Quote:
Originally Posted by Andy4639
If you are wanting a 100% AC to work good then I would leave it. That ensures the hot water doesn't come into the cab while the AC is on. Most people put it in the other line though. If the vacuum operated valve leaks hot water by then your AC will never get as cold as it should inside the cab. Putting it in the other line makes sure it doesn't circulate at all through the heater core.
If you do decide to take it out a simple test is to feel the lower part of the interior heater box to see if it is warm when the AC is on and the truck is sitting still. If it is some what warm then you have water leaking by the vacuum valve and you will not get the cab as cool as it could be.
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Or to test: when the heat is off, the hose on one side (downstream side) of the factory valve should be cool.