat the process. Start with sections of tape in the areas that looked suspect on
inspection. The goal is to methodically test all the suspect areas and identify which are actually contributing to the leak.
◾ If a leak is found, note the area for future reference. Retape the bad section and continue the above process until all suspect areas have
been tested and identified as being problematic or not.

RESOLUTION
If there is a water leak in the upper portion of the cab, perform all the following repairs.
Materials List:
Part Number

Description

Quantity

N/A

Isopropyl Alcohol

1 bottle

2611723c1

Dow® BETASEAL™ Glass Primer (20cc bottle)

1

2611726c1

Bostik® SuperTrans™ (10.3 oz. cartridge)

1

2611722c1

Dow® Great Stuff™

1 can

3523427c2

Foam Seal

3

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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3820148c1

Bolt, M10-1.5 X 35MM HEX HD, TMS-4518

3

Blue 242

Loctite® thread lock - OPTIONAL*

1

2611725c1**

3/8" Foam Cord (50 feet)

1

2611724c1

Loctite® 5510 - Black

2

* Loctite should be used if 3820148c1 is not available and the original bolts are being reused.
** 3/8" caulk backer rod/caulk saver cord can be used if 2611725c1 is not available. Caulk backer rod can be found at any home improvement store.
Sunshade Mounting Leaks
1. Remove the marker lights to access the sunshade attachment bolts.
2. Disconnect the wire harness.
3. Remove the sunshade from the vehicle at the three mounting attachments and dispose of the fasteners (if the replacement fasteners, 3820148c1,
are not available then keep the original fasteners for reassembly).
4. Remove and dispose of the foam gaskets on the mounts.
5. Thoroughly clean the fasteners that attach through the sunshade mounting brackets as well as the perimeter surface of each mounting bracket
with IPA (isopropyl alcohol).

6. Allow the surfaces to dry.
7. Apply Dow® BETASEAL™ (2611723c1) to the same areas cleaned in Step 5.
8. Immediately wipe off the surfaces (prolonged exposure to the Dow® primer could damage the paint). These surfaces are now prepped for good
adhesion to the sealer.
9. Apply Bostik® SuperTrans™ (2611726c1) on the fastener holes on each mounting bracket.
10. Apply Bostik® SuperTrans™ (2611726c1) all the way around the perimeter surface of each mount.
11. Allow sealants to thoroughly cure to a tack free condition before continuing.
12. Mask around the area of the center mounting bracket to protect the windshield and painted surfaces.
13. Spray Great Stuff™ (2611722c1) into the cavity of the center mounting bracket to seal the wire harness from water intrusion (spray into the wire
harness pass through hole, see Arrow 1 in the figure for Step 14). The Great Stuff™ will expand and seal the cavity so only a partial can is
needed.
14. Position the wire harness such that it remains centered in the pass through hole as the foam cures around it.

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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1. Keep the harness centered in this hole.
2. Masking tape works well for holding the harness in position while the foam cures.
15.
16.
17.
18.
19.

Allow the foam to cure before continuing
Remove any excess Great Stuff™ as required prior to re-installing the sunshade.
Install foam seal part number 3523427c2 on each of the three mounting brackets.
Connect the wire harness of the sunshade to the wire harness seated in the mounting bracket.
Install the sunshade to each mount, fastening the sunshade with part number 3820148c1 into each hole at 15 ft-lbs (180 in-lbs) torque. If these
parts are not available, the original fasteners can be used provided blue Loctite is applied to the threads prior to reinstalling.

• Door/Cab Seam Leaks

1. Remove the secondary (outermost shed lip) seal from the door frame.

2. Use a brush to remove dirt and foreign material from the now exposed metal flange. This is especially important if there has been a prior
seal/repair in this area.
3. Using IPA (isopropyl alcohol) clean the exposed sheet metal joint along the full length of the weld flange as well as adjoining sheet metal
seams and any other suspect locations (visible voids/gaps) in the immediate area.

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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4. Allow the surfaces to dry.
5. Apply Dow® BETASEAL™ (2611723c1) to the same areas cleaned in Step 3.
6. Immediately wipe off the surfaces (prolonged exposure to the Dow® primer could damage the paint). These surfaces are now prepped for good
adhesion to the sealer.
7. Apply Bostik® SuperTrans™ (2611726c1) to the prepped surfaces. Force material into the joint where possible. For best results, apply sealer into
the seam wiping in both directions.
8. Allow material to dry until the adhesive is tack free.
9. Reinstall the secondary seal.

• Roof Seam Leaks (SkyRise only)

1. Using IPA (isopropyl alcohol) clean the seams/joints and any other suspect locations (visible voids/gaps) in the immediate area.

2.
3.
4.
5.
6.

Driver side shown, passenger side symmetrically opposite.
This area is illustrated due to it's obscurity as a water entry point.
These instructions can be used on any roof seam that exhibits a void or
inconsistancy in sealer.
Allow the surfaces to dry.
Apply Dow® BETASEAL™ (2611723c1) to the same areas cleaned in Step 1.
Immediately wipe off the surfaces (prolonged exposure to the Dow® primer could damage the paint). These surfaces are now prepped for good
adhesion to the sealer.
Apply Bostik® SuperTrans™ (2611726c1) to the prepped surfaces. Force material into the joint where possible. For best results, apply sealer into
the seam wiping in both directions.
Allow material to dry.

Roof Joint

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IK1600131 ­ Cab Water Leak Troubleshooting Tips

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1. Clean the perimeter of the Roof to Cab Joint with IPA or Clean Paint Solvent. Clean as far up into the joint as feasible. This joint needs to be as
clean as possible.
2. Insert 3/8” diameter foam cord (2611725c1) into the roof cab joint, starting at one of the rear corners before working your way around the cab.
This will provide a backing for the sealer to be applied later.
3. To start, loosen the cab extender bolts and insert the start of the foam cord into the roof/cab joint on the forward side of the cab extender.
4. Push it through to the rear of the cab (behind the cab extender) so that there is 6-8” of foam cord rear of the cab extender. This can be pushed
up into the rear corner to fill some space.
5. Insert the 3/8” diameter foam cord into the joint forward of the cab extender and continuously work around the perimeter of the cab.
6. Repeat the steps above at the opposite rear corner.
7. Insert the 3/8” diameter foam cord into the roof/cab joint along the entire length of the back panel.
8. Mask the entire perimeter of the joint between the roof and the cab to get the best possible appearance of the sealer and protect the surface
from getting unwanted material on the painted surface of the cab or roof.
9. Apply Loctite® 5510 – Black (2611724c1) into the joint generously and continuously around the perimeter of the cab.
10. Use your finger or a tool to finish the joint to a smooth finish.
11. Remove the masking tape and allow the material to dry for 6-8 hrs before releasing the vehicle for service. Do not wait for the sealer to cure
prior to removing the masking tape, as it could make removal of the tape more difficult.
12. Retighten the cab extender bolts.
13. Allow 24 hrs before washing with a high pressure wand if ambient conditions are warmer than 60 degrees F. Otherwise allow 72 hours.

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