At the in-laws for Thanksgiving and father-in-law's 98 Grand Caravan with 276k is having trouble with the heater.
Symptoms: will not blow heat until quite a ways down the road, long after the engine temperature has come up.
Blows cool or only luke-warm air at idle once warmed up, as soon as you drive or rev the engine it will heat again.
Coolant is full, no overheating issues and no leaks that I can see. When you move the dual temp controls back and forth you can hear the changes from the blend doors and it will switch from cold to hot air just fine (when driving).
Any ideas as to what could be causing the long wait for heat and why it goes cool when idling?
I am thinking maybe the water pump is on the way out...
Symptoms: will not blow heat until quite a ways down the road, long after the engine temperature has come up.
Blows cool or only luke-warm air at idle once warmed up, as soon as you drive or rev the engine it will heat again.
Coolant is full, no overheating issues and no leaks that I can see. When you move the dual temp controls back and forth you can hear the changes from the blend doors and it will switch from cold to hot air just fine (when driving).
Any ideas as to what could be causing the long wait for heat and why it goes cool when idling?
I am thinking maybe the water pump is on the way out...