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Phantom "Check Engine" and "Overheat"

My 2001 Mitsu Montereo XLS is a great SUV...but it has a couple of problems. The Check Engine light comes on, and says the code for the air flow regulator - although all the sensors and the air flow value have been replaced. I understand that this model has some panel issues, and thought somehow this error could be part of that? The emmissons and all else check fine. It also says that it's overheating sporadically - my mechanic brother (heavy industrial Volvo, not Mitsubishi) use his temp reader, and while it was "overheating," the actual temp was normal and steady, even after it chose to "cool" back to it's normal temp on the gauge. Now, when you try to turn on the AC or heat, the fan motor will not work in positions 1,2 or 4. The AC light is engaged. When you turn it to 4 (highest) the AC light goes off, and the blower engages. Outside of shooting my beloved car - and I have to have it be dependable, it's the means of travel for myself and four children in a northern state (expecting snow, it's 4WD). Can you advise? I've paid so much money for "let's see if this works" and so far, it's only accumulating more phantom problems. btw - no real change in mileage, or preformance. It's a great car. Only recent change? Added headrest DVD's for our family vacation to see G'ma...good idea when you're driving 14 hours with little ones. It caused a fuse issue, was repaired, and went back to doing exactly what it did prior - dial says overheat, no AC blower on 2 or 3, and "check engine" is my near constant companion. Comes on about 5 minutes after they clear it. Help!

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Posted on Jan 02, 2017

  • 119 Answers

SOURCE: Code #P0171 & code #P0174

The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.

Posted on May 22, 2008

  • 1 Answer

SOURCE: overheating

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Posted on Jun 19, 2008

  • 66 Answers

SOURCE: 2006 Ford explorer/No heat /overheating

Sounds like you are either low on coolant, or a head gasket failure.

Posted on Jan 06, 2009

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SOURCE: 2001 chevy monte carlo is overheating when driving

Hi;
If your engine cools down when moving fast, you either have a problem with your water pump or your electric fans that cool off your radiator and a/c condenser. This is controlled by a temperature switch, but these fans should kick on instantly when A/C is selected.

Posted on Nov 22, 2009

  • 1 Answer

SOURCE: 2001 Mitsubishi Montero Limited. 122k miles.

2003 Mitsubishi Montero Limited. 97k miles. Temp gauge is erratic when actual temp is normal. How do I fix this?

Posted on Dec 31, 2009

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