AC Evaporator Leak

[daisensei]

My '72 240Z with factory air has decided that I don't need the comforts of AC during the 5 months of summer here in Miami, FL.

I discovered a leak at the evaporator after running a black light over the system.

I have seen some products advertised that claim to stop leaks. Has anyone used these with any success? I don't mind trying as it has been difficult to find a replacement part. What are my alternatives in this case?

[Ed]

I hate to be the one to tell you but I'm sure someone else would have. Your factory A/C isn't factory. They were a dealer add on to boost the sales price.

I haven't heard about a product to stop A/C leaks. I have heard of a "seal conditioner". I guess it all depends on where your system is leaking if it would work. Personally I don't like to add things to any system as they might "gunk-up" something else. Also if you are running the older freon instead of the new 134r it would be a good time for the upgrade. The older freon costs up to $45 for 8oz (one can).

Depending on where your system is leaking you should be able to have it repaired. Look for someone that works on A/C systems and radiators. They will most likely be able to repair it.

Another option is you could move up here to New York. Summer hasn't quite gotten to us yet.

Good luck.

[daisensei]

Well, we ran the black light over the system this morning after charging and couldn't find any indication of a leak. The compressor shuts down prematurely when I adjust the temp. switch. This leads me to believe that it may be a faulty AC thermostat.

Anyone know where I can pick one up? Or is there a substitute available. I have been all over the www. and don't find anything.

It is hot here in Miami, but I was in Niagra Falls last May and that is definitely weather I would not miss.

[ChrisA]

Hi Eric, is your thermostat the rotary control type with a capillary tube extending down to the evaporator? If so you can go to your local Mack Truck Dealer and order number 4379-RD41720. This is a variable thermostat with a range of 34 to 52 degrees and has a 27 inch tube. It wont be exactly like yours but it should work. Current price is between $19.77 and $22.90 depending on if they give you a good deal or not. Although that's not much of a price difference.

Ed is right, no 240Z came with factory air and I have seen two different control pods in the cars.

Much luck,

Chris