2002 Dodge Ram heater

Tiny
LILJJ1650
  • MEMBER
  • 2002 DODGE RAM
  • V8
  • 4WD
  • MANUAL
  • 66,589 MILES
My 2002 dodge ram 1500 heater blows out cold air unless the engine is reved up or the truck is moving other than that it blows out cold air when it is idiling
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Wednesday, December 10th, 2008 AT 5:44 PM

2 Replies

Tiny
HIGHROLLER
  • MEMBER
I have a 2000 Ram with about the same miles and I am having the exact same issue. I check the coolant level and the radiator cap is brand new. I was going to replace the thermostat.
Hopefully that works. It's -40 and COOOOOLLLDDDDD.
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Tuesday, December 16th, 2008 AT 1:44 AM
Tiny
BMRFIXIT
  • EXPERT
Check WATER PUMP
Check coolant level

most cases its the heater core

Check heater core hoses if both are hot, if not the heater core need to be flushed as a 1st step
these are the steps
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
reconnect hoses
top off coolant system
good luck
let me know
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Tuesday, December 16th, 2008 AT 5:54 AM

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