1992 Oldsmobile Cutlass



September, 29, 2009 AT 8:15 PM

Air Conditioning problem
1992 Oldsmobile Cutlass 6 cyl Two Wheel Drive Automatic

I suddenly got water appearing on the floor under the passenger side mat while running the ac. I confirmed the water was not from rain and heard the problem was likely a plugged evaporator drain hole or tube. My problem is that I cant find the drain hole or tube to clean it our. I need to know exactly where it is and how to get to it, not just a general answer (like it should be under the evaporator housing). Nobody seems to know. Cant find in my repair manual. Please help! THanks.


3 Answers



September, 29, 2009 AT 10:49 PM

Hello -

To better assist you please tell me your specific model from the pic below and your engine size in liter. Also how many miles on your vehicle


Since it is on the passenger side are you sure it isn't engine coolant?



October, 2, 2009 AT 10:45 AM

It is a 1992 Cutlass Ciera S
It has just under 160,000 miles
It has a 3.3 liter 6 cyclinder engine
I'm sure the puddle in the passenger floor is water (not coolant)



October, 2, 2009 AT 3:57 PM

Hello -

Thanks for the info........

I ask about the coolant since many times when the heater core fails it leaks as seeps out on the passenger side. With 160K that is a possibility if not now in the future.....

The manual doesn't' show a good pic so I am going to attach a pic from a vehicle I have tore apart to give you an idea.

On the pic below, this is the passenger side. The drain hose you see going through the firewall goes into the engine bay. It connects to the base of your HVAC and drains the condensation. You may be able to slide your hand between the HVAC and the carpet and feel the hose....ensure it is connected. If so then let's go to the engine bay.


On the pic below you see your AC lines that go into the evaporator. Probably straight down from it on the firewall, you should see that drain hose that you saw in the pic above sticking through and pointing down...check to see if it is clogged with dirt etc. If so...you have found the problem. If not...then the next pic.


As you see from the pic, this is the inside of the HVAC, yours should be similar. The arrow is pointing to the drain hole that the drain tube connects to..then goes through the firewall. Gently ease something flexible up the tube as there may be something blocking this hole. I say gently as the evaporator sits right by that. If you puncture the evaporator no more AC and you have to replace it.....that is a job.......so please go easy. You may even try taking an air hose and gently blowing air up into it......


Let me know what you find out.

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