My heater will not blow hot air, what dp I start with as far as trouble shooting?? The blower works just fine but no hot air, or A/C for that matter, but it apparently has a refrigerant leak.
Any help with this will be greatly appreciated....
Adam

 

Check the heater valve that controls the flow of hot water. It's vacuum operated, closing off water flow when vacuum is applied to the diaphraghm, and sits under the airbox. Interesting that you should get NO heat. Maybe a constant vacuum source has been attached to the valve, or it has been bypassed. Getting the AC to blow cold can be anything from a fuse, belt, or vacuum line to just about anything/everything. Lots of info here, search old messages. For now though, here is a pic of the heater valve, top right with the orange hose.

 

Yeah, that's a different one. Usually the problem is you can't get the heat to come off..

That valve is cheap and easy to replace. You should be able to get it to cycle by hand, maybe it's just sticking...

 

... just to add, if you haven't done it previously, the heater valve shown in Dave's pic is located under the air cleaner box in front of the firewall: Four 10mm nuts under the air filter, and you are there ...
The heater valve fails open (with no vac) - which should give lots of heat: however, if there have been problems in the HVAC system, POs have been known to tie/tape the actuator arm in a closed position .

 

Some COs (Current owners) heve been known to do the same thing!

 

Mine is twist-tied shut...

If I can't find the vacuum leak under the dash this winter, I'm thinking about installing a manual choke control cable, with the pull-handle concealed in the glove box, so I can manually open and close the valve from the comfort of the cabin. That would be so, like, 20th century dudes!