Question about 2003 Mitsubishi Galant

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No heat but heater coil is hot and fans are running

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Check rad fluid

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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Why does radiator fan work when air is on but not when heater is on?


Have you waited long enough?
Sometimes it can take 5 -10 minutes before it turns on while using heater.

Oct 22, 2015 | Toyota RAV4 Cars & Trucks

1 Answer

Ac heat wont bturn on


1: engine hot. 180F or more?
2: fan blows on high?
3: got heat at any vent?
AC dont make heat, only the heater coil core, does that.
it only takes 2 things.
engine coolant hot.
and air flow across said core,
both are easy to check, ask.

Mar 17, 2014 | Jeep Cars & Trucks

1 Answer

No heat but fan works


could be a thermastat or your heater coil; try starting your vehicle aand putting ani freeze while engine is running but still relativley cool, sounds to me there isnt any fluid getting through to the heater coil

Jan 03, 2013 | 1992 Ford Taurus

3 Answers

How do I check to see if the heater coil is plugged


The fan is usually the problem - does the fan run? If the fan is good, remove the fan and use a mirror and flashlight to inspect the coil. It would be unlikely that the coil is completely plugged but it can happen.

Dec 27, 2012 | 2002 Lexus IS 300

1 Answer

The heater in my 2008 pontiac G6 doesn't work how do i fix it


Is the fan blowing for the vents? If not the problem is a fan issue which is much more likely. The hot water usually goes through the heater core all the time and the only reason you get heat when called for is that air is directed across the fins and coils where your engine coolant is going through. Of course the heat does not come on until the engine has heat built up in it say after about 7 minutes of run time depending on ambient temperature.

Oct 01, 2012 | 2008 Pontiac G6 GT

1 Answer

No Heat, fan works engine is at temp.


Check to see if both heater hoses are hot when the engine has heated up and the heater is running.

You have 2 possibilities. One is that water valve is not opening and the heater core is cold, the second possibility is that the heater core is hot and the ductwork under the dash is not switching the flaps to give heat.

If both heater hoses are hot it means the heater core is hot and the interior ductwork is not channeling heat. You would then need to replace a movement valve or motor to switch the flaps in the ductwork.

Sometimes with the high priced options, there are self-diagnostics in the control panel of the heater. You would need someone to initiate the sequence and let the self-diagnostics pinpoint the bad part. Otherwise you need to dive under the dash and troubleshoot.

Feb 12, 2012 | 1995 Buick Regal

1 Answer

Having trouble with the heater in my 2006 Dodge Grand Caravan. When the car is driving around the neighborhood or stopped at an intersection, only cold air blows. Only with extended constant acceleration,...


Yes . Your heater is actually not an Electrical Heater or a Separate Heating system . Actually if uses the same Radiator Line . When Radiator is heated up it is cooled down with radiator Fan and coolant . But when you use the heater function , this hot fluid is passed through a heating coil tube and blower fan is used to take that heat inside the car .
So I think now you understand , why you are not heated up in a short run . You really need to make the Engine + Radiator Warmer ( that is natuarlly happened when you run more) to get Warm air inside.
Please rate my answer fairly and Support me With Regards and Season's Greetings Deepak Richard

Dec 14, 2010 | 2006 Dodge Grand Caravan

1 Answer

97 Ford Escort- no heat/ac/defrost or vent fan. Nothing will turn on. Checked all the fuses including the ones under the hood. Worked perfect one day then nothing the next. What could be the problem and...


OK the HVAC system has several components that make it work.
The actual heat is the hot coolany from your engine that flows though a heater core.
The blower fan operates on 12 volts, and runs through a resistor to apply your fan speeds.
The selector to run heat, defrost, ect. runs off of the vehicles engine vacuum, and opens and closes diverter doors.
The A/C uses a pump at the engine, a condersor coil and several switches.
I would look to the HVAC switch controler. Check for voltage there.
Please let me know.

Feb 10, 2010 | 1997 Ford Escort

1 Answer

I have no heat in my 2000 expedition. Is it the heating coil? Or could there be another problem?


Is the blower fan for the heater going on, but only cold air? If the fan is working, but no hot air situation, 1st check the coolant level, if it's low, the coolant won't flow thru the heater core, so little or no heat. If level is ok, what does the engine temp gauge indicate? Is the engine running normal temp range, cold, hot? Let me know answers to these questions so I can help u.

Dec 08, 2008 | 2000 Ford Expedition

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