So the engine coolant steady>? this 1s. never last. !!!!
say 200F driving.>
any scan tool can scan the ECT and you and watch it.
if not over 180F holding then the thermostat is bad, (summer answer)
SOURCE: grand cherokee heater blows cold air
Check the coolant level, sounds like you may be slightly low....Be sure heater is on high when filling the system....Look for any air bleeds...
SOURCE: My 2005 Jeep Liberty will not blow heat through
heater valve if you have 1 ,or temp control actuator which is under the dash and takes hours to replace!
SOURCE: 95 Jeep Grand Cherokee....I have no hot air. of
Your heater core could be plugged with dust if this problem came up slowly I would suspect that. Another thing that cold be wrong is a trap door is not opening these are operated by cables vacuum or stepper motors. Confirm that something happens when you move from cold to hot on the control.
SOURCE: 2003 jeep grand cherokee heater problem
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
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