Question about 2002 Oldsmobile Silhouette

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Water leaking passenger side firewall

I have a TON of water leaking on the right side of a 2002 Oldsmobille silhouette. I have taken the glove compartment out but all thats behind that is the heater fan with those Hepa filters. I did take those filters out and cleaned them while I was there. however I cant find a leak ANYWHERE after doing this. It is leaking somewhere between the engine compartment and the inside cabin but I cant find it anywhere. Also it only leaks when the heater is turned on. No other time does it leak.

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  • ofblong Nov 04, 2008

    Well I should mention that I have filled the reseviour twice in the past week and a half (today was the second time) because it was empty.

  • ofblong Nov 04, 2008

    Ok so far I found that what I thought was a heater core location is the Condensate drain like emissionwiz stated. There is a TON of condensate coming out of the drain. I dont see a valve but I didnt stick anything in it yet. I also noticed that the manifold gaskets are leaking slightly again but it doesnt seem like enough of a leak to drain the reseviour in a week. I am assuming the gasket is still under warranty since it was replaced a year ago. If I remember correctly the seals are 3 years 30k miles from when they were installed???? It was replaced when the van had its manufactureres warranty. the radiator is full so I am getting confused lol.

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  • Oldsmobile Master
  • 6,674 Answers

If your hoses for your heater are attached at the firewall, I would be tempted to remove them, check the ends of your hoses and trim them back a bit just to see if one of them wasn't the source of your leak. Clean fittings before re-attaching. Make sure your drain tube from heater housing isn't plugged also.

Posted on Nov 03, 2008

  • Mike Butler
    Mike Butler Nov 04, 2008

    If your reservoir needs to be topped up that often, you obviously have a leak. I'd say take the time to make sure it isn't just a loose or cracked fit at heater core fittings, otherwise your probably looking at a new heater core. You can take the 2 hoses off at firewall and join them together for testing. (that will obviously by-pass the heater core that way) If no leak inside, then I'd say you've found your problem.

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  • Oldsmobile Master
  • 61,037 Answers

This sure sounds like the AC condensate drain is plugged, if it is allot of condensation water builds up in the heater/AC case and leaks in on the passenger side, the drain is located on the pass side under the hood down low on the firewall, it is most cases it is a rubber nipple about 1/2 inch in diameter sticking out of the firewall with a little flapper valve in it, stick your finger in it or a stick and see if water drains out.

Posted on Nov 03, 2008

  • yadayada
    yadayada Nov 04, 2008

    This may be the heater core, scratch the idea of the condensate drain.

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