1998 SUBARU OVERHEATING!!!

  • Tiny
  • deepeyes1000
  • 1998 Subaru

Hi,
My 1998 Subaru Outback Legacy 2.5l EJ25 has about 126,000 miles on it. One day the car mysteriously began to overheat. Since then I have replaced the radiator, radiator cap, both upper and lower hoses, the thermostat (twice - second time with the Subaru brand), and the temperature gauge's sending unit. The only thing that I have not replaced on the car is the water pump. The car runs fine for about 20 to 30 miles and generally runs fine when I'm up to speed (around 50 to 60 mph). However, when I slow down or am stopping the temperature gauge will rapidly shoot up close to the red zone, and will then rapidly shoot down to normal operating temp when I accelerate. I have had the car tested for head gasket problems as well (hydrocarbon testing, leakage testing, and compression testing - all turned out negative). I'm currently at my wits end at trying to fix the problem and have been trying to avoid a costly repair. Thanks for your response!

Thursday, July 26th, 2007 AT 5:51 PM

3 Answers

  • Tiny
  • mhpautos
  • Expert
  • 29,864 posts

Hi there,

Are the cooling fans cutting in at the right temp? If the temp is in the high zone and no fans are on it's a fair chanche that the fan temp sensor is faulty.

Mark (mhpautos)

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Thursday, July 26th, 2007 AT 9:37 PM
  • Tiny
  • deepeyes1000
  • Member

Oh yes, I forgot to mention that little bit of info. The cooling fans have been cutting on at the appropriate temp.

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Thursday, July 26th, 2007 AT 11:15 PM
  • Tiny
  • M_H_RITZEL
  • Expert
  • 2,768 posts

Try back flushing the system. Check the belt to make sure it is tight. With everything you have done it could be a clogged system that is not letting the anti freeze circulate enough to cool it.

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Monday, July 30th, 2007 AT 10:53 AM

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