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Evaporator drain

Jamesbond on Wed July 29, 2015 3:45 AM User is offline

Year: 2000
Make: Chevy
Model: Express
Engine Size: 5.7
Refrigerant Type: R134a
Ambient Temp: 93
Country of Origin: United States

If I shut A/C off you can hear like ice cracking. After it gets warm water will start leaking out of bottom seams of the evaporator housing.
Yiu never see water dripping out while the AC is on.

It was doing the same thing last year. I removed the blower motor and cleaned out leaves and other debris from in front of the evaporator.
I vacuumed it out and blew it with compressed air. I could not get behind the evaporator. Was a lot totaled off and I ran out of time.

I never found the drain tube.

I was stuck in best toady.
It was low on freon. I added some with one of those hoses that you tap into the can.
Last year I put gauges on it everything look okay.
It does not blow as cold as it should. I did not pull a temp but I would say in mid to upper 40's
I did notice take a reading. I know the air coming is humid. Being that inside is large it is not easy to cool.

I tried feeling around the evaporator case to find the tube. It is hard to see because it is a van not a lot of room under the hood. You can not see most of the evaporator case from below.

I was thinking of removing the blower motor and try pouring water into the case either to dislodge ant debries in the tube or maybe i can see where the drain tube is.

Another thought was to take a 3/16 drill bit and drill a hole in the bottom of the case. Even that will be hard. Lot of of stuff below to get a drill in?
Any suggestions please
Thank you

mk378 on Wed July 29, 2015 8:50 AM User is offline

If it is icing up, unplug the pressure switch on the accumulator-- if that makes the compressor stop, replace switch. Switch has a shrader valve under it so it can be R&R with system charged.

Edited: Wed July 29, 2015 at 8:51 AM by mk378

HECAT on Wed July 29, 2015 9:25 AM User is offline

I have a 06 Express. Condensation drains from the bottom of the black firewall forward Evap box, into the inner fender, where it runs down to the frame, and will normally hit the ground under the front of the passenger seat. If on a steep forward slope, it runs on or thru the frame rail and hits the ground under the front bumper.


HECAT: You support the Forum when you consider for your a/c parts.


Jamesbond on Wed July 29, 2015 11:56 PM User is offline

I will check the pressure switch.
I saw in parts that I think the drain tube is more like a hole with a sort of bushing around it.
I will look for it again.
I saw you guys don't like arctic freeze. Should have checked before claimes sounded to good.
I thought I would regret putting that in.

I should have it removed from system and pull a vacume or Flush it?
Do it now or might as wait till it starts giving me problems and replace compressor?
Truck original compresor and was not well take care of. Has over 100K miles on it
Thank you for the advice

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