Hawkdaddy

Hello all! just finished t-stat timing belt water pump serp and still lukewarm heat! back flushed but all clean.heat on both hoses to heater core. I heard that it could be a cabin filter and it appears they are for sale but I cannot find where it is located. Any ideas before I freeze this winter? Thank you

CRAZY_RUSSIAN

whats the problem?
American B4 did not come with a cabin air filter, but you can view the suction duct on the passenger side, under the hood, under the windshield bottom cover

Rusty Spokes

The heater/fresh air flaps have a foam cover which deteriorates and comes off. The flaps have holes in them and you will not get very good heat as the flaps will not blend/stop the outside air.


And the heater core will get plugged up too. The Behr units have some swirl inserts which capture every little piece of rust. Impossible to "back-flush" the junk out of there. And both hoses to the heater core will feel hot, so you think it is working..but the hot coolant flow is very low..so you will not get good heat.




In my case I removed the dash and replaced the heater core and disassembled the air box then re-wrapped the flaps. I used some metal like duct sealing tape.




Yes, it is some work but when Winter came around..I had great heat.

Hawkdaddy

thanks much! I think Rusty hit it on the head.Of course now its leaking power steering fluid I think

Hawkdaddy

Thank you Rusty. sounds like a pretty rough job. The pic with drill bits? aer you cleaning the core?

Rusty Spokes

Those are not drill bits..believe it or not..those are "turbines" metal swirls from the factory inside the OEM heater core. I suppose they are installed by Behr to maximize the heat transfer..but they easily plug up. I took my old heater core apart and discovered them inside. Took the pictures.