Question about Subaru Impreza

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Temperature rise Recently my car temperature raise, Mechanic change new thermostat but temperature still the same, rise a bit then fall to middle, and keep on doing the same thing everytime while driving? May I know what causing this and can I not use thermostat. My Impreza model is 2007 ( I think its version 10)

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  • Subaru Master
  • 1,207 Answers

Because the heater is getting cold, that indicates low coolant. It leaked out and the leak needs fixing, but as soon as the engine cools off, refill the coolant and keep it full. Never add coolant to a hot engine without the engine running. Your electric fan might not be working. The fan moved air through the radiator and air circulated the same way when the car is moving. Check that.

If you can see your water pump, feel around the neck of it for moisture. Any moisture there means the pump leaks and needs replacing. Some cars have the water pump behind the cam belt. You can't get to it without a lot of hard work- get that done by a qualified mechanic if you can't find your leak elsewhere, such as a leaking hose or bad radiator cap.

If your electric fan doesn't work, that might be the whole problem. Usually the fan relay fails before the actual fan. Replacing the relay will solve the problem if that's it. Good luck. China OBD2 car diagnostic tools wholesale on CareUCar

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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saberwolf67
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SOURCE: Temp Guage Rises While in Traffic Stop and Go

it seems to me that your fan is not working properly ,check the relay first you might get lucky.if not i would start looking for a bad connection or in replacing the fan

Posted on Nov 23, 2008

  • 124 Answers

SOURCE: Temperature Gauge Always On Cold

As long as your gauge is still moving up, there's no real problem. You have heat coming from the heater. It's only a problem if it's getting too hot. What's going on is that you don't let the vehicle run long enough, and it's so cold outside that the engine stays cold. It raises in temp when your stopped because there's no airflow through the radiator. The thermostat just heats up the engine block, and won't change the reading on the gauge. When this goes bad your car will overheat in just a few miles.

Posted on Mar 26, 2009

tepfy
  • 319 Answers

SOURCE: engine warning light 2004 focus temperature rising

change your thermostat, and your temperature sensor. The sensors can have a tiny crack in them and cause a lot of problems. Once this is done you should notice a difference. Special note, check to ake sure your fan is coming on, and that your water pump is good. Remember if you change your water pump, you must change your timing belt. If you don't you will be replacing them both in under 6 months. Also make sure your coolant is still good.

Posted on Apr 13, 2009

  • 400 Answers

SOURCE: what causes 1991 toyota camry to over heat? we put

Change the radiator cap, it may be the wrong pressure rating which will cause the coolant to boil at a much lower temperature than designed.

Posted on Nov 18, 2009

Mustgo
  • 2359 Answers

SOURCE: my car overheat after radiator overhaul, what else

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Posted on Dec 05, 2009

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