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Do you have to remove the dash on a '99 Grand Prix to fix an evaporator core that is not draining and leaking water through the dash vents?
Wiki User
∙ 8y ago
No. You need to find the drain hose from the evaporator case, and clear the blockage from the hose and/or the case drainpipe it attaches to. Usually fishing up the hose from underneath (outside) with a piece of wire will do.
There is no drain hose however, just a nipple type plug that has to be cleaned out. It is hard to get to but easy to do. Look on the passenger side firewall about 1/2 way up and you'll see it. It just pulls off and the water will flow out that is backed up. Replace it when you are done.
I had the same water leakage problem in my 2000 grand prix and they told me that it was that hose blocked off. I cleaned it and it still didn't help. It ended up being bad weather stripping on the black platic cowl that lays on the windshield under the wipers. I removed it and replaced the weather stripping and havent had a problem since.
I had this problem, and the shop manual is just about useless to get it fixed. There is a rubber elbow, about 3/4" in diameter and 1-1/2" proud, that is pressed on to a port on the firewall. Make sure the engine is cool, because you have to reach down behind the engine on the passenger side of the car, near the exhaust takedown. It's about halfway down the firewall. I couldn't actually see it, but I felt water on the engine underneath it. When I pulled it out, it had a chunk of lint in it, and it was trapped where the boot points downward. I celeaned it out and put it back. I had to feel on the firewall for the port (it's metal and sticks out about a 1/2" from the firewall), and just pressed it back on.
Wiki User
∙ 8y ago
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