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I still have the original heater unit in my truck, (don't know what it's called). I noticed that even with the heater fan and shutoff valve closed (the valve connected to the heater hose in the engine compartment. I still get quite a bit of heat coming into the interior from the heater core. Is there anyway to stop the heater from emitting heat when not in use?
I had the same problems with my stock heater. I replaced the water valve and that solved 90% of the problem. Then I disconnected the water hoses at the water pump for the summer.
I bought a universal shut off valve at the local auto parts store. It just splices into one of the heater hoses under the hood. there's a small T handle on top to shut off the water manually, in the summer.
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XFM...
I have the shut off valve that splices into the hose and its in the off position. Maybe its not sealing off the water? I may get a new one and see if that helps. I may put a "U" shaped tube in the ends of the hose lines and bypass the heater core, at least for the summer. Thanks for the advice guys.
I also had the same problem and disconnected it. Ed, we live in California.
I think we finally found out the problem! The rest of us are freezing and wanting our heaters to work better...then there is the left coast crowd who are too warm in February.
I guess when (if) it warms up I will be looking for one of those shut off valves.
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