1992 Mazda MPV

Heater problem
1992 Mazda MPV 6 cyl Two Wheel Drive Automatic 190000 miles

Heater does not blow warm air for a long time, sometimes 30 -45 minutes after starting to drive. Engine temperature gauge goes to normal level and doesn't overheat, no weird smell or smoke or anything. Will eventually start to blow warmish air after have been driving around for a while. Is this the thermostat or is the heater core going out. No leaks in or under the car.
S keener
December 12, 2007.

You need to flush heater core
when cool remove two heater hoses
run water throw one out the other try to use comp, air if avai.

Dec 20, 2007.