67 air conditioner problems
 

I am having problems with my a/c. The clutch isn't engaging when I turn on a/c fan. I know on the 67 you have to put the lever on a/c and on cold and then turn on the fan to make it come on. The fan comes on. With all that done, clutch still doesn't engage. I made sure the fuse was good and that the plug on the compressor was plugged in good. I have a relay in the circuit and there is the fan switch itself. Any suggestions as to where to start the tracing process? What is the most likely thing to go wrong. I had the a/c serviced last summer and the truck has set in the shop all winter. Yesterday was the first time that I tried to use the a/c and found that it didn't work. Any suggestions would be appreciated. Thanks

Re: 67 air conditioner problems
 

It sounds like it is low on charge.

Mine did the same thing and I charged more freon in it and it now works.

Danny

Re: 67 air conditioner problems
 

I would guess low charge.

Re: 67 air conditioner problems
 

Do you have power to the ac clutch. Does the clutch engage.

Re: 67 air conditioner problems
 

I haven't jumped the clutch power to see if it will engage or if it is something else besides a power issue.

Re: 67 air conditioner problems
 

Unless it has been added there is not a low pressure switch on the compressor. I would suggest using a jumper wire to the compressor, (positive side) to see if the clutch will pull in, engine off).

Here is a diagram of the wiring on the AC. (I have not seen trucks with the anti-dieseling relay so yours probably does not have one).