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99 300m heater blown cool air - Cars & Trucks

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  • Terry Murphy Nov 01, 2012

    what type and model of car Vanessa?

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Air Temperature Control Blend Door Failure No Heat

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Posted on Nov 01, 2012

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1 Answer

Engine is showing normal operating temp. Why is there no hot air from heater?


Make sure no fuses are blown. It could be the actuating motor that controls the door the mixes the warm and cool air. This is usually located next to the heater core.

Nov 26, 2015 | 2004 Nissan Titan

2 Answers

Overheats, smoke from TOP of engine, blows cold air from heater


suspect a blown hose, heater hose probably behind the engine. now when you fill it back up you have to bleed the air out of the system and the bleeder valve is usually a brass screw close to the area of the thermostat... find the leak first and foremost or catastrophic engine damage can and will occur

Dec 30, 2013 | 2001 Chevrolet Cavalier

1 Answer

Getting air in my water going to the heater on 1996 mittsubchi


does the engine run smoothly or do you detect a slight miss in it..if air is getting in to the cooling system its normally a blown head gasket..or cracked housing somewhere..

Dec 08, 2013 | 1996 Mitsubishi Montero

1 Answer

My car is overheating and the heater is not working. I've been told it's a blown head gasket. I've also been told that I need to bleed my cooling system. So my question is, where is the co


If you have a blown head gasket, surely you will overheat because some hot combustion gases are entering your cooling system. No way you can remedy it by bleeding the system. Bleeding the system is just removing the trapped air in it. Running the engine with out the radiator cap will do the trick.

Oct 23, 2012 | 2005 Nissan Sentra

1 Answer

2003 kia optima heater wont blow hot air


Hi James,

First, I guess you realize that the heater is part of your engine cooling system. Then it also has its own parts inside the vehicle that have absolutely nothing to do with the engine cooling system.

The trick to getting your heater working is to first determine which part of the heater system has the problem.
First, you need to verify proper engine cooling system operation. There is more to this than just replacing a thermostat. If you have a problem like a blown head gasket, you r heater will not work. What SHOULD be done is to operate the engine while watching the computer data for the engine coolant temperature sensor (ECT). Doing This, you can verify that the engine is warming up to operating temperature. You can also verify that the thermostat is opening at the correct temperature. Then take an infrared thermometer and take a manual reading from the engine near the temperature sensor. The reading you get from the thermometer should be within about 5 degrees of the reading that the computer is getting from the ECT. The engine cooling fans should come on between 220 and 228 Deg. F. When they do come on, the air that is blowing through the radiator should be HOT. If it is not, this is an indication that the radiator is stopped up, the water pump is not pumping correctly, or there is a blown head gasket that is filling your cooling system with combustion gasses. This can be done with just the thermometer, but it is best to also verify the ECT computer data.

If all of this is working properly, then it is time to look INSIDE the car for the problem. The blend-air door in your A/C-heater housing may not be working. When you switch the temperature control inside the car, you should be able to HEAR a change in the air flow. This applies to ALL vehicles, whether they are equipped with cable, vacuum, or electronically controlled blend air doors. If you cannot hear a difference in the sound of the air moving through the A/C-Heater housing, then chances are pretty good that the problem is with your blend-air door. If this seems to be the problem, let me know and I can give you further instructions on how to check this and/or repair the problem.

P.S. Just thought I'd mention that a pretty good infrared thermometer can be purchased at any parts store for around $40.....This is a very good investment because you can use it for many other things and is a lot cheaper than an hour of diagnostic time at most repair shops.

Dec 05, 2011 | 2003 Kia Optima

1 Answer

The heater blows cool air not warm air


First check and make sure that your coolant(antifreeze) level is full, the hot coolant runs through the heater core and than air is blown over the heater core heating the air for the heater. if the coolant is full you than need to check the thermostat and make sure it is functioning properly. finally if both of those are not the problem it is possible that your heater core is bad, however if the heater core is bad you will notice coolant leaking onto the passenger side floor. so if the floor is dry I would say the heater core is not the problem

Mar 27, 2011 | Nissan Quest Cars & Trucks

1 Answer

Got ac but no heat.fan works fine and no fuses blown.


Check heater valve selonoid by removing electrical connection and then remove the 2 lower hoses.Then use a garden hose and water in one of the bottom hose connection.If water comes out the other end, it's good. If good flush out heater core.Make sure the engine is cool and not hot before opening up cooling system. Had same problem in 95 xj12 there was air in the heater core.they call it air lock.

Dec 14, 2010 | 1995 Jaguar XJ6

1 Answer

1999 pontiac montana 3.4 heat ing problums


sounds like a blown head gasket to me.  Does the coolant smell like exhaust?

Mar 31, 2009 | 2001 Pontiac Montana

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