Does anyone know of the location of the ac relay on a '81 rabbit pickup? My ac is not getting cold at all. I think it's charged correctly, but I'm not 100% sure. If I could change the ac relay, I could eliminate that possibility.
The 81 doesn't really have a relay, it has a bunch of switches. The switch that controls the cooling is located at the top right of the heater box, and has a capilary tube that runs to the core.
A lot of issues with your a/c has to do with the heater valve not being fully closed or broken.
The heater valve replacement is a iffy thing and makes turning your control switch hard, so a better valve to use is the 1984 Porsche 944 non-vacuum heater valve. Make sure that your valve is fully closed prior to buying a new one.
Okay. So I got the porsche heater valve, but I'm not sure how to install it. There's an arrow on it which I pointed in the same direction as the old one. However, the cable is now on the bottom. Is that correct?
Ahhh, the mother of all Volkswagen wiring diagram books for your 80’s Mk1 VW. Enjoy the PDFs below, they contain the full wiring charts for the 82-84 lineup (Rabbit, Convertible, Pickup, Jet…
Down load them they are the wiring diagrams for the Westy, and have good pdf's of the relay locations.
On the westy's there really isn't a relay.
I would start by jumpering the compressor directly to the B+, there is a brown wire that is ground and the other color is the +12.
IF you jumper it and the compressor clicks then you know that the compressor is good, and that you need to trace out the wiring.
The High pressure and low pressure switches are normally closed, so they should be a direct short.
You did use the suction hose or low pressure side port to charge the system? usually located on the strut tower.
There is also the switch that is temprature controlled that is on the right side of the a/c box under the foot or floor vent. I have had that mess up.
to test the a/c temps switch you push on the relay contact.
To test the compressor there should be a connector that has 2 wires in it, one Brown the connector on mine is located here;
Jumper the non-brown wire to the positive battery connection. If it is working it will click.
Same as the a/c sliders have to be in the blue or in the defrost area, heater fan to position 1 or 2 key on then if you push the thermo switch it will click the compressor.
On the side of the heater box, passenger side. Up at the top, you may have to remove the vent cover. There is the Thermo-switch it is a relay controlled by a capillary tube that is inside of the heater box. With the system having pressure, Turn the car on not running, and the a/c in the blue and the blower switch in position 3 if you look at this switch it is a relay and you can manually pick it. If when you pick this you hear the click of the compressor then you probably have a bad switch....
Well, I finally got around to checking the AC thermo switch, and it looks like it went bad. The compressor clicked like you said and the capillary tube was broken. I was able to pull it out. However, I can't find a replacement anywhere. So if anyone has a good one or knows where I can get a replacement even if it's not an exact match, please let me know. The part number is 175 959 281.
Thanks for all your help Brian. Sorry for the confusion.
If you want one could wire it to a switch on the DASH...and use it as a compressor on/off switch
Cabriolets and Golfs of Euroversion had the switch on the heater controls, in the latter years with the change over to the more Cabriolet dash. The early ones had the switch on the side of the heater box. Not saying that you couldn't get a switch out of a Cabriolet and wire it in... you would just have to move the selector arm to Max a/c.
It is to prevent the Evaporator from freezing up, and allows it to turn off to defrost.