Recently had the non functioning AC in my 97 A4 serviced by a local mechanic. He used his Snap-On AC diagnostic center to vacuum down the system. He checked the various settings shown on the machine and finally added the Freon and also dye to help with further diagnosis should it be required. It was nice and cold and he noted that there was a possibility there was still a small leak and for me to drop by in a few weeks so he could use his light to check for any green dye leakage.

My cold AC lasted about 10 days total before it was back to no AC at all. I got the car back to him yesterday and he used his light and a long arm mirror to check the engine compartment very thoroughly…and saw no evidence of any green dye. He said next step would be getting it on a lift to look underneath. I was unable to leave it so that will have to wait to another time.

I have confidence in this mechanic…his reputation is exceptional and auto AC one of his specialties. So I will let him chase the problem to satisfactory resolution

But I wanted to let any of this groups AC authorities at least comment on what might be allowing the cold charge to go away so quickly and yet not show any evidence of a leak…that doesn’t make sense to me…but then again with AC I have almost no clue.

What say you?

Thanks

Bob

 

Bob

If there isnt ANY dye in the engine compartment, its inside the air box.

That means the Air Box has to come out and the evaportaor needs to be replaced. see if there is ANY green dye in the AC Condensate drain. on the passengers side fire wall area or inside the drain tube..

PS<< The evap replacement is labor intensive.

Bill

 

Holy Toledo Bill...your not kidding labor intensive...

https://www.corvetteforum.com/forums...t-it-open.html

I may just roll down my windows the way I have been doing for a while now.

Thanks Bill

Bob