Question about Chevrolet Suburban 1500

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After a slow steady rain, the passenger side carpeting is soaked. I have confirmed it occurs when parked, it doesn't have to be driven. I have had a body shop test the windshield with a hose and they say it isn't coming from there. I'm concerned with trying a dealer with an open ended problem, just hunting for it charging by the hour with no guarantees of a fix. I have a small wirey wife and a good flashlight (the flashlight promised not to leave me). My plan would be to have her looking under the dash when I hose the firewall with the cowling off and try to find the leak. I have spotted a small drip about where a passenger's feet would be resting on the angled part of the fire wall after a rain. About two years ago I had the air conditioner replaced and now find what appears to be a bolt missing on a circular clamp that holds a cylinder on the fire wall in that area under the hood (dryer or something I think was replaced at the time). I can not see any hole where the bolt would go but am sure it's there. The inside of the firewall has a rubber flap with a sound insulation material under it that is wet when the leak occurs. It makes it difficult to see up under it as it is tight against the fire wall. The vehicle is a 1996 Suburban 4W drive. Any suggestions on trouble shooting techniques or possible sources of the leak? The windshield test seemed quite thorough and I suspect the leak source is lower down. Dave

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  • Suggins Apr 29, 2010

    Thanks, I think! This is one of those sweet mysteries of life. I will follow your suggestions except removing the dash. I may consider kerosine prior to that.

    D

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Well if you want to be 100% sure your only choice will be to remove the dash because it blocks your view

however, before you go through all this take note of the following...

I have chased many leaks after other techs have replaced the windshield, only to find that once the water drips down the windshield it also goes under the hood

this is were I have found that it then migrates its way into the HVAC case

Therefore, pull your blower motor and see if the inside of the case is wet

if it is not wet then I suspect the first diagnoses of the windshield leak is correct

Posted on Apr 29, 2010

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