Not blowing out hot air.
SOURCE: heater doesn't work
Sounds like the heater core is stopped up. Try removing the heater hoses and backflushing the core.If this doesn't work replace the core.
SOURCE: 2002 mercury sable heater wont get hot
you have a broken or stuck temp blend door in the heater case. or the servo motor is broken. this sits on top of the heater case
SOURCE: heater doesn't work
This happens ALL THE TIME!! Heater core is likely plugged with rust, yes. but a garden hose fix will NOT last. and the reserve probably IS cracked on bottom, as most are.They are relatively cheap from Ford, though. Have a REPUTABLE radiator shop do a Genuine Power Flush to the entire cooling system (not an automated fluid exchange many shops claim to be a "flush") and THEN have them unplug the heater in a similar fasion. Now is the time to replace the surge tank (old one is packed with rusty sediment that is usually partially plugging the cracks in it, and not very cost effective to clean anyway). On older, very rusty 2 valve 3.0 systems only other issues are the rear of timing cover gasket often leaks a little, and the water pump impellers can become eroded away (from rust) and water flow suffers. So... watch for residue or dripping from behind water pump. If minimal, a mild leak sealant added to a properly cleaned system with refill and tightening the bolts near leak will do the trick--otherwise timing cover gasket and pump replacement is needed.
SOURCE: 2000 MERCURY SABLE
My 2000 Sable starts blowing hot air about every 6 months. I mean like an oven. All I do is disconnect the battery negative terminal for about 5 minutes. After I re-connect the problem is solved. This solves many problems on this car, it just needs a re-boot. It must be powered by Microsoft (ha ha). Good luck. ps my auto headlamps never did work right either. Dave.
SOURCE: AC blows hot air but AC compressor works
if the compressor works and your freon is charged it may be the blower flapper door....disconnect battery for 10 minutes and then re-connect to reset the electronics that control the flapper
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