2007-07-14 20:26:01 · 11 answers · asked by Jack K 1 in Cars & Transportation ➔ Car Makes ➔ GMC
I own a shop, and think this; When the engine gets hot, it has a temperature sensor that turns the fan on, it's probably bad. It should be located either in the thermostat housing, or screws into the head on the drivers side at about spark plug level towards the front of the engine. The reason the fan comes on when you turn on the AC is; It is set up to come on manually when the controls is moved to AC. With the AC on, it needs the fan all the time, and when it's off, it needs the fan only when the engine temperature reaches about 208-210 degrees. 99% of the time the problem is the temprature sensor, so if the fan works when the AC is on, this tells you the fan & relay are working, so replace the sensor, and you should be good to go.
Glad to help out, Good Luck!!!
2007-07-14 23:27:28 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Your vehicle has an electric radiator fan. When the air conditioner is turned on it automatically turns on the fan. Which explains why the temp goes back down. You either have a bad fan relay, or a temperature sensor is bad.
2007-07-15 14:42:56 · answer #2 · answered by Bill S 6 · 0⤊ 1⤋
Jack there is a fair chance that a temperature sensor is not turning on the electric fan or speeding it up. However these fans also have a pressure sensor in the a/c system which turns the fan on or high when the a/c is on. So that is probably working. So turn the a/c on, the fan speeds up or turns on, engine cools down. A car electrician can find the dud one and replace it in a few minutes - cheap.
2007-07-14 20:36:09 · answer #3 · answered by Anonymous · 1⤊ 1⤋
You probably have a two fan radiator cooling system.
The first one comes on when the engine is warmed up
The seconds one comes on when the air conditioner is on (this is why it cools down with the A/C) or when the engine temperature gets too high
Either the too high temperature sensor is bad or the computer is bad.
2007-07-14 20:37:55 · answer #4 · answered by startrektosnewenterpriselovethem 6 · 1⤊ 1⤋
super cooling porblems! I advise you flush and fill the radiator when you regulate the thermostat, examine your oil, if evidently like choclate milk, and not oil, then there's a head problem to boot, as some distance by fact the ac getting warmer while the motor does, that's by motor lag, while the motor's warm it lags. one extra element, have your water pump checked, or look into the radiator (no longer whilst IT"S warm), at established working temperature, and you may desire to work out a circulate from left to suited interior the hollow. or basically take it to Ford, it is the least complicated,and the suitable element to do, they built it enable them to restoration it.
2016-11-09 09:03:14 · answer #5 · answered by ? 4 · 0⤊ 0⤋
What kind of car or truck are you talking about?
It sounds like your A/C operation is doing double duty: Condenser fan cooling the condenser and the radiator when the A/C is in operation. Check to see if your fan tied to the water pump is turning or if maybe the fan belt is broken; allowing the H20 pump and radiator fan to be non-functional. Check also to see if the alternator is running with its own fan belt.
2007-07-14 20:51:35 · answer #6 · answered by Phillip S 6 · 0⤊ 1⤋
Thermostat is getting stuck open. Or is going bad and needs to be changed.
2007-07-18 14:18:31 · answer #7 · answered by Aisha L 1 · 0⤊ 0⤋
sounds like to me you have a coolant fan not working , or a bad coolant temp sensor
2007-07-15 08:00:27 · answer #8 · answered by Mike H 3 · 0⤊ 1⤋
crazy. i always heard open your windows and turn the heat on high to help with overheating.
2007-07-14 20:29:51 · answer #9 · answered by Good Ol' Gary Shanty 4 · 0⤊ 2⤋
when you turn the ac on, the computer turns up the ilde on the car which probably circulates your coolant faster. i would change out my thermostat first.
2007-07-14 20:29:51 · answer #10 · answered by steven g 2 · 0⤊ 2⤋