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No water out of evaporator drain

70monte on Wed August 29, 2007 4:21 PM User is offline

Year: 1998
Make: Chevrolet
Model: K-1500
Engine Size: 5.7L
Refrigerant Type: R-134a
Ambient Temp: 89 F
Country of Origin: United States

Today while driving my 98 chevy truck with the air on, I noticed that when I parked the truck, no water was dripping from the evaporator drain. I let it run for a few minutes and still no water. I shut the truck off for a few minutes and then turned the air back on Max and put the fan on high and water came pouring out of the drain. Outside temp is about 89 degrees and vent temps feel cold.

The lines coming out of the compressor and going to the accumulator and the lines going in and coming out of the evaporator and going to the condensor were very cold and all about the same temperature.

When no water was coming out, the AC setting was on Max with the blower one step above low.

Last week I repaired the system, installing a new compressor, accumulator, OT, condensor, O-rings, and new manifold lines. Vacumned the system down and recharged. I don't appear to have any leaks.

Is this normal for the evaporator not to drain water out sometimes? And if not, what is the cause?. I don't think the drain is plugged because water came out when I ran the AC the second time and yesterday when I drove the truck. Thanks for any input.


PS. I don't have my gauges here right now so I can't take any pressure readings.

Chick on Wed August 29, 2007 4:28 PM User is offlineView users profile

The water comes from the air passing over the evaporator, so if it's humid water will be removed, but if you had it on recirculate, most of the water had been removed before you checked it..Letting it sit a while, moisture laden air was again present, and when you started the ac, that water was removed..Using outside air on a humid day will make more water come out of the drain..Inside air, less water..Hope I explained that so you can understand it...But it appears to be working as long as when it drains, it drains "outside" the truck and not on the passenger floor...

Email: Chick


Freedoms just another word for nothing left to lose

70monte on Wed August 29, 2007 5:26 PM User is offline

thanks for the explanation and I do understand what you are saying. I did have it on recirculate the whole time so that explains what I was seeing.


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