Quote:
Originally Posted by ls1nova71
Why do you care if it opens when the truck isnt running? When you start the truck it will shut off again, so it shouldn't affect the performance of the A/C. That's how the factory ones were too, only they were all vacuum operated.
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The valve is servo controlled and it's slow to close. When I drive the truck somewhere and stop for a short period of time the heater core will fill with hot water on startup. Due to the design of the air box, a hot heater core has to be cooled down for the AC to start blowing cold. I have never been a fan of the valve as it is, I think it should be designed to be normally closed not normally open. I also suspect that it may be allowing some water through. I have a 16lb radiator cap, so maybe the extra pressure is forcing water past the valve.
What I am not sure of is how the LS engine should operate. I read a few threads that suggested creating a bypass rather that completely blocking the heater hoses.