00 mont starts to overheat at idlebut not if heaters are on runs 165 drivingany answers?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

Check the coolant level. The 3400 engine is know to have head gasket problems. It starts out as low coolant and progress to the fluctuating temperature condition.engine coolant level is good,and no outward leaking problems,...could I possibly have a bad thermostat?cHECK TO SEE IF THE ELECTRIC FAN AT THE RADIATOR IS RUNNING
22 people found this useful

Why would your car heater overheat?

Answer . I have a 1992 Plymouth Sundance with 130000 miles. 4 cyl, 2.0L It has been well taken care of with regular maintenance between 3k to 5k intervals since I bought it

Why would a Pontiac Sunbird only blow cold air when the heater is on and the temperature gauge run super hot but the car does not overheat?

It sounds to me like the heater core is out. Have you noticed the floor wet recently? that's a sure sign of heater core issues. The other option is it will act like that if it

1997 Chevy Monte Carlo that is over heating it quit when your defroster started workin but now my heater and defroster stopped working and my car is running hot what could be the problem?

There are many reasons why an engine overheats. It can be as simple as adding coolant and water to having a cracked head or heads. You need to look at your cooling system. Che

You have to have your heater on or your car overheats what might be wrong?

It could be any number of things, but here's what to check... Make sure the radiator is full of coolant (with the engine off and ice cold, facing slightly uphill) If you

What can cause 2000 Monte Carlo to overheat?

In the general case, cars overheat because of a bad thermostat, low coolant level, blockage in the coolant system, insufficient antifreeze percentage, fan blockage, or water p

What would cause 00 jetta 1.8T to overheat?

Probably any normal thing like not enough Radiator Fluid or something is wrong with your radiator or a head gasket leak could cause the radiator fluid loss. Does this Help?
In Heater Cores and Blower Fans

Ok you have a 00 Montana 3400 you have replaced the thermostat 2xs water pump 2xs front heater core radiator intake gastket and flushed the rear heater core and it still overheats?

I don't know how old this question is, but we had a similar problem, it turned out a head gasket was leaking. We've had it replaced and the van has been driven about 500 miles
In Chevy Monte Carlo

What causes a 2002 Monte Carlo to overheat?

In the general case, cars overheat because of a bad thermostat, low coolant level, blockage in the coolant system, insufficient antifreeze percentage, fan blockage, or water p
In Cars & Vehicles

Have to run the heater so it don't overheat?

Don't know the year, make or model of your vehicle but start with replacing the thermostat then check to be sure the fan clutch is working properly and that the fan shroud is