Question about 1998 Audi A4

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After the motor runs for a while it get warn but if fan stays on air gets cold????

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Heator core may be cloged or possible for air in the collent lines

Posted on Nov 06, 2010

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Dash light on looks like low fuel warning light but has dots under it


its wintertime here we are in need of the heating system to work. it started with blowing warmair on dr's side,and cold on the pess side, we flushed the system, changed thermostat,that didn't help. so we changed water-pump, that didn't help. so we changed heater core, that didn't do it either, so we changed radiator, and heater switch to the gages then we cleaned the plugs out to get better continuity. that didn't help, either. the fans run constantly without the engine on as well. it now is back to blowing cold air on both sides. totally baffled by this car.

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Not sure I follow your question. If the blower motor runs at high speed on all fan settings, there could be a short in the controller. The fan control and ac-heat control are separate circuits in the controller.

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Why does engine fan stay on when engine's cold? 95 jimmy


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2002 Suburban_ Engine off but air stays on. When engine is on a/c light stays on & ait stays on even if the fan is turned off


Fan will run for a certain period of time after shutting down motor of vehicle. This is normal. Your engine is still hot when you turn the key off. There are sensors that tell the computer when the engine is cool enough for the fans to shut off.

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I HAVE 2008 FORD FUSION V6 SEL, THE HEAT SYSTEM IS TO SLOW IT TAKES 20MIN TO 25 MIN TO WORK.THANK YOU


This sounds like a bad water thermostat or a cooling fan relay stuck on Run. The thermostat should be under the top housing of the motor where the big radiator hose meets the engine.

The other method of cooling a hot motor is the electric fan attached to one side of the Radiator. This fan may run more when the A/C is on, but when you are using the heat it should not run constantly. This fan should be off when the motor is cold.

In some cases the sensor for the fan will make a trouble Code and light the "check engine" light on the dash. You can get a free scan from Autozone or Oreillys.

Once you get heat in the motor your heater should work quicker. If the motor is hot and the heater is not, feel the smaller hoses running from the motor to the Firewall. They are about 5/8 to 3/4 inch diameter hoses. They should be hot with the heater on. If they are hot, and the heater in the car is only warm or cold, you have a ductwork problem under the dash. If the hoses are not hot, you have a flow problem. With the flow problem, either the heater core is plugged or a water valve is not turning on.

I hope my solution has identified the problem and given you a way to trace it. Start with the thermostat, new gasket, and some antifreeze to replace spillage. If you did have a warning light, either disconnect the NEG battery cable for 10 minutes or ask Autozone or Oreillys to clear your car with their scanner. Old error codes will stay in memory for 25-35 Startups if you don't clear them.

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Fan motor does not blow hot or cold air when turned on


your fan motor is located on firewall behind engine towards middle of car under a cover gain acess turn fan on inside car lightly tap back of motor if fan starts running you have a bad fan motor i assume you have already checked your fuses

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No heat/defrost 01 corolla


Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.

Jan 17, 2010 | 2001 Toyota Corolla

1 Answer

Heater won,t blow warm . core ok. fan runs .will only blow cold


EITHER VALVE STUCK TO ALLOW WATER IN MATRIX OR YOU HAVE AIR BLOCK IN IT. TAKE OFF TOP HOSE AND RUN MOTOR, TOP UP RAD AT SAME TIME, USED A DESCALANT IF WATER MUDDY /RUSTY LOOKING

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