Just got my bus started, an 83 Westy with the 1.9 wasserboxer, and (I know this is crazy problem to have in a VW) my defogger, and heat in the front is blowing only cold air. The engine and rad are at temp, and the heat under the bench seat blows hot, but regardless of how I tweak those crazy VW controls, the heater up front blows cold. Is there a hose, or air line that is common to fall off? Wondering if I'm just getting fresh air, without it first getting heat. Just wondering if theres a common problem with this before I start looking.
Drop your spare tire down and look up behind the radiator, you should see the heater control valve. Verify that it is working when you move the lever. This is a common problem. The valve is pretty stiff and the cable has some sharp bends, a bad combination.
guess I never responded to finish this one up, when I took the bus in for its spring rad flush and fill I got it back and everything worked, guess my mechanic fixed it for me!