Overheating at high speed / rpm

Asked by May 30, 2017 at 04:46 PM about the 1998 Subaru Impreza 4 Dr Outback Sport AWD

Question type: Maintenance & Repair

I own a 98 subaru impreza outback with 130k miles. It was running great until I
recently started a longer highway commute.
Overheating only seems to occur after the car has been driving for a while, and
at rpms above 3.5k (ish), ie. when accelerating to merge or driving up a hill.
I have a feeling it might be a head gasket leak, but am unsure, I just replaced the
oil and didn't notice any white coloration.
Since I noticed the issue I've been keeping my car under 3.5k rpm, but as soon
as I accelerate above that the thermostat pings to nearly max then back down to
middle repeatedly, it will middle out after a while of lower rpm driving.

Are there any additional ways to check if it might be the head gasket?


1 Answer


Do a complete cooling system service and hope that it fixes your problem - hoses, flush, new coolant and thermostat. If the water pump is worn out it is a fairly big job to replace.

Your Answer


Looking for a Used Impreza in your area?

CarGurus has 21,057 nationwide Impreza listings starting at $1,333.


Subaru Impreza Experts

  • #1
  • #2
  • #3
    Nick Eidemiller
View All

Related Models For Sale

Used Subaru Legacy
160 Great Deals out of 14,047 listings starting at $1,250
Used Subaru Forester
310 Great Deals out of 36,267 listings starting at $999
Used Honda Civic
398 Great Deals out of 52,417 listings starting at $1,200
Used Honda Accord
592 Great Deals out of 92,755 listings starting at $1,495
Used Toyota Corolla
715 Great Deals out of 67,521 listings starting at $1,599
Used Toyota Camry
890 Great Deals out of 73,116 listings starting at $1,400
Used Honda CR-V
617 Great Deals out of 67,194 listings starting at $1,800

Used Cars For Sale

2017 Subaru Impreza For Sale
47 Great Deals out of 1,656 listings starting at $14,991
2016 Subaru Impreza For Sale
17 Great Deals out of 525 listings starting at $12,490
2015 Subaru Impreza For Sale
41 Great Deals out of 1,107 listings starting at $9,995
2014 Subaru Impreza For Sale
14 Great Deals out of 451 listings starting at $8,450
2013 Subaru Impreza For Sale
10 Great Deals out of 404 listings starting at $6,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.