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Does the heater coil have a fuse that operates it ?

It starts to blow heat out but turns cool quickly

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I know of 2 things that can contribute to this problem; first and by far most common, check to see if the level of antifreeze/coolant is up to operating level. If its too low it will not reach the heater core to be able to dissipate the heat from it.
Second, the heater core (or connectng hoses to it) are clogged and would nead a complete flushing of the system. Rare, but it does happen in older vehicles.

Posted on Jan 01, 2013

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It sounds like the heater (which is hot water from the engine not electric) is not receiving hot water on a regular basis from the two heater hoses that go into the firewall. There is a mechanical valve that needs to be checked. While you have the hood up, ask someone else to move the temperature lever back and forth (or up and down) while you look for the movement of the valve on the hose. If it doesn't seem to be moving, there is a stiff wire coming out of a hole in a wire wound cable that should be moving. What it pushes is the valve lever. Have the person put the lever in the coldest position and you tighten the holding screw on the lever that squeezes the wire. OK?

Posted on Jan 01, 2013


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SOURCE: heater does not blow hot air, just cool air

You can put a higher temp thermostat and that should help, but it should at least have 170 degree air right now if it was working right. There are two other things you might check for, the diverter door make some sound when you switch from heat to cool and back, I can't tell you for sure if it is a manual, vacumn or electric but that would definitely cause it to blow cold air. There is also a valve which cuts off circulation to the heater core when your not using it. This valve will be in line with the heater hoses going to your heater core. I have seen some that were actually part of the heater core box. I feel pretty sure one of these will be your problem. Also if your car is low on coolant it would not heat properly. Hope this can help you!

Posted on Dec 15, 2008

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SOURCE: Heater blows cool air & never heats up.

I changed the thermostat. It works like a charm now!!

Posted on Dec 17, 2008

  • 46 Answers

SOURCE: How do you relace a heater coil in 2006 pontiac grand prix?

I don't want to over step my knowledge but you car is only 3 or 4 years old. I don't think your heater core is bad, unless it is leaking, Sounds like you have a blend door problem in the HVAC system. This door is actuated by a servo motor switching from hot side to cold side. This little servo can go bad and need replacing. Just make sure you don't have any bubbles in the coolant system first as long as you havent done any thing with the coolant system you souldn't have any air in the system Hope this helps you. Please rate my solution for you thank you

Posted on Jan 19, 2009

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In the fan circuit...You have a temp switch screwed on the radiator, a fuze and a relay in the fuze box plus a fan.  Swap the relay with another relay, replace the fuze.  The other fan should come on when the a/c is turned on.  If you fix the fans and it still overheats, you may have a BLOWN HEAD GASKET.  ALSO ARE YOU BLEEDING THE AIR FROM THE SYSTEM?  DO YOU SMELL EXHAUST IN THE COOLANT?   

Posted on Mar 12, 2009

  • 6674 Answers

SOURCE: I have a problem with the heat in my 99 4 runner.

When was last flush and thermostat replaced? Also, it may sound crazy but, when I have a partially clogged heater core, which I suspect you do, I usually will disconnect the hose at the heater core, and connect a drill operated pump from hardware store (about $10) to the heater core, and circulate C.L.R through it before putting it all back together. I usually set it up to pump through the core and back into a pail or similar, and then reverse the hoses to allow flow opposite way as well, then I plug lower inlet to core, and fill with C.L.R, and let it sit overnight if I have time, just to clean out as much calcium clogged up in there as I can. Saved me replacing 2 or 3 heater cores so far, that had little or no heat at idle, prior to cleaning, but had good heat after.

Posted on Dec 22, 2009

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