Question about 2002 Ford Mustang

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Engine heats when stopped and idling , cools off when car is moving . Electric fan is blowing properly I think.

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The problem sounds like it could be the fan isn't working you need to check, let the engine idle until it starts to overheat & check if the fan is working......hope this helps......cheers

Posted on Aug 09, 2010

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1 Answer

Engineover heating at complete stops


First thing I'd check is if the radiator cooling fan(s) are operating.

The only times the fan is needed is when the engine is at an idle.
When the car is moving, the air stream forces air through the radiator without the fan.

A lot of fans on newer cars are electric, and controlled by a thermostat, which turns on the fan(s) when the engine gets to a certain temperature.

If this is the setup you have, you'll need to warm up the car to operating temperature, then at idle, check under the hood and see/hear if the fan(s) are running.

Apr 03, 2014 | Suzuki Forenza Cars & Trucks

1 Answer

Suburban overheating and air conditioner blowing hot


If you have a viscous fan hub have it replaced as it is not working. The problem you have is that the engine is not driving the fan to draw air through the radiator when idling so the engine overheats . When moving the air flow from driving cools the radiator and so the temp goes back down. If you have electric fans have the codes read to find the fault or check why the electric fans are not working.

Jun 17, 2013 | Chevrolet Cars & Trucks

1 Answer

Car blows warm air when idling


It sounds like your AC unit could be overheating or even damaged.

AC units have a sensor that will turn them off automatically to prevent damage from overheating. If there is an insufficient amount of air flow, the unit will heat up, and then eventually turn off.

When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.

However, the AC unit could be completely blown. The cold air while moving could be just a case of air being forced into the car. Think of a house fan, the fast the wind blows on you, the cooler it gets.... Thus, it could be an illusion that the AC is working when car is in motion, when it really isn't.

Hope this helps.

Jun 09, 2012 | 2004 Lincoln LS

1 Answer

A/c blows hot air when the car is not moving but it will blow cold air when the car is moving.


Check to see if your electric cooling fan is working when the vehicle is in park with the engine and a/c running. If the fan isn't running then the a/c won't be able to blow cool air as it can't get rid of the heat through the condensor which is located ahead of the radiator. When you are driving over about 35 mph there is enough air being forced through the condensor and radiator to get rid of the heat and the a/c will start cooling properly again. If the fan isn't running and you sit with the car idling long enough [such as in heavy traffic] then the engine may overheat as it also has no way of cooling if the fan isn't working. Usually this fan is powerd by a 30 amp Maxi fuse but each model is a bit different. Your owners manual should have an illistration of the fuses and what they power. Good luck, hope this helps a bit!

Aug 11, 2010 | 2008 Chrysler Pt Cruiser

7 Answers

My AC blows hot air at stop lights. It works great when the car is running on the free way, but does not work when the car slows down. Any idea what the problem is????


Have you radiator clutch fan check out, sounds like its bad, air blows through radiator and a/c condenser while driving and no air blows through at stops, will cause a/c pressure to go up and not cool.

Jul 14, 2010 | 2005 Chevrolet Equinox

1 Answer

My 2002 Pontiac Montana engine temp quickly increases at idle and while stopped at lights. The engine temp is OK while moving. Please advise of possible causes as I am concerned about engine damage from...


Check your cooling fan motor at radiator, should come on at about 220 -225 deg, while moving you have air blowing through radiator and will keep engine cool, at stops no air going through radiator and will cause over heating. Have fan check out

Jan 04, 2010 | 2002 Pontiac Montana

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.

Nov 21, 2009 | 2001 Lincoln LS

1 Answer

This car runs hot when idleing but is fine at highway speeds. I just replaced the water pump and had the radiator rodded out. the electric fan is running fine and moving air well.


The thermostat might be stuck open. If it is then water running into the radiator is not spending enough time there to cool off before flowing back to the engine block. At speed the increased airflow is having a greater cooling effect while blowing through the radiator fins. With the car totally cool, open the radiator cap and then start the car. Watch the water flow in the radiator. If it is flowing straight through right from the start, you'll know it is the thermostat. It should sit in the radiator until the engine reaches opening temperature and then the flow begins. As soon as the cool water from the radiator reaches the thermostat, it closes and the flow stops. So constant flow equals bad thermostat, flow then stop then flow equals working properly.

Aug 03, 2009 | 2002 Ford Mustang

2 Answers

Fan works but no hot air


have you checked the coolant level on the rediator?if its low you wont get alot of heat

Jan 08, 2009 | 1998 Ford Taurus

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