Question about 2002 Mazda Millenia

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Heater stopped working

The heater wont work and with it on the cooling fan wont kick in, but if I put it on a/c the cooling fan works but the heater still wont work?

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I have a 1998 Pontiac trans-am and I replaced heater core and heater still doesnt work

Posted on Jan 23, 2015

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The heater core has gone out and will need to be replaced

Posted on Dec 07, 2008

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My heat works on all settings whenever it comes on, but it can take up to an hour for the fan to kick in.


If the engine itself is running on the hot side, that's could be a thermostat/ heater control valve. If the engine itself is running up to par (cooling system, fans etc) sounds like a heater control valve issue.) Inside fan works well, no odd vent smell (rotten eggs). Heater control valve. Good luck Frank M

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Make sure your fan is working properly. When you turn on the heater you are forcing the fan to cool the radiator. It may not be turning on automatically when it is supposed to. Let us know if this helps..

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cooling fan or heater fan? if its cooling fan then the coolant temp sensor is bad

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Changed the thermostate and drained the radiatior and put new fluids in brought car to running temp but heater still wont blow hot are


Feel of the heater hoses going to the heater core,if they are not getting hot,then remove the heater hoses and flush the heater core out with a water hose.Also be sure to bleed all the air out of the cooling system.

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Keeps over heating i have new radator old one blew out this seems to be doing same i have buy past heater core and removed therm stat,what is wrong???


sounds like a head gasket leak, you can buy a kit at your local auto parts store , that you can stick on your radiator and will change color if exhaust gasses are present in the cooling system. alumiseal does a great job of sealing leaks on the straight 6 motors on these models

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1 Answer

Heater not putting out heat


Sounds like you may have a head gasket going. Is it running low on coolant? Or did it? Make sure it is topped off and the heater core is full. Let it run and see if it over heats and you have lost fluid. If so I would have a pressure test done on the motor to see if the cylinders bleed down. I hope it is something like the heater core not being full. I wish you luck.

Mar 09, 2009 | 1998 Subaru Forester

1 Answer

H/c fan stopped woking


loose contact on heater matrix and try swoping the switch on the door for the window

Mar 03, 2009 | 1997 Chevrolet Astro

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Heater wont work a fuse maybe? some how I doubt it. the rear window heater works. fan dead perhaps? no fan at all. not sure about heat.


Hi: Sounds like a possible heater resistor problem. First check to see if heater fan working, unplug heater under hood and put 12 volts to it from the battery with a wire (single black wire running to back of fan). If works then problem probably the resistor which is located on the fan housing under the hood to the right of the fan. The resistor has wires to it running from the heater fan, 2 - 7mm screws holding resistor in place, check resistor to see if any of the 3 elements are melted off, if so replace. Note: Rear window defrost has nothing to do with heater fan. Hope this helps...

Feb 26, 2009 | 2002 Chevrolet Blazer

1 Answer

Heater comes on and go off when it wants to.


What you're likely referring to is the blowing air starts and stops erratically. Since the heater uses heat circulated from the engine, if the air is constant and the heat comes in and out then that's a different issue.
Firstly, if the airflow starts and stops, you'll find a loose connection between the the fan switch and the blower itself. If the connections are sound, then look for a loose ground connection to the blower. If all electrical connections are good, and it still starts and stops erratcially, then it's time for a replacement blower.
Secondly, If the air is constant and the heat comes in and out, the the options are a faulty water pump or partial blockage in the colling system or heater core. If the water pump is failing and working erratically, then when the heat dissipates in the cabin airflow (it has used all the heat in the heater core and no circulation to replace the cooled water with hot water) the dash temp gauge should start to climb, indicating that the coolant is no longer circulating, the heat has left the heater core but the engine is not being cooled. You'll need to replace the water pump. If this is the case, take care of this ASAP as you run the risk of a an engine overheat.
If the dash temp gauge looks normal, then you're likely looking at a partial obstruction in either the cooling system or the heater core that blocks the flow and then works its way loose erratically. Limescale and crud buildup in your cooling system (especially in a 15-ys-old car) can cause this when flakes of buildup brake loose from the walls of the larger channels and get caught up in the smaller ones. Your local parts store will have additives to clean out the cooling system, but if they don't work (they can only do so much) then you're looking at a professional cooling system flush. If the issue persists after that then you're likely looking at a heater core replacement.
Also check to see that your a/c is not kicking in erratically. It shouldn't completely cool down the full-hot airflow, but it will cool it. You can tell if the a/c unit is kicking in as you'll hear the compressor clutch kick in and the engine revs/sound will change under the load. If this is the case look for a short in the a/c wiring.
Hope this helps, and please rate my answer.

Dec 31, 2008 | 1994 Geo Tracker

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