Water Leaks (page 6 of 7)

Sliding roof/tilting roof  
 

Diagnosis: Ingress of water at sliding roof aperture 

Ingress of water at sliding roof aperture  

Cause: The sliding roof/tilting roof is installed in a water trap. The water drains off via the water trap, water drain 
holes and drain hoses. The drain hoses lead downwards on both sides via the A-pillar and C-pillar. The drain 
holes or drain hoses can become clogged with leaves, dirt, underbody protection and so on. 

The sliding roof/tilting roof is installed in a water trap. The water drains off via the water trap, water drain 
holes and drain hoses. The drain hoses lead downwards on both sides via the A-pillar and C-pillar.  
The drain holes or drain hoses can become clogged with leaves, dirt, underbody protection and so on.  

Corrective action: NOTE :  

 
Check the water trap for leaks. Check the drain hoses for leaks and for correct connection to the water trap. Check
the drainage system for unhindered flow, and blow out with compressed air if necessary. Check the external seal 
and the correct adjustment of the sliding roof. 

NOTE :  

 
Check the water trap for leaks.  
Check the drain hoses for leaks and for correct connection to the water trap.  
Check the drainage system for unhindered flow, and blow out with compressed air if necessary.  
Check the external seal and the correct adjustment of the sliding roof.  

Tailgate and Liftgate  
 

Diagnosis: Ingress of water into rear headlining area and luggage area. 

Ingress of water into rear headlining area and luggage area.  

Cause: The leak problems of the tailgate and liftgate correspond to those of the doors. In addition to this, the area 
to be sealed is much bigger. The routing holes for cables and hoses must also be sealed. The rubber grommets 
for the routing holes must be checked for damage and correct seating (fully unhooked). The mounting points of 
the tailgate and liftgate hinges may leak. 

The leak problems of the tailgate and liftgate correspond to those of the doors.  
In addition to this, the area to be sealed is much bigger. The routing holes for cables and hoses must also 
be sealed.  
The rubber grommets for the routing holes must be checked for damage and correct seating (fully 
unhooked).  
The mounting points of the tailgate and liftgate hinges may leak.  

Corrective action: Check the rubber grommets and renew if necessary. Check the hinge mounting points, and re-
seal with sealing compound if necessary. 

Check the rubber grommets and renew if necessary.  
Check the hinge mounting points, and re-seal with sealing compound if necessary.  

Forced air extraction  
 

Diagnosis: Ingress of water into side luggage compartment area 

Ingress of water into side luggage compartment area  

Cause: The forced air extraction for the vehicle interior is located in the D-pillar behind the rear lights. The rubber 
flap of the forced air extraction must be able to move freely. 

The forced air extraction for the vehicle interior is located in the D-pillar behind the rear lights.  
The rubber flap of the forced air extraction must be able to move freely.  

Corrective action: Remove the forced air extraction. Check the seal area between the bodywork and housing, as 
well as the rubber flap. Renew seal if necessary. 

Remove the forced air extraction.  
Check the seal area between the bodywork and housing, as well as the rubber flap.  
Renew seal if necessary.  

Rear window and moon roof  
 

Diagnosis: Ingress of water into the luggage compartment area 

Ingress of water into the luggage compartment area  

Cause: Rear window and moon roof leaking. Check for leak in the same way as for leaking windscreen. 

In the case of a sliding or tilting roof, the external rubber seal and the lock actuator or latch mechanism 
must be checked first of all. 

In the case of a sliding or tilting roof, the external rubber seal and the lock actuator or latch 
mechanism must be checked first of all.