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-   -   2001 Ram 2500 A/C - sometimes blows hot - sometimes cold (http://www.ramforumz.com/showthread.php?t=84963)

hammerheadn 06-14-2011 02:32 PM

2001 Ram 2500 A/C - sometimes blows hot - sometimes cold
 
I can't figure this problem out!!!!! Any input would be appreciated

In late evenings or night when sun & ambient temp down a/c works 100%.

Mornings drive to work park start up at lunch turn a/c on -- idle 45 mins. -- blows cold air the entire time.

************************** start up at lunch turn a/c on -- drive 2 miles down the road blows hot air

When driving and blowing hot air turn a/c off for approx. 5 minutes turn a/c back on and will blow cold air a couple of minutes then blows hot again.

Under the hood**
-- Compressor sound and appears to be cycling just fine.
-- Condenser is free of bugs and fins are 90% good.
-- Accumulator is never frozen up.
-- Engine never overheats.

In the cab ** No wet carpet below HVAC evaporator area to indicate evaporator freezing up or the evaporator drain is blocked.

Under the truck** After shutting truck off occasionally notice puddle of water underneath indicating that evaporator drain is not blocked

Have not checked ** Freon level (High or Low side pressure) -- that the a/c works 100% at times would indicate that the pressure and freon level is good.

Have recently replaced ** (not for this problem) 1) A/C and Heater Control Unit
2) Blower Motor

Need to replace ** (only have high speed on blower) Blower Motor Resistor

dsol 06-14-2011 06:19 PM

sounds like the valve that crontrols the coolant that goes to the heater core isnt shutting all the way or possibly vibrating open. or even just be a lose blend door that isnt directing air flow properly


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