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Pew pew!
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18,204 Posts
Discussion Starter · #1 ·
Here's my other issue on my truck ('01 Dodge Ram 4x4).

Say I have the A/C pointing at my face. If I'm on the freeway and give it 3/4 throttle so the load increases on the engine, the vacuum change causes my HVAC to switch to defrost.

I've checked with tech manuals and it is supposedly a common problem says to replace both check valves on the vac lines near the intake manifold.

I pulled both valves and checked them and they hold vacuum. The lines don't seem to have any leaks either.

Any help?
 

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keep your stick onthe ice
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907 Posts

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keep your stick onthe ice
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907 Posts
is there a vac res to hold vacuum to the hvac under at wot?
 

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Covered in mud...
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17,915 Posts
Hmm, my 96 ram does it also, its really annoying..

Hoping muddypaws will post some purty diagrams....

:dunie:
 
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