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andy
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103 Posts
Discussion Starter #1
does anyone know why the ac cuts out when i get on the gas? Does it loose vacuum pressure? Could use some advice it's hott here in AZ. 97 ram 1500 5.9
 

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746 Posts
Could be one of the 2 vac. check valves under the hood. There is a thread at the top of the page called "goes to defrost" that explains this valve and the problems that it causes.
 

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Woodstock
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762 Posts
From Mother Mopar;

The use of a vacuum check valve helps to maintain
the system vacuum needed to retain the selected
HVAC mode and vehicle speed control settings. On
gasoline engine models, it prevents the engine from
bleeding down system vacuum through the intake
manifold during extended heavy engine load (low
engine vacuum) operation.

On gasoline engine models, a second vacuum check
valve is installed in the accessory vacuum supply line
at the tee fitting near the dash panel in the engine compartment.
This check valve also helps to maintain the system vacuum
needed to retain the selected HVAC mode settings, but
isolates the HVAC vacuum circuit from the vehicle speed
control vacuum circuit. It prevents the vehicle speed control
servo from bleeding down the HVAC system vacuum during
extended heavy engine load operation.

The vacuum check valve cannot be repaired and, if
faulty or damaged, it must be replaced. :teacher:
 

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It is a cheap fix. Just stay away from earnhart Dodge for the part! LOL Otherwise the only trick is not breaking/cracking any of the petrified hoses/lines under the hood getting the valve out.
 
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