why does my subaru overheat without a thermostat

adbcurtis
0

Asked by Oct 26, 2013 at 06:01 PM about the 1996 Subaru Legacy 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

bought it a week ago  ...prev owner had some overheat trouble...it seems that it does it for a bit then has no prob then does it again

3 Answers

madmopar
3,025

your car overheats without a thermostat because the water is continuously circulating. when a working thermostat closes, it allows the water to stay in the radiator long enough to cool down. when the temperature in the engine gets hot, the thermostat opens and allows the cooler water in the radiator into the motor and the warmer water from the engine goes into the radiator to be cooled.

Garrett White
75

That's not how thermostats work. Too much water flow only slows down proper warmup. The water doesn't need to sit in the radiator to cool sufficiently unless there is something wrong with the radiator. Your issue is likely somewhere in the radiator. Are the fans working properly? Is there a blockage, like leaves our other debris, preventing proper airflow through the radiator fins? If all of that is ok then your problem is either in the radiator, something preventing sufficient water flow to cool off the engine, or elsewhere in the cooling system causing the same issue. If nothing is reducing the airflow then get the cooling system flushed and replace that thermostat with a correctly rated one.

Jeff Smith
2,135

It's likely that the overheating is due to a blown head gasket.

4 out of 4 people think this is helpful.

Your Answer

Add photo

Related Questions

Legacy
Looking for a Used Legacy in your area?
CarGurus has 11,574 nationwide Legacy listings starting at $1,995.
ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Nick Eidemiller
Nick Eidemiller
Reputation 610
#1 Anthony_60
Anthony_60
Reputation 610
#3 dandyoun
dandyoun
Reputation 460
View All

Related Models For Sale

Used Subaru Impreza"
157 Great Deals out of 10,703 listings starting at $1,500
Used Honda Accord"
661 Great Deals out of 72,281 listings starting at $999
Used Toyota Camry"
1,002 Great Deals out of 76,491 listings starting at $1,000
Used Honda Civic"
557 Great Deals out of 60,488 listings starting at $1,600
Used Acura TL"
204 Great Deals out of 6,523 listings starting at $1,998
Used Nissan Altima"
875 Great Deals out of 84,755 listings starting at $950
Used Audi A4"
281 Great Deals out of 11,712 listings starting at $2,000
Used BMW 3 Series"
1,133 Great Deals out of 41,113 listings starting at $1,350

Used Cars For Sale

2016 Subaru Legacy For Sale
6 Great Deals out of 6,050 listings starting at $19,997
2015 Subaru Legacy For Sale
63 Great Deals out of 1,028 listings starting at $17,995
2014 Subaru Legacy For Sale
42 Great Deals out of 852 listings starting at $10,995
2013 Subaru Legacy For Sale
33 Great Deals out of 1,046 listings starting at $10,900
2012 Subaru Legacy For Sale
24 Great Deals out of 516 listings starting at $8,999