Question about Subaru Legacy

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Cooling fans run when car is cold and hard to start, engine runs ok when warm. I have disconnected the two sensors,(thermostat housing and under the inlet manifold) and the fans still run. Any help appreciated !

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  • Bill Warriner Aug 12, 2008

    The car is a 1994 2.2ltr Subaru Legacy Brighton

  • Bill Warriner Aug 12, 2008

    There is no solution attached to this email, please try again.



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Thermostat has got worned out which makes the fan to work even during the cold state so change the thermostat which ll rectify your problem

Posted on Aug 12, 2008

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Replace the sensor (thermostat) do not unplug this coz this would trigger a short circuit causing the fan to work unnecessarily (cold state)

Posted on Aug 12, 2008

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Check out this site

Posted on Aug 12, 2008

  • tech expert12 Aug 13, 2008

    Did the solutions from all of us experts solved your problem if not then let us know the current updates so all the fixya experts can assist you further.


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Get the the thermostat checked.

Posted on Aug 12, 2008

  • Legin Varghese
    Legin Varghese Aug 12, 2008

    The thermostat controls the radiator fan. Hope you have not made any changes in fuse lately.


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1 Answer

Hard to start cold - then runs rough til warm,then ok.

It could be that you have a bad ETC sensor, but these cars can and do have problems getting air out of them, keep burping the system, if there's a lot of air in it, you'll see bubbles coming up as the car is running. and yes, you could very well have a leak and not be able to see it and it won't leak on the ground just when your driving and the engine is hot....I just went through this same thing with my sons 1989 Supra.

Aug 10, 2015 | 1998 Toyota Corolla

1 Answer

Air conditioner goes from cold to hot when car is parked and running. When the car is going the a/c is nice and cold. 2003 mazda mpv lx

It is normal for the A/C air to warm up a little when stopped. Less airflow thru the condensor. It is normal for the engine temperature gage to rise up to about the 80% mark on its scale before the cooling fan kicks on. The gage will also show about the same reading on the first start of the day, until the thermostat opens.

If the fan(s) are not working properly the A/C air and engine temperature will rise. If you have a belt driven clutch fan, the clutch may be worn out. All cooling fans kinda sound like miniture jet engines when its hot out, more so when the A/C is on. Replacing the clutch is all you can do for a belt driven fan. Electric fans are more complicated....
Check all main power electrical connections first.... Electric Fan(s) not working, Checking the fan(s), relay, fuse and engine temperature sensor's.
Verify that the fans work by unplugging them and run jumper wires to the fan(s) from the battery. If they run, your problem lies elsewhere. If either does not run, it's the motor.
Next thing to check is for power at the fan connectors. You have to be cautious doing this because the engine needs to be running and warm if not almost hot, and the A/C also needs to be on. (Both must be on and running for the duration of this checklist.) The A/C fan is on the passenger side and should come on almost the instant the A/C is turned on. It is also the secondary engine cooling fan and should cycle on and off in relation to engine temperature. Use a test light to probe the two wires on each fan. If you find power the fan motor(s) is/are probably bad. If there is no power to fans, roll up your sleeves!

The temperature switch is usually located above the oil filter. If the dash gage is working, its probably OK. Next is the Fan Control Temperature Sensor, located IN or CLOSE to the thermostat housing. You will find out if it is working later is this checklist. I just wanted you to know where it is. Next is the relays and fuse's. Usually located in the engine compartment on the passenger side power distribution box. You will need to remove anything over the cover to open it. If the fuses are OK, tap on the relays or pull them out and push back in. If the fans are still not running, pull a relay and probe the socket terminals for power. Two or three of the terminals should have power, usually criss-cross from each other. Two are hot battery power, and the third is the "signal" voltage which triggers the relay to send 12V battery power to the fan. This signal voltage comes from the sensor at the thermostat. If only two terminal's have power, then I would replace the thermostat sensor if not both sensors.

Hope this is clear as mud! and helps! Please let me know what you find.

Aug 27, 2011 | 2003 Mazda MPV

2 Answers

While in idle in a hot sunny day my car over heats. im getting 13 highway miles per gal. i think the oxygen sensor may be out? my AC doesnt work unless it is cold outside. and i had just replaced the...

the overheating could be a number of things from a thermostat, cooling fan not turning on(bad fuse), bad water pump or a circulation/radiator issue. Let the car run, have someone watch the temp in the car. As it starts to climb see if the cooling fan turns on. If not this is ur prob. If not replace the thermostat, usually less than $5. Ur check engine light should be on if the o2 sensor is bad assuming the previous owners didnt disconnect it. As far as the trans goes, run the car shift thru all the gears or go for a short ride and check the fluid while its running. If the fluid is ok, bring it back to whoever put it in. There should be some type of warranty. Good luck, hope i was some help

May 12, 2011 | 1996 Ford Taurus

1 Answer

Want to know whats these codes mean [Engine rpn 704 rpm],[Map sensor 45 kpr], [cool ant temp 141f], [Dtc t caused rreezerrame p1281]. for a 2000 grand cherokee

Hi, the first part is data taken along with the code. The code P1281 indicates the engine is running cold (141 degrees--should be at least 190). Is your temp gage running lower than you are used to? If yes, it may be your thermostat has failed open. I have pasted below instructions for replacing the thermostat. Please let me know if you have any questions, and thanks for using FixYa.

3.7L & 4.7L Engines WARNING Do not loosen radiator drain **** with system hot and pressurized. Serious burns from coolant can occur.

NOTE Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

  1. Disconnect negative battery cable at battery.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Remove splash shield.
  5. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
  6. Remove thermostat housing mounting bolts, thermostat housing and thermostat.

To install:
  1. Clean mating areas of timing chain cover and thermostat housing.
  2. Install thermostat (spring side down) into recessed machined groove on timing chain cover.
  3. Position thermostat housing on timing chain cover.
  4. Install two housing-to-timing chain cover bolts. Tighten bolts to 115 inch lbs. (13 Nm).
    CAUTION Housing must be tightened evenly and thermostat must be centered into recessed groove in timing chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.
  5. Install lower radiator hose on thermostat housing.
  6. Install splash shield.
  7. Lower vehicle.
  8. Fill cooling system.
  9. Connect negative battery cable to battery.
  10. Start and warm the engine. Check for leaks.

Removal & Installation, 4.0 liter engine

  1. Disconnect the negative battery cable.
  2. If necessary, disconnect the coolant temperature sensor electrical connector.
  3. Disconnect the upper radiator hose from the thermostat housing.
  4. Remove the attaching bolts and lift the housing from the engine.
Remove the thermostat and gasket.
To install:
  1. Clean all gasket surfaces thoroughly.
  2. Place the thermostat in the housing with the spring inside the engine.
  3. Install a new gasket with a small amount of sealing compound applied to both sides.
  4. Install the water outlet and tighten the mounting bolts to 200 inch lbs. (23 Nm) on V-8 engines and 15 ft. lbs. (20 Nm) on non-8 cylinder engines.
  5. Install the upper radiator hose to the housing and tighten the hose clamp.
  6. Connect the coolant temperature sensor connector to the housing.
  7. Refill the cooling system.

Apr 13, 2011 | 2000 Jeep Grand Cherokee

1 Answer


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.

Dec 26, 2010 | 2006 Ford Fusion

1 Answer

Over heating

Thermostats in cars are often neglected, if not totally forgotten, units. Yet they play an important role in the general performance of cars by restricting water flow until the engine has warmed-up. Thermostats are heat sensitive valves that open and close. On cars they prevent circulation of coolant to the radiator until the engine is warm enough. When the thermostat is closed water only flows through the water pump and water jacket to let the engine warm quickly. When the thermostat opens, water can then pass through the radiator for general cooling.
google_protectAndRun("ads_core.google_render_ad", google_handleError, google_render_ad); Having a car that warms quickly is particularly useful in cold weather when you want to use your car heater as soon as possible. The thermostat is in a small housing positioned where the top radiator hose connects to the engine. The best time to check or change a thermostat is when you are servicing your radiator because you need to drain the cooling system
first. Hence, a thermostat change is a good time to flush and clean your cooling system, check all radiator hoses and the radiator pressure cap. Be sure you have the correct cap on your radiator and it is not rusted. Thermostats are small, inexpensive items. You can test them by heating in water and checking their operating temperature with a thermometer. However it really is quicker and ultimately more reliable to simply fit a new one,
1. thermostat common problems (replace every 50-60k miles)
2. thermostat switch sensor (which turn your cooling fan on and off)
3. check and see if the cooling fans is running when the engine get to its operation temperature. (fan motor can be fault)

Dec 01, 2010 | 1997 Cadillac DeVille

1 Answer

Thermostat housing replacement

These are the steps to replace the thermostat but are applicable to remove and replace the housing also. 2.0L DOHC Zetec Engine WARNING Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

  1. Disconnect the battery ground cable.
  2. Drain the engine coolant to a point below the water thermostat.
  3. Disconnect the connector from the camshaft position sensor.
  4. Remove the bolts and move to one side the water hose connection.
  • Remove the water thermostat and seal from the water thermostat housing.
  • Inspect the seal and the water thermostat.
  • To install:
    1. Replace the thermostat and seal into the housing.
    2. Connect the connector to the camshaft position sensor.
    3. Fill the cooling system.
    4. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
    5. Stop the engine. Top off the coolant recovery reservoir as necessary to maintain minimum cold fill level.

    2.0L SOHC Spi Engine
    1. Disconnect the battery ground cable.
    2. Remove the air cleaner outlet tube.
    3. Drain the engine coolant to a point below the water thermostat.
    4. Disconnect the water temperature indicator sender unit and the engine coolant temperature sensor electrical connectors.
    5. Disconnect the upper radiator hose and the heater coolant hose from the water thermostat housing.
    6. Remove the water thermostat housing bolts, the water thermostat housing, and the water thermostat.
    To install:
    NOTE Make sure all of the gasket surfaces are free of all gasket material. Make sure the tabs on the engage properly into slots in thermostat housing.

    1. Install the thermostat housing bolts, thermostat housing and the thermostat.
    2. Connect the upper radiator hose and the heater coolant hose to the thermostat housing.
    3. Connect the water temperature indicator sender unit and the engine coolant temperature sensor electrical connectors.
    4. Fill the cooling system with only Ford Premium Engine Coolant E2FZ-19549-AA (in Oregon F5FZ-19549-CC, in Canada, Motorcraft CXC-8-B) or equivalent meeting Ford specification in a 50/50 mixture with water.
    5. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
    6. Stop the engine. Top off coolant recovery reservoir as required to maintain minimum cold fill level.

    Dec 07, 2009 | 2000 Ford Escort

    2 Answers

    My VW Cabrio is overheating after 1-2 miles. Coolant in recovery tank is boiling by this time and making bubbling noises. Someone changed radiator hoses, flange, some housing. They are saying that radiator...

    Run the engine and look at the header tank , is there lots of air bubbles coming back out of the water if is then the head gasket may have split and that is down to either a can of Radweld or a strip down repair

    If the radiator is not uniformly hot them I would go for that as your problem

    Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

    So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

    The stat opens and the bottom hose should get hot as the water from the block is pumped into the radiator for cooling.

    The radiator should get hot all over and the cooling fan should kick in when the sensor hits the over limit stop.

    If that does not happen then get someone to remove the stat altogether (It is only there to get the engine block warm quickly in cold regions )

    In which case the bottom hose should go from cold to warm to hot

    Jun 23, 2009 | 1997 Volkswagen Jetta

    4 Answers

    Fans run constantly

    check for a loose connection, could be on the a/c side.. maybe someone pull a wire to change a battery or something check around..

    Feb 15, 2009 | 2001 Buick Regal

    1 Answer

    Only starts on a warm afternoon

    I'm A mechanic. And I was involved in a problem like this. With the same kind of vehicle.
    And Finally a Found the problem. On my Case was the Coolant temperature sensor.

    Maybe on your case is diferent but You don't loss nothing Trying .
    In the morning Try to start the Vehicle if no run.
    Go at front under hood, and disconnect the ECT Engine coolant sensor.
    Is located at the front of the Engine Beside of the Thermostat housing.
    After you disconnect go try to start if run ok. Replace the sensor with a new one.

    I hope this help on your problem.

    Thank you for use fixya...

    Nov 07, 2008 | 1995 Plymouth Voyager

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