How to test the A/C relay
 

When I purchased my 964 Turbo, one of the items to look into further was the air conditioning. With some time off from work coming up, I thought I might look into this now, before the Georgia summer is upon me.

The compressor is not seeing power, so I am thinking the first place to check is the A/C relay. Part below -

Pelican Parts - Product Information: 811-951-253-M100

Can anyone walk me through how to verify if the existing relay is the problem?

Also, with this being a "double relay" (controlling both the blower motor and a/c), is it possible for just one of the two accessories to be not getting power? Said another way - if the relay is the source of the a/c problem, would I be having problems with the blower motor as well?

Thanks,
John

The relay you mention is identical to the relay used for the oil cooler (and, indeed, for the rear blowers too) so a simple swap would confirm your thoughts.

In reality it's unlikely to be the relay as the a/c system has a pressure switch up near the evaporator which prevents the compressor being activated if there is insufficient gas pressure in the system. Before spending money on parts it's probably worth getting a a/c specialist to do a pressure test and a re-gas if there are no leaks and see what happens from there.

Regards

Dave