Hello all. I am working on my Grandmothers 2001 Tracker ZR and the problem she is having is that there is no heat coming out of the vents and defroster unless the RPMS are above 2000 when selector is on outside air. The engine temperature is operating within normal ranges. Did not check it on recirculate to see if it functions properly. Any ideas wold be great. Thanks

 

Have you looked at the cabin air filters? There are two of them under the passenger side dashboard area.

 

No I have not the air flow from the fan motor is good. I have seen when they are plugged you get no air flow. But will check thanks for the help

 

How does the coolant look if it has rust or corrosion it could possibly be a clogged heater core take a hose and some cleaner to try to clear it out

 

Coolant looks good flushed heater core still no heat unless going 35 mph or rpms above 2000

 

I assume coolant level is up? My sub did this when the water pump was leaking and the coolant level dropped a bit. You could hear fluid turbulence in the heater core. Wonder if you have air trapped in the system?