Compression Ignition Addict
Join Date: May 2009
Location: western Clay co. Indiana
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Installed a heater valve today....
99 Super Duty 7.3- no factory heater valve.
So I went to Carquest, bought one, hooked it up, worked fine when I first started the truck to check for leaks. After I drove around for a while and got home, I realized it was allowing some water into the heater core, while it was in the "bypass" position. By the way, I bought a by-pass type, vacuum operated unit. When I took it out of the box, I blew through it to determine which holes were which, and I noticed it didn't seal very well, but thought nothing of it. So I'm thinking I'll just take it out and put some manual shut off valves in, with a bypass tube.
Question- Do you guys think the by-pass is needed? What harm would it do not to have one? Will it hurt the water pump?
Also, does the cooling system vent somehow- When I took the cap off the overflow tank, it had pressure on it. Bad cap? Or is that just how it is?