Glen McCartney

I've searched through archives and could not find the answer. I am getting ready to do a manifold refinish and under manifold clean up. While I'm in there, I'm going to change my heater flow control valve. The replacement is directional. Was wonder how the water flows - does it go from block to the heater core - or does it flow from heater core into the block?

Thanks,
Glen

Garth S

IIRC, the flow is from the engine (head) into the core: The valve is installed so that the direction of flow 'pushes' the valve disc against its sealing face when closed - more like a check valve, for while it will still operate if installed bassackwards, it will not seal when closed.

SharkSkin

Comes off the top of the passenger side head -- fitting at the rear -- goes through the valve, then the core, then back to the block.

Glen McCartney

Thanks!

Normy

A picture is worth a thousand words. Print this out then install your heater valve.

N!

PS: See that rubber tube that comes out of the valve on the right side? It's about 4 inches long. Replace it while you are in there....

SharkSkin

And don't forget to hook up the vacuum line, like Normy did...