why is my car filling up the reservoir tank?

Asked by Mar 23, 2015 at 04:10 PM about the 1997 Subaru Legacy 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

It used to over heat only in the mornings after having driven it for about ten minutes and I would take off the radiator cap and fill up the radiator and the reservoir tank would be filled up completely, after that it would be fine for the rest of the day until the nest morning.
It seems that it overfills the reservoir tank and looses coolant though there.

4 Answers

63,355

Bad thermostat,or water pump.

Ok thank you. I thought it could be that but read that it could be a blown head casket it that likely? It did over fill the reservoir once after having it driven for about more than an hour but I just did the same thing of removing the radiator gap and refilling it and it was fine the rest of the trip

7,255

The blown head gasket is still a possibility, cylinder pressure could be pushing coolant up into the reservoir

20

You need a new radiator cap, and hose going to the overflow. The valve is stuck, and won't reverse pressure, or there is a clog in the hose that dislodges one way but sticks going the other way. by removing the radiator cap, the pressure was able to equalize which is why it was fine for the rest of the trip. I recommend flushing the coolant system afterwards to clear any debris that might be in there.

Your Answer

Add photo

Related Questions

  • Why is coolant in my radiator filliing up my overflow tank 2 answers

    my subaru starts getting hot after 2 or 3 weeks. coolant goes into overflow tank. Does anyone out there know why? Is it my radiator cap? Thermastat?

    1990 Subaru Legacy 4 Dr L AWD Wagon

    -

    Maintenance & Repair

  • Cooling system / radiator fans 16 answers

    So yesterday I was driving back from the store and driving about 25 to 35 mph. I stopped at the gas station on my way home and noticed steam coming from my engine. When I popped my hood my radiat...

    2005 Subaru Legacy 2.5i

    -

    Maintenance & Repair

  • 99 LEGACY OUTBACK WON'T START AFTER FILLING 1 answer

    , REGARDLESS OF HOW MUCH FUEL IS IN THE TANK, UNLESS YOU GIVE ABOUT HALF THROTTLE AND CRANK FOR ABOUT 10 SECONDS. FUEL PRESSURE IS GOOD, GAS CAP IS GOOD. ALSO, IF I LEAVE THE CAR RUNNING WHILE FUELI...

    1999 Subaru Legacy 4 Dr Outback Limited 30th Anniversary AWD Wagon

    -

    Maintenance & Repair

  • Why is my subaru still overheating 13 answers

    I have a 99 subaru legacy 2.5 gt and its been overheating lately... I changed out the radiator bc it was leaking, then changed out the thermostat, only to find out there was a leak in one of the sma...

    1999 Subaru Legacy 4 Dr 30th Anniversary AWD Sedan

    -

    Maintenance & Repair

  • How can I get the dash computer to report accurate gas volume after fill up? 1 answer

    My 2016 forester has 5000 mi and up until my last 2 fill ups it reported the accurate gas volume 390 miles. The dealer told me it is normal. Why did it work correctly for the first 5000mi? They told...

    2016 Subaru Forester 2.0XT Premium

    -

    Maintenance & Repair

Legacy

Looking for a Used Legacy in your area?

CarGurus has 16,711 nationwide Legacy listings starting at $1,300.

ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Anthony_60
Anthony_60
Reputation 1,230
#2 Nick Eidemiller
Nick Eidemiller
Reputation 690
#3 dandyoun
dandyoun
Reputation 650
View All

Related Models For Sale

Used Subaru Impreza
188 Great Deals out of 17,141 listings starting at $1,800
Used Subaru Forester
325 Great Deals out of 27,634 listings starting at $1,995
Used Honda Accord
788 Great Deals out of 88,192 listings starting at $1,150
Used Toyota Camry
847 Great Deals out of 90,973 listings starting at $249
Used Honda Civic
516 Great Deals out of 89,847 listings starting at $1,299
Used Toyota Corolla
714 Great Deals out of 73,207 listings starting at $1,950
Used BMW 3 Series
967 Great Deals out of 33,687 listings starting at $1,000
Used Nissan Altima
878 Great Deals out of 80,282 listings starting at $1,800
Used Acura TL
236 Great Deals out of 6,941 listings starting at $1,200

Used Cars For Sale

2017 Subaru Legacy For Sale
9 Great Deals out of 11,003 listings starting at $19,665
2016 Subaru Legacy For Sale
55 Great Deals out of 838 listings starting at $11,995
2015 Subaru Legacy For Sale
53 Great Deals out of 958 listings starting at $10,700
2014 Subaru Legacy For Sale
44 Great Deals out of 1,112 listings starting at $8,999