1998 Dodge Ram heater

Tiny
CHXXDY
  • MEMBER
  • 1998 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have a 1998 dodge 1500 5.2 L when the truck get up to heat the heater only blows warm air and some times when you switch from vent to floor and back to vent it stays on the floor I have changed the thermostat the coolent and the blower works good just no hot air
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Monday, December 15th, 2008 AT 9:51 PM

1 Reply

Tiny
BMRFIXIT
  • EXPERT
I have seen a lot of these most cases heater core is clogged and need to be flushed
in some I had to flush it few times

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 5:51 AM

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