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I have 2003 Mazda 6 with no heat. Blowera work kuat only blows out cold air ao i I replaced thermostat still no heat tho There is a small leak in radiator but will that stop the heat from working?

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  • 18 Answers

Check heater control valve.. or see if someone bypassed the heater core.. look for one hose going in the car and one coming out.. if bypassed it will be looped or plugged off...if you are not getting vacuum at the control valve it will not open....if you're control valve has a leaking diaphragm it will not open...need vacuum tester to check that...

Posted on Oct 14, 2013

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Posted on Jan 02, 2017

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SOURCE: 1999 sport 4.0 liter wrangler 6 cyl no heat

Tell the guy who fitted your radiator to finish the job, your cooling system needs bleeding

Posted on Jan 17, 2009

jackiaria
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SOURCE: No heat in 1998 Olds Intrigue (daughters car). Please help ASAP!!

It sounds like a thermostat.... $100-$150 repair shop.........$20 part if you do it yourself !
Go to an auto parts store and have them read your codes to determine why the Check Engine Light is on and to confirm any problems. Advanced Auto Parts will usually do this for free!
Did you check the fuses usually located under the dash on the drivers side or under the hood?

Posted on Jan 21, 2009

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SOURCE: 1996 Acura TL Heater blows cold air when stopped

the heater core could be clogged you might again check your coolant level just to be sure its full

Posted on Jan 24, 2009

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SOURCE: slow leak in radiator or overflow heat blowing cold when stopped

It sounds to me as though you have a thermostat valve problem in the cooling fluid cicuit. The test is to remove it, let it get to room temp. and then place in a cup of boiling hot water. It should open. If it does not, replace. They are fairly inexpensive 5-10$. If you do not know were it is follow the top hose of the rad to the engine block it will be in the housing that the hose clamps to at the block. Caution!!!! when you remove that thermo stat housing you will drip coolant. Catch it in a pail or similar. If you miss the pail, hose down the driveway or whatever because it tastes great to pets but is deadly. ( Ethylene Glycol ).

Posted on Dec 02, 2009

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SOURCE: I have a 2003 Dodge Ram 2500 4x4 with a cummins

I had a 2001 Dodge 3500 with the same issue. In my case, the "air blend door motor" failed. I had it fixed at a Dodge dealership - the motor itself was only about $125 but it cost another $900 for labor - they had to remove the dash & center dash console in order to get to the motor. It did fix the problem though.

Posted on Apr 16, 2010

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ok here we go and you aren't going to believe it...
I replaced the thermostat step one

I noticed that I had a small leak at the engine side of upper hose fixed that by taking it off and cleaning it and putting the hose back on Step two

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