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Posted on Jun 10, 2017
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My 98 Forester runs great without a thermostat. When I put a subaru thermostat in and left it idoling for an hour it overheated after I took it for a ride up the road. I thought we got all the air out of it but I read you should park it uphill to make sure you get the air out? I think if it was a head gasket it wouldn't be running great as it is, no oil and water mix or smell. I just need more heat in the bitter cold that is gonna hit New England. Any thoughts?

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Stewart Dibbs

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  • Subaru Expert 415 Answers
  • Posted on Sep 08, 2017
Stewart Dibbs
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Getting all the air out is actually quite simple. Fit the thermostat. Make absolutely sure you know which way it goes in: ask the dealer if you are unclear. Put it in backwards and it does not work properly. Fill the radiator, and start the engine and let it idle. In about 5 minutes, the thermostat will open and the coolant level will go down. Stop the engine, fit the cap and top up the coolant. Now, squeeze the top hose, say, 10 times: you'll hear the coolant gurgle a bit. Remove the cap and top up the coolant. Start the engine and repeat. Eventually the gurgling will stop and all the air is out of the engine. Usually takes 2 or 3 iterations.

Do the final top up and take it for a run.

5 Related Answers

Anonymous

  • 10 Answers
  • Posted on Jan 23, 2010

SOURCE: Subaru Forester 1999 GLS spark plug gap?

spark plug make= ngk
plug type =BKR6E-11
GAP=1.1mm A TURBO MODEL WILL BE 0.7-0.8 MM GAP

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Anonymous

  • 119 Answers
  • Posted on Jul 14, 2009

SOURCE: subaru forester heater

take back to the dealer,hopefully the will find that the blend door cable is off or not adjusted properly

Anonymous

  • 10 Answers
  • Posted on Mar 16, 2010

SOURCE: 2000 subaru forester ignition coil wiring

Are there any other possible problems, or you are just not receiving spark at all now?

The coilpack could be dead and just need replaced. If you have a voltmeter or a test light, check the wiring on both sides of the coilpack harness to make sure it is receiving power.
I don't believe Subaru used ignitors past '99, but if they did, your should be located on the firewall behind the throttle body. Make sure it's plugged in and receiving power.

Coil packs do go bad from time to time. I had to replace mine in my
'98 Impreza a while back.

Goodluck!

Anonymous

  • 6 Answers
  • Posted on Jul 11, 2010

SOURCE: subaru forester 2001 has a slow acceleration.

how many mile is on the car it could have a bad muffler or possibly need a tune up

Anonymous

  • 1586 Answers
  • Posted on Jul 14, 2010

SOURCE: Subaru forester PO 171 code

Your fuel system is too lean. It's typically the primary O2 sensor (on the pipe between the engine and the catalytic converter). The mass airflow sensor is also possible but the O2 sensor is a wear item requiring periodic replacement and is more likely.

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1998 Subaru Forester

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