Cooling fans only work when a/c is on and turn slower than normal.have already changed cooling sensor; checked fuses and relays. cooling sensor has 2 wire's, a red w/ blk stripe and a solid yellow. could only get 4.91 volts out of red wire and 1.78 out of yellow wire. have also bled coolant system.
Replace thermostat . before putting in a new one.remove both hoses on radiator .flush out radiator then your block where thermostat go .remove the hose to water pump. use garden hose .dont turn it on too high. just enough to get the rust and gunk out of block.flush at the top where thermostat go.watch the water . from your water pump. it look dirty .keep flushing until you see clear water and a good flow not a tiny flow .make sure your water is too high. also change coolant sensor. this should help i had the same problem.
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When you changed these components and refilled the cooling system, did you purge the air out of the top of the system by opening the bleeder valve. These engines have coolant in areas higher up in the engine where air can be trapped during refill. Air trapped in the system will cause overheating issues. Otherwise, the only thing you haven't mentioned in the system is the radiator and fan assemblies. They could be suspect, as could a possible blown head gasket.
When the temp sensor fails, the computer will turn on the fan relay as a precaution to overheating. Once you find the problem with the sensor you may also fix the fan problem. If the check engine light is on you should also check the computer for trouble codes.
You need to stop using it immediately before you cause some damage or more than you may already have That is just common sense. It should not overheat or be any different than it was in the past without problem
The car has to be checked over/diagnosed,tested,etc for various issues to resolve
Borrow or Rent a car until resolved
No way to guess at the problem
You should have some type of codes avail even if the check light isn't on,you need professional help to get a start on resolving
The timing belt maybe worn & jumped or the head gasket bad.
Over heating isn't usually a cheap repair unless the thermostat sticks partially closed
The RPM moves around the car is 11 years old,so it may just need a though going over
Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs and such
If you depend on a repair shop to do things & don't have the knowledge to request work done throughout the year,then you run into a lack of proactive preventative maintenance situation. Most things are simple looking back, once resolved
FIRST OF ALL I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP THEN CHECK SEE IF COOLING FAN RUNNING.WHILE CAR OVERHEATING. IF NOT CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.HOT WIRE SEE COOLANT FAN WORKS IF NOT, COOLING FAN MOTOR BAD NEED REPLACING.IF COOLING FAN MOTOR WORKING PROBLEM COULD BE IN FAN MOTOR WIRING OR PCM FAILED.
Is the radiator fan working when its hot? if yes than let the car cool down,than open the radiator cap and start the engine, if its blowing the water out it might be that you would have to remove the cylinder head due to a blown gasket.good luck
LOOK UNDER THE HOOD IN THE ENGINE COMPARTMENT. ON DRIVER SIDE FOR FUSE BOX.LOOK ON FUSE BOX COVER IT HAS LOCATION FOR FUSES AND RELAYS.MOST TIME PROBLEM WITH COOLING FAN CIRCUIT WILL CAUSE CHECK ENGINE LIGHT.BAD ENGINE COOLANT TEMPERATURE SENSOR WILL CAUSE COOLANT FANS NOT TO TURN CAUSE OVERHEATING. ON.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP SEE IF STOP OVER HEATING. IF ALL LOOKS GOOD HOTWIRE COOLANT FANS MAKE SURE FAN MOTORS ARE GOOD AND NO SHORTS AT FAN CONNECTOR WIRES.
Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE
Yes if it hydraulically operated it could be because the pump for the fan is bad. If I am not mistaken the fan is run off of the power steering pump correct. check and make sure the pump is working correctly. I have not seen a hydraulic motor on a car I know they put them on a lot of diesel trucks like humvees and some Chevy diesels but not on a car. Most are usually electrical. I know on humvees with a hydraulic fan they have a fan controller check this and make sure it is working right you can unplug the controller and the fan should stay ingaged and turn faster.
It sounds like your cooling fans are not comming on by themselves, but when you turn on the ac it forces them to turn on. Make sure relay is good, then replace coolant temp sensor, this may have failed no telling pcm to turn on cooling fans. Thanks