Question about 1999 Mitsubishi Diamante

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The heater on my 1999 Mitsubishi Diamante will not blow warm or hot air

I have the Temp Control as high as it will go however the air only blows cool fresh air. The air does not get warm at all

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  • Mitsubishi Master
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Coolant low or heat control valve stuck shut..

Posted on Dec 31, 2013

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  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: Mitsubishi Eclipse Ac and heater problem

cold air on passenger side of car and warm on drivers, why

Posted on Oct 14, 2009

  • 356 Answers

SOURCE: 2002 eclipse heater blows cool air

Check your antifreeze level and if low then add antifreeze until the radiator is full and the overflow tank is up to the correct level. that should solve your problem. If it isn't that, chances are your thermostat could be stuck open which isn't allowing the coolant to warm up properly.

Good Luck

Posted on Dec 19, 2009

  • 10 Answers

SOURCE: re: 1998 Mitsubishi Diamante Air Conditioner problem

check the refrigerant it might have 2 be recharged

Posted on Feb 24, 2010

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Passenger side doesn't blow warm air no matter what temp is set on drivers side seems to work just fine


the fresh air vent is stuck open r the hose is off on back of vent vent should pop out to reconect

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1998 Toyota Camry 4 cyl.only blows warm air from heater when car is unning for say ten min. When I start driving the temp gage goes down to cold and blows cool air, no heat. I changed thermostat and...


Your radiator cooling fan will only come on when the engine temp has reached the point where it needs to have air forced through the radiator and thus bring engine heat back down to safe operating range. If your heater is not working check to make sure the fresh air vents aren't stuck open (are the controls stiff or not going all the way across?) check also that the heater shutoff valve lever which is usually situated on the firewall at the rear of the engine and can be found easily by tracing the hoses back from the thermostat housing aren't bent and/or seized up.

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'04 Chev Silverado 1/2ton Heater only blows warm air when motor is at high RPM. When I stop and its just idling, it blows cool air.


It sounds like your thermostat may be stuck open, with the engine working hard the temperature of the engine comes up thus the warm air, but just at an idle the thermostat is letting the coolant circulate and not holding it their until it reaches a warm enough temp. You are most likely going to need to change the thermostat.

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Heater blows cool air instead of warm air


check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.

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Warm heat not hot


Check antifreeze level, if it is low coolant may not flow through heater core. If coolant level is ok feel the heater hose with engine running at normal operating temp and heat on high, if one hose is much cooler than the other you have a bad heat control valve or a pluged heater core.

Oct 15, 2009 | Pontiac Grand Am Cars & Trucks

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Driver's side air blowing warm, won't change


Sounds like there is a crack in the vent that leads to the drivers side, and hot air from the engine is leaking through.

Aug 29, 2009 | 2003 Hummer H2

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2004 Odyssey, heat and A/C do not work unless van in motion


Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.

To see if the air mix control motor is bad, you need to retrieve your Diagnostic trouble codes (DTC's) from the heater control panel. To run the diagnostic function, do the following:
1. Turn the ignition switch ON (II).
2. Turn the fan switch OFF.
3. Press the recirc control button to select Recirc (recirc light on.)
4. Press and hold the recirc button to select Fresh (recirc light off) and continue to hold the button down until the recirc light comes on for two seconds and then goes off.
5. If the system is okay, the recirc light stays off.
6. If there is a problem, the recirc light blinks the DTC to indicate the trouble. One blink=a problem in the air mix control motor circuit. Two blinks=problem in the mode control motor circuit
Three blinks=problem in evaporator temp sensor circuit.
7. Turn the ignition switch off to cancel the self diagnosis function. Run the diagnostic again after repairs are complete.

Note: the air mix control motor has a rod which connects to a plastic link. The link controls the mix doors and also connects to the heater control water valve via a cable. The air mix motor may check okay, but if the link is broken then you will still have problems. the motor is on the bottom of the heater unit in the front passenger's foot well.

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Cannot shut off heat


probably the heater control valve in the engine compartment usually mounted to one of the heater hose , the valve is broken internally and allowing hot water to constantly flow into the heater core, i would first check this valve by replacing it or by-passing it.

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