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Re: cooling fans dont turn on
It doesnt stay on all the time it only comes on to cool down ,, it may be working ,,, drive it for about 10 or 15 mins , then stop leave the car running and watch the fan for a few mins it should come on if not then the fan motor has went bad or u may have a bad fuse .
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Re: cooling fans dont turn on
Thats your main radiator fan, meaning if it don't come on then vehicle will get hot. check the fan for operation by letting the vehicle idle for a while, keep check the temp gauge and what for the fan to come on at the half way point.
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no car make or model mentioned so getting an answer is hit and miss
however what you describe indicates a fan drive problem so if it is electric fan cooled-- check the fans for full blade speed ( weak motor operation) or if viscous fan hub ( fan clutch) replace the viscous hub
it is all about moving air through the radiator when the vehicle speed is slow and the engine rpms are high
if the fan is not doing the job of pulling air through the radiator , the car will overheat
at highway speeds the ram action of the air flow virtually makes a fan useless as there is more than enough air passing through the radiator to cool the water
Im guessing here but I suspect that you have a viscous fan hub
There are items you need to check.
1. Is the cooling system losing coolant. If so the engine will overheat and you need to find the location of the leak. It may be internal to the engine or an external leak from a hose, a water pump seal or a crack in the radiator or a failing radiator cap.
2. Is the electric radiator fan coming on when the engine coolant temperature increases? If the coolant is getting hot the fan or fans should be running. If not your need to detect the cause of the fan not starting .
3. You may have a partial blockage in the radiator with a build up of debris which is slowing coolant flow through the radiator or a partial blockage in the cooling jackets in the engine. Coolant needs to be removed from the engine every few years, the radiator flushed out and then new coolant is added to the system.
an engine will overheat if the rad cooling fan is not working, this will have to be check to see if its the fan motor, the fan relay. low coolant level, top up coolant check for leaks. could be head gasket problem, bad water pump(impeller worn).
Check for blown head gaskets. GM aluminum-head engines are VERY UNFORGIVING when it comes to being overheated. The heads usually warp, resulting in blown head gaskets and repeated overheating like you are describing. One of the main symptoms will be that you fill the cooling system and open the bleader screws to get the air out of the system. Then you start the engine and run it until the cooling fan comes on. When the fan comes on, place your hand behind the cooling fan and see if the air coming through the radiator is HOT. If it is blowing cool air, the coolant is not flowing through the radiator like it should. This is usually caused by high pressure in the cooling system due to combustion gasses getting in.
this could be a electric cooling fan located in front or behind the radiator,if your in traffic and the fan doesnt kick in your car wil overheat but when your just driving it probably will not.A simple test is to open the hood run the c ar and turn on the air conditioning,the fan should come on shortly if it doesnt this is a problem and should be lloked into,also make sure coolant is topped up and there are no leaks as air pockets would also cause overheating issues
If your thermostat is stuck in the closed position , it will not let coolant circulate to the radiator and the engine will overheat quickly. Fans won't come on because the temp sensor for the fans is usualy in the radiator. If the thermostat dosn't send hot coolant to the radiator , the fans don't know they should be on.
Only solution is to replace the faulty thermostat. I recomend that you dont drive the car at all with the bad thermostat. major overheat could severly damage Heads , head gasket , engine.
THIS SOUNDS CRAZY BUT, ON SOME OF THE OLD SCHOOL CARS, THEY HAVE A CLUCH FAN.. AND IF ITS BAD, THE CAR WILL OVERHEAT WHEN DRIVING AND COOL DOWN AT IDLE.. I DONT THINK THE CADY HAS A CLUTCH FAN, BUT I BET ITS IN THE FAN.. GOOD LUCK KEITH..
The radiator cooling fan relay has most likely failed. It is underneath the air cleaner on the frame rail just behind the radiator. NO cooling fan = overheating. This is the first thing i would look at. Best way to tell is when the van gets hot see if the cooling fan is on. You will hear it running if it is coming on. It will set a code for the cooling fan relay also.