i have a 2004 outback 3.0 that started overheating 3 days after i purchased it. I had the obveous replaced; heat sensor. radiater cap. When I went to rewplace the thermostate I found that it had been removed. Put in an after market therm and it didn;t change situation. I replaced water pump. That didn't work. Situation now is that the two upper hoses get hot quickly and are under pressure; lower hose is much cooler and not pressureized.Logic dictates either a bad therm (but it overheated even when the therm was removed) or a bad radiator (but the radiator seemed to pass water freely when I had it out. I understand there is a chemical that detects carbon in cooling system. Seems that should be my next step to rule out hg. I also understand that heater plays a roll in cooling system but not sure how much it would effect water temp and pressure. Any suggestions would be appreciated

Asked by Mar 19, 2016 at 09:45 PM about the 2004 Subaru Outback H6-3.0 L.L. Bean Edition Wagon

Question type: Maintenance & Repair

started overheating. I replaced heat sensor, radiator cap. Went to replace
therm. but found it
didn't have one. Did relace it with a non subaru therm. Didn't solve problem
so replaced water pump. Also didn't solve problem. Current situation is that
the top two hoses heat up and pressurize very quickly while the bottom
stays cool and non pressurizes. At this point the engine is still cool to touch.  
I understand there is a hg problem with Subaru engines so I am getting the
chemical that will show if there is carbon in your cooling system. I also
understand that the heater core is a part of the cooling system. Don't know
if it would cause this problem. Radiator seems like a logical fix except I ran
water through it and it flowed smooth and clean. Any suggestions would be
greatly appreciated.

1 Answer

14,145

Subaru's, I understand, use a special oversized thermostat, so, using the aftermarket unit was probably a mistake. Cooling is a big part of the car, and I would not advise fooling around with this, otherwise, you could overheat and blow the head gaskets. That would be VERY expensive.

Your Answer

Add photo

Related Questions

Search Subaru Outback Questions

Subaru Outback Experts

#1 Markw1952
Markw1952
Reputation 4,720
#2 FordNut
FordNut
Reputation 1,490
#3 TheSubaruGuruBoston
TheSubaruGuruBoston
Reputation 1,360
View All

Related Models For Sale

Used Subaru Forester
374 Great Deals out of 21,183 listings starting at $1,290
Used Subaru Legacy
247 Great Deals out of 17,066 listings starting at $1,300
Used Subaru Impreza
204 Great Deals out of 7,919 listings starting at $1,795
Used Honda CR-V
1,316 Great Deals out of 73,649 listings starting at $1,118
Used Toyota RAV4
1,148 Great Deals out of 55,710 listings starting at $1,999
Used Toyota 4Runner
406 Great Deals out of 20,535 listings starting at $2,499
Used Toyota Highlander
693 Great Deals out of 27,882 listings starting at $2,988
Used Toyota Tacoma
799 Great Deals out of 33,979 listings starting at $2,499
Used Jeep Grand Cherokee
1,162 Great Deals out of 70,568 listings starting at $495
Used Honda Accord
1,258 Great Deals out of 78,204 listings starting at $969
Used Toyota Camry
1,524 Great Deals out of 101,099 listings starting at $700
Used Subaru Impreza WRX
49 Great Deals out of 1,283 listings starting at $1,999
Used Ford Escape
1,728 Great Deals out of 86,325 listings starting at $995

Used Cars For Sale

2017 Subaru Outback For Sale
21,010 listings starting at $23,756
2016 Subaru Outback For Sale
27 Great Deals out of 850 listings starting at $22,126
2015 Subaru Outback For Sale
80 Great Deals out of 1,415 listings starting at $14,995
2014 Subaru Outback For Sale
91 Great Deals out of 1,743 listings starting at $10,495
2013 Subaru Outback For Sale
47 Great Deals out of 1,194 listings starting at $8,970