i recently replaced the head gaskets in my 2001 subaru outback it ran great for a week and half now it over heats it does not boil over temp gage just goes to red after drivein about 7 minutes

Asked by Nov 07, 2015 at 02:13 AM about the 2001 Subaru Outback Limited Wagon

Question type: Maintenance & Repair

recently replaced the head gaskets ran great for week and half now temp gage is going to red after driving a few miles it does not boil over or steam and no oil in antifreeze or antifreeze in oil im clueless  I have replaced the thermostat any help greatly appreciated as I cannot afford a new car thanks in advance

6 Answers

103,925

Make sure the cooling fans are working. Did you flush out the engine after the head gaskets were replaced?

1 people found this helpful.
7,580

BE ABSOLUELY SURE that your "replacement" t-stat was either OE or same big orifice as OE. Smaller bore aftermarket t-stats are infamous for restricting coolant flow under load (hills or high speed), causing overheating under stress. As likely, you have an errant air buble in the system that occasionally "settles" near the temp sensor, momentarily causing it to spike upward. So when cold, see if you can add coolant to radiator; squeeze upper hose to help purge its volume. Even park with front HIGHER, so that trapped air in rear heater hoses also "burp" forward and upward and eventually escape through the rad cap. Note that some of us have had to "burp" trapped air several times after changing coolant. A decent highway run between purging sequences helps dislodge trapped air pockets. So ensure your cooling system is fully purged. If there's still an overheating problem, check that "new" t-stat (interestingly, the big OE t-stts NEVER fail!). If still problematic I'd fear a blocked passage, so BACK-FLUSH those rear heater hoses in case they're blocked with old scale particles. If none of this works, and coolant flow seems normal, then I'd start to look at the quality of the HG job (loose head bolts, failure to "tank" and "plane" the heads at a machine shop, resulting in poor sealing, etc. Good luck...I'll bet you're just insufficiently purged, have a small t- stat, or blockage in the hoses or rad from a goopy additive or scale...simpler stuff.

1 people found this helpful.
7,580

Oh yeah...make sure the fans work. Thanks FoR!

1 people found this helpful.

the fans are working could it be the head gasket even if there are no oil antifreeze mix??? and is it normal to run perfect for a little over a week and have air bubbles?? its pushing the antifreeze out in to the overflow

7,580

It can be "normal" for trapped air bubbles to percolate out of the coolant through the expansion tank, but that should subside as the system self-purges. If not, I suspect a head gasket gap allowing pressurizing the coolant FROM the combustion chamber TO the coolant bath...and not involving coolant/oil interface. Have a wrench use a sniffer to differentiate air bubbles from HC- infused exhaust gases at the radiator neck while hot-idling and occasional revving to produce bubbles (have AC on so that cooling fans keep system isothermal so that coolant level stays relatively stable so you can watch activity at the neck; use a tight funnel mounted into the rad neck and slightly overfill with water/coolant to provide a nice wide viewing "puddle" to watch/sniff bubbles. Good luck.

26,745

boxerluver76- Don't be afraid to consider taking the car to a good independent mechanic, if nothing more than to check out your systems and make sure things are back to normal. I'm sure that your 2001 Subaru Outback Limited is nice and you want to get that back on the road with no problems? Do you have the automatic or manual transmission? And, do you have a lot of miles on this car?

Your Answer

Outback

Looking for a Used Outback in your area?

CarGurus has 39,328 nationwide Outback listings starting at $1,500.

ZIP:

Subaru Outback Experts

  • #1
    Markw1952
    Reputation
    10,400
  • #2
    TheSubaruGuruBoston
    Reputation
    3,660
  • #3
    F_O_R
    Reputation
    3,550
View All

Related Models For Sale

Used Subaru Forester
252 Great Deals out of 34,359 listings starting at $1,495
Used Honda CR-V
479 Great Deals out of 72,005 listings starting at $1,300
Used Subaru Impreza
176 Great Deals out of 21,588 listings starting at $1,919
Used Subaru Legacy
150 Great Deals out of 12,875 listings starting at $1,240
Used Toyota RAV4
425 Great Deals out of 74,147 listings starting at $1,995
Used Toyota 4Runner
281 Great Deals out of 32,848 listings starting at $950
Used Toyota Highlander
380 Great Deals out of 48,090 listings starting at $1,500
Used Toyota Tacoma
439 Great Deals out of 44,078 listings starting at $1,995
Used Honda Accord
424 Great Deals out of 101,059 listings starting at $1,200
Used Toyota Camry
761 Great Deals out of 70,900 listings starting at $1,200
Used Jeep Grand Cherokee
831 Great Deals out of 75,648 listings starting at $899
Used Ford Escape
975 Great Deals out of 108,545 listings starting at $850

Used Cars For Sale

2018 Subaru Outback For Sale
16 Great Deals out of 28,442 listings starting at $22,094
2017 Subaru Outback For Sale
72 Great Deals out of 2,535 listings starting at $20,465
2016 Subaru Outback For Sale
39 Great Deals out of 1,325 listings starting at $11,995
2015 Subaru Outback For Sale
46 Great Deals out of 1,732 listings starting at $10,888
2014 Subaru Outback For Sale
22 Great Deals out of 940 listings starting at $7,451

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.