raztek

Pulled the beast out this weekend - man it was nice, but I digress - today went to turn on the A/C. The light on the switch came on, but 2 or 3 seconds later, it switched off. Tried repeatedly, set temperature to 15C/50F - it was 25/78F outside, so it should have come on without a problem. I set the air to come out of the windshield vents as it defaults to an A/C setting when doing this, but the light kept going off after 2 or 3 seconds and no A/C air, just outside air. And yes, I was using it correctly.

Question: Anyone experience this? What could be causing this - bad switch (probably not), bad relay (not tripping and the switch turns itself off when a constant voltage is not returned), bad compressor (ouch, don't even want to go there). Everything worked at the end of last year.

Could this possibly be a result of a completely drained battery (forgot to disconnect it before storing) and then had to get a boost? If so, what do I need to do to reset, or did I fry something when it was boosted?

Thanks in advance for the help. Can anyone with a service manual see if there is any write up on this kind of scenario. I'm going to check the relay/fuse panel tonight but any other ideas would be helpful.

Cheers

raztek

No one has any info on this?

Midwest Vette

Did you notice if the light was blinking? On the auto hvac systems when the light blinks it is sending a trouble code. You will have to go into the DIC to see what the code is. If I was a gambling man, I would say you are low on freon. Gook luck.

tiki240

MINE BLINKS!!!! but i have no new codes on the DIC

myk7

The light blinks and goes out when it is low on refrigerant too.

Midwest Vette

Yes.

JazyJeff13

Agreed

Todd157k

Mine does it too.. but because I spliced into the low pressure sensor for my wideband. When I switch it to wideband (the ac sensor is then disconnected) it does exactly the same thing.. which should mean low pressure level.

cruisemon

Refrigerant is low. Try putting in a can of the stop leak stuff followed immediately with a can or two of r134. Low side pressure can be as low as 20 psi depending on ambient temp, but memory says closer to 30 psi on low side and max of about 150 on high side will give you cold air. Anyone have their Helms near by and can check these pressures?

Charlie

raztek

Thanks folks! No it doesn't blink, lights up when I hit it, then 2-3 seconds later goes off. Hopefully its something as simple as low refrigerant...may have to take a trip into New York to get it fixed as I think they passed some legislation on the freon that can be used up here in Canada.

old stingray

Turned mine on today,I have the same problem! Hope to check it out when I find the time,but it was a good excuse to drop the top

Got uid0

The problem is like everyone else here has had

you have a bad outside air temp sensor "thermosensor?

its located passanger front nose bumper area

do a search here for a/c temp sensor

tiki240

if he has a bad outside temp sensor, he should be able to unplug it, and the A/C will work again.

Got uid0

Is that really true? I could not unplug mine as it was rusted together

Have you done this?

raztek

Can anyone confirm this?

old stingray

Any luck yet on finding the problem?

RGAZ

If you do throw a set of gauges on it, refer to the R134 Temperature/pressure chart. The low and high side pressure vary Vs. ambient temperature.

I.E., if you fill to recommended temp and it is 40F outside, when it is 100F outside the high side pressures will be destructively high.

If the compressor has a release valve it will release the excess to the atmosphere. It not the compressor will self destruct.

Good luck!
Rgds,
RG
AZ