I have a 2000 Nissan Xterra. While driving with a/c on, the temperature gauge stays at the halfway mark, but if I park for only a minute with the a/c running the gauge moves VERY quickly upward to almost the danger zone.
Question is, is there not a separate fan for the air conditioner - not the fan that blows the cool air - but a fan that aids in cooling what's under the hood?
If so, may I ask what it's called so that I will know what the heck I'm looking for on the Internet. Typing in "fan" along with "air conditioner" only brings back results for the fan blowing the cool air inside the cabin.
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I'll start with the most common cause.
Check the radiator cooling fan to see if it is functioning correctly.
It is turned on by a sensor that screws into the engine block, and there is also a relay in the under-hood electrical box.
Finally, the electric fan is mounted at the radiator.
There should be 2 fans there, one of them is for engine cooling, one for Air Conditioner cooling.
The engine cooling fan should come on anytime the engine temperature exceeds the setting of the screw-in-the-block sensor.
If it does not, it could be the sensor, the relay, or the cooling fan itself that has failed.
If you live in an area of the country that is prone to extreme cold temperature, "road salt" can contribute to fan failure.
If all these check OK, write us back and tell us, we'll go to step # 2.
God bless your efforts.
our car will do this, if the car is in idle and not reving or in drive the clutch will disingage the ac fan as not to burn it out.....in idle it gets very hot....and usually the air comming across the coils helps to keep the systems cooler....it's a good possibility it's because your car uses the r135 or r134 coolant and not the r12 coolant, they are trying to keep the r12 off the shelves for non industrial use....hope this helps you....shia
appears we have an Air lock scenario and you will need to perform a
the vehicle on level ground, when cold remove coolant filler cap,
start engine and leave to idle, turn heater on full and blower to
max. When engine reaches operating temperature watch and listen near
coolant filler, keep clear as gurgling and hopefully a boil over
should occur. Top up with very warm coolant and wait as it may do it
for heat inside vehicle if warm replace coolant cap but keep an eye
on temperature gauge as the ~Air lock may have moved on from heater
matrix/core so proceedure needs to be carried out again from COLD.
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