Question about 2003 Mitsubishi Lancer

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2003 lancer oz No heat at idle

I have no heat at idle unless you increase the rpms. But when the rpms go down to normal the air gets cool. I replaced thermostat, water pump& pushed water through the heater core to make sure it flows good and everything seems good. But when my car is at idle its about 700 to 800 rpms.

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  • sub91legacy Feb 05, 2009

    the coolant level is full



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Make sure the coolant level is all the way full

Posted on Feb 05, 2009


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Land rover, continued they did the heat sensor test on radiator it was good it could sit all day idle and not overheat it won't blow hot air unless u hold the rpms 1500 for 10 sec the heat will start...

sounds like air trapped in the cooling system. park it on an uphill slant, open the radiator cap...cold of course and let it heat up. replace any coolant that burps out of it

May 25, 2017 | Cars & Trucks

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I have a Nissan Murano 2003. The cvt transmission was replaced 4 years ago. Now when Im driving up hills,the rpms get stuck at 4.5 and the sounds like my car is growling. Heats the engine up fast but the...

The engine and the Trans are in timing with each other from the factory...If the RPMs are revving up but the TRANS isn't keeping up with the Engine The problem sounds to be in the trans...Unless your calipers are sticking and holding you back....!?...A Throttle position Sensor can give you problems because It controls the throttle but normally if it is faulty it should run rough at any level....Same goes for the Idle Air Control valve....A fault in either of these components will produce abnormal RPMs and a rough running engine....Early signs of a clogged fuel filter will stall you while going up a hill also.....Of course the engine will get a temperature increase because it is being overworked....It may not be as hot as you think considering the gauge reading you described...You would have to use a handheld thermometer for a positive engine degree reading....However if it is evidently boiling hot and gauge reads normal it sounds like a faulty sensor in which case is a different problem....Make sure coolant is full to be safe......m..

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1 Answer

Losing heat during idling

Check coolant level. As you increase rpms, coolant circulation increases, and vise versa.

Nov 12, 2013 | 2010 Ford Escape XLT

1 Answer

2003 Lancer OZ Rally - Erratic Idle while sitting. Acceleration and normal driving is fine but when I stop for more than 10 seconds it bounces between 400 and 1000 rpms. What could be wrong?

You may be having a problem with your IACV idle air control valve. It is located on your Throttle body(follow the tube from your air cleaner to the throttle body) It will be on the the right below the tube. It is held on by three screws. It runs $430 at the dealer. I got one off of a junkyard throttle body for $30 and recycled the rest of the throttle body.

Sep 16, 2010 | 2003 Mitsubishi Lancer

1 Answer

2003 Lancer OZ Can't turn the knob from AC to heat. Help!!

The wire has been bent. If you work the switch twisting gently you can actually get it to switch over from cool to heat. The only way to fix it is to replace the wires for the coolant switch. Rest assured you are not the only one with this problem. Just don't force it. Gently turn back and forth till it moves over.

Sep 03, 2010 | 2002 Mitsubishi Lancer

1 Answer

Air conditioning compressor will not kick in,

If it is above 100PSI, you are over charged. Any thing under, should be normal to low. You probably need to get it checked by a professional to make sure it has the correct charge, and the compressor is getting power when the switch is turned on.

Jul 14, 2009 | 2003 Mitsubishi Lancer

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i just fixed mine.. take out your idle air intake valve, clean it all out. mine had the same issue. foreinstance in neutral my rpms were higher then drive.
i also have a 2003 lancer black

Jun 10, 2009 | 2003 Mitsubishi Lancer

1 Answer

The engine rpm's increase when the engine gets warm.

spray a samll amount of either near each vacum line connection if the rpms go up theres your leak!!

May 30, 2009 | 2005 Mitsubishi Lancer

3 Answers

No Heat in 99 Taurus

Just finished fixing my daughters 1999 taurus heat. It would blow warm only when running down the road. At idle it blew cold. I started with replacing thermostat, and water pump because they are the easier fix. Still did not help. Then I replaced the heater core. A daunting job but not that hard to move the dash slighly out of the way to replace. There is a good write up at After that, heat was better but at idle, it would still blow cool sometimes. Researched and found answer. Park car on the steepest hill you can find with front of car up. Start car and take off reservoir cap. Let car warm up and keep rpms about 1500. After a while the fluid will come running out of the car and all over the place but it will bring air bubbles with it. Reduce rpm, add more fluid and repeat about 3 times. It will make a mess but after that, the heater works perfectly. We get heat long before the temp gage indicates any and it never blows cold unless you lower the temp.

Nov 21, 2008 | 1999 Ford Taurus

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