2001 Ram 2500 A/C - sometimes blows hot - sometimes cold - DODGE RAM FORUM - Ram Forums & Owners Club! - Ram Truck Forum
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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.

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Old 06-14-2011, 02:32 PM
hammerheadn hammerheadn is offline
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Join Date: Dec 2010
Age: 63
Posts: 2
Gender: Male
Vehicle: 2001 Dodge Ram 2500
Color: white
Engine: 2001-2003 359ci (5.9L HO) Cummins ISB 24-Valve Diesel I6 245hp 505lb/ft (6-Speed Manual)
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Default 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
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Old 06-14-2011, 06:19 PM
dsol dsol is offline
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Join Date: Apr 2011
Location: Indiana
Age: 26
Posts: 40
Gender: Male
Vehicle: 96 dodge ram sport
Trim Level: sport
Color: red
Engine: 1994-1997 360ci (5.9L) Magnum V8 230hp
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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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