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My car radiator fan is two speed one for cooling the motor and one for the air condition.the fan does not turn on to cool the motor.

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Hi, the problem you are having is going to be with the fan switch that turns the fan on now if you are sure the fan is not working and the problem is not thermostat or water pump related then all you need to do is follow the wire from the fan and where this wire goes to is the temerature controlled switch for the fan.
the best thing for you to do would be to get the part first so you know exactly what part your going to be changing, its not a difficult job to do but remember your going to loose some coolant so this will need topping up and any air in the system will need bleeding out.

Now other causes of over heating could be thermostat if this was at fault then the bottom half of the rad would be hot and the top half will be cold so if it over heats and the rad is like that than that points towards thermostat failure, you can also tell by putting the heater on in the car and if it blows out only cool air then this means the coolant isnt circulating properly and this would be due to thermostat.

so if you have heat and the temp gauge goes up to the hot and the rad is hot all over then this points towards the rad fan switch not working.

check your car to make sure then go and buy the part then you will see exactly what your changing.

let me know how you get on or if you need further assistance ok

Posted on Jul 16, 2010

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Heat temp gauge on motor if faulty can it effect the cooling temp of the air conditioning on a saab 93 convertible 2002 model


No. The engine temp sensor affects engine idle speed, and timing. There is an in car temp sensor that controls the position of the blend door and the fan speed if the system has automatic temperature control.It also cycles the AC compressor clutch and the radiator cooling fans.

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What could cause my 93 Chevy Cavalier to overheat? I just put in a new water pump and a new thermostat but it still tends to overheat and now has a leak from the thermostat intake hose.


We need rule out a few basic things to properly diagnose the overheating problems.
Step 1:Do you think?there is enough antifreeze in the radiator? Don t just look inside the plastic overflow bottle only, you should remove the radiator cap and then look inside the radiator.We should see the fluid level whether it is at its proper level or not. Most cars and trucks will hold a mixture of coolant and water .You should have the cooling system pressure tested for a leak if you have to add more than a pint of fluid .If we see any obvious fluid loss in the engine compartment or on the ground , we should also have the system tested.
Step 2:If you don not see any coolant leak or low fluid level , then you should determine when the overheating problems occurred.If the engine overheats only at a stop or idle ,Most front wheel drive cars will use an electric cooling fan motor located in front or behind the radiator. The existence of function of the cooling fan is to improve airflow across the radiator at stops and low speeds.The fan is controlled by sensors,it regulates the engine temperature and additional load that might be placed on the engine.The cooling fan is required by the air conditioning compressor to operate at idle when the compressor is on.It is a quick way to check the cooling fan operation to turn on the air conditioner.
Also the cooling fan should come on with the air conditioner compressor. Some automobiles will have two electric fans, one is the air conditioner condenser fan and the other is for the radiator .It will have a belt driven fan blade and fan clutch if your vehicle does not have an electric cooling fan on the radiator . This fan should be pulling a large amount of warm and hot air across the radiator onto the engine to keep it cool.The radiator fan is usually closer to the middle of the radiator. The radiator fan is responsible for cooling of the engine, while the condenser fan is responsible for increasing air conditioning efficiency at idle and low speed.If there is ample airflow across the radiator at idle. The radiator is responsible for the primary heat exchange for the engine, and airflow is crucial at this time.
Step 3:Again, we have ample airflow across the radiator, so we must inspect the proper antifreeze circulation.If there is a restriction in the system , it will produce the same affect.Water calcification can accumulate in the radiator and then drastically reduce the flow of coolant at a very high speed. Removing the radiator from the vehicle are the only two real cures for a clogged radiator.It be a waste of time and money trying to correct a restricted radiator when you use a can of radiator flush additive. Of course there are more technical issues that could produce an overheating problems, but the check list described above will identify the most common.Anything you can do to help the mechanic to deal with the problem will probably result in less diagnostic charges, and it might help insure a proper diagnosis of the problem at once of your 1993 Chevrolet Cavalier.
Step 4:You must inspect an electric motor cooling fan ,it will start with ignition key switch off, it has failed and needs to be replaced if the 1993 Chevrolet Cavalier fan motor does not spin freely . The electrical system operates the fan needs to be tested,If the fan motor "freewheels" that . Start the engine and then turn the air conditioner to the coolest setting, if your automobile does not have an air conditioner skip this step.The car air conditioner will operate the 1993 Chevrolet Cavalier cooling fan should activate within five minutes , the fan motor fuse must be checked first and the fuse condition is good the remainder of the electrical system must be checked.
Step 5:A wiring schematic is needed to further troubleshoot this problem ,which is located in a repair service manual. You may use the wiring schematic to trace the circuit through the fuse and relay components, if everything of 1993 Chevrolet Cavalier tests fine, the fan motor has failed and needs to be replaced. The most common repair is the cooling fan motor failure.
This isn't only theory. You can take these steps into practice.You can deal with the 1993 Chevrolet Cavalier overheating problems yourself.

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1 Answer

2002 jeep sport. Overheating while at idle. Changed radiator, thermostat, water pump. Only runs cool when ac is on. What next?


relay that controls the speed of the radiator cooling fans must be checked
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Sep 15, 2013 | Cars & Trucks

1 Answer

Fan will not turn off


which fan? Interior fan, or radiator cooling fan? Is it the radiator cooling fan, or the fan controlled by the air-conditioning?

Run the vehicle, turn on and off the air-conditioning to identify which of the fans in the engine bay is the one triggered by the air-con and which is the primary cooling fan.
If the primary cooling fan is permanently engaged, then first try replacing it's relay as it may have fused closed.

Oct 29, 2012 | 2005 Cadillac Escalade

1 Answer

Radiator installation on 2003 Kia Sorento


That is a VERY easy radiator.
Loosen radiator drain plug and drain coolant from radiator.
Disconnect cooling fan connectorsRemove upper and lower radiator hoses after marking them to ease installation.
For vehicles equipped with automatic transaxles, disconnect transmission cooler lines at transaxle.
Remove air conditioner condenser fixing bolts and radiator bracket fixing nuts.
Remove the radiator, radiator cooling fan, air conditioning cooling fan and transmission cooler lines from the vehicle as an assembly.
Transfer all necessary parts (fan assemblies, cooler lines, clips, speed nuts, fittings, etc.) to the new radiator.

Reverse procedure to install.

Fill and bleed cooling system.

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1 Answer

Cooling fan burned up


Get a new fan motor and blade from GM or from an aftermarket supplier.

GM parts are usually better than the aftermarket ones, though for fit and functioin.

May also look into checking the relays and harness. If the terminals of the fan show they are getting current, then the motor will have to be replaced if not turning or obviously burnt.

Good luck on this repair.
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Inspect/Replace

CAUTION
The fan that draws cool air across the radiator can be driven by either a belt or electricity. Rotating fans can be dangerous. Some are controlled by an automatic switch and can start unexpectedly. When working on electric fans, keep in mind that electric cooling fans should be disconnected when working around them.
When replacing a radiator fan motor, always refer to the vehicle's service manual. The following is a general guide for cooling fan replacement.

  • Disconnect the negative battery terminal at the battery. This is necessary on vehicles using electric fans, but some vehicles may require the relocation of the charging system components.
  • Drain the cooling system.
  • Loosen or remove the hose clamps, then remove the upper and lower hoses from the radiator.
  • Disconnect the transmission cooling lines and plug them off, if equipped.
  • Disconnect the electric fan motor connector, if equipped.
  • Remove the fasteners attaching the fan module to the radiator.
  • On some vehicles equipped with air conditioning systems, it may be necessary to discharge the system. This is the case if the radiator and condenser can not be separated in the vehicle.
  • Remove the upper radiator cross member or mounts.
  • Disconnect and plug the air conditioning lines at the condenser, if needed.
  • Remove the radiator and fan module as one unit if possible.
  • Separate the fan module from the radiator.
  • If required, separate the radiator from the condenser.
  • Remove the old fan module.
  • Install the new fan module onto the radiator.
  • Reattach the fasteners attaching the fan module to the radiator.
  • If equipped, connect the electric fan motor connector.
  • Reinstall the radiator.
  • Refill the cooling system.

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1 Answer

Air conditioner fan is making a loud noise


1. Could be a caught foreign object between A/C (air conditioning) fan and cooling radiator, producing this loud noise.
2. Could be a damaged fan blade, mowing the cooling radiator.
3. Could be a loud noise comming from the fan's electrical motor.
4. Could be a broken off fin (small wing) of the cooling radiator, striking the A/C fan, producing this loud noise.

Jun 14, 2010 | Dodge Grand Caravan Cars & Trucks

1 Answer

The one fan willl not come on but both will when motor is hot


I'm not familiar with your particular car, but this info may be of some help to you...

Dual fan cars work in a few ways:
1) Some only use one fan during normal cooling, and turn on the second either when the temperature reaches a certain level, and/or when the air conditioning is running.
2) Some use both fans for normal cooling, but at least one of the fans have a dual-speed motor. Generally only one has dual-speed motor, which operates at low speed during normal cooling cycles, and operates at high speed at a predetermined temperature, and/or when the air conditioning is running.

Based on this, it's possible that your system is working correctly, or you have the chance that your low speed portion of the cooling system is not functioning. Check the wires going to the fans. If there are only two wires, then it's a single speed fan. If there are three wires, it's a dual speed fan.

Based on that information, you should be able to determine if your system is working correctly or not.

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1 Answer

Heater dump valve, causing car to over-heat when heat is on


To properly diagnose your overheating problem we need to rule out some things.
First: Is there enough coolant/antifreeze in the radiator? Don't just look inside the plastic overflow bottle, but remove the radiator cap (when the engine is cold) and look inside the radiator. You should be able to physically see the fluid level if it is at its proper level. Most cars and trucks will hold 1 1/2-2 gallons of coolant and water mixture. If you have to add more than a pint of fluid you should have the cooling system pressure tested for a leak. If you see any obvious fluid loss on the ground or in the engine compartment, you should also have the system tested for leaks.
Second: If no coolant leak or low fluid level is present, then determine when the overheating complaint occurs.
If the engine overheats while at a stop or idle only:
Most front wheel drive cars use an electric cooling fan motor located in front or behind the radiator. The function of the cooling fan is to improve airflow across the radiator at stops and low speeds. The fan is controlled by sensors that regulate the engine temperature and additional load that might be placed on the engine.
The air conditioning compressor will require the cooling fan to operate at idle as long as the compressor is on. A quick way to check the cooling fan operation is to turn on the air conditioner. The cooling fan should come on with the air conditioner compressor. Some cars will have two electric fans, one is for the radiator and the other is the air conditioner condenser fan. Usually the radiator fan is closer to the middle of the radiator. The radiator fan is responsible for engine cooling, and the condenser fan is responsible for increasing air conditioning efficiency at idle and low speed.
If your vehicle does not have an electric cooling fan on the radiator it will have a belt driven fan blade and fan clutch. This fan should be pulling a large amount of warm to hot air across the radiator onto the engine. What you want to determine with either fan situation is that there is ample airflow across the radiator at idle. The radiator is the primary heat exchange for the engine, and airflow is crucial.
What if the engine overheats while at high speeds on the freeway?
Again, airflow and coolant circulation are crucial. At 55 MPH we can assume you have ample airflow across the radiator, so proper antifreeze circulation is the thing to inspect. I compare overheating at 55MPH to jogging with a sock in your mouth. The faster and longer you jog, the more air you are going to require, and with a sock in your mouth you are going to have to breath extra hard to maintain the proper amount of air to keep you going. At 55MPH the water pump is pumping a large amount of hot antifreeze throughout the cooling system.
If there is a restriction in the system like a kinked radiator hose, a restricted radiator, or a stuck thermostat, it will produce the same affect as the sock in the mouth scenario. Rust and water calcification can accumulate in the radiator and drastically reduce the flow of coolant at high speeds. Removing the radiator from the vehicle for disassembly and cleaning or radiator replacement are the only two real cures for a clogged radiator.
Using a can of "radiator flush" additive might help as preventive maintenance, but will probably just be a waste of time and money trying to correct a restricted radiator.

Hope this helps, best regards.

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2 Answers

Air cool when driving, when idling gets warm and car overheats


Take a look through your front grill and see if there is alot of bugs,dirt,etc. blocking the cooling fins of the condensor and radiator. If so try rinsing them with a water hose, or air pressure. Some cleaners work well also,like " Simple Green " or gunk degreaser. Catch the fluid in a container and dispose of properly.

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