why does my subaru overheat without a thermostat

adbcurtis
0

Asked by adbcurtis 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
2,035

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
1,225

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

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

Legacy
Looking for a Used Legacy in your area?
CarGurus has 8,916 nationwide Legacy listings starting at $1,500.
ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Nick Eidemiller
Nick Eidemiller
Reputation 470
#2 dandyoun
dandyoun
Reputation 240
#3 Tom Hawkins
Tom Hawkins
Reputation 220
View All

Related Models For Sale

Used Subaru Impreza"
165 Great Deals out of 11,741 listings starting at $2,999
Used Honda Accord"
1,234 Great Deals out of 68,706 listings starting at $950
Used Toyota Camry"
1,401 Great Deals out of 77,989 listings starting at $1,395
Used Audi A4"
327 Great Deals out of 12,034 listings starting at $1,699
Used Honda Civic"
1,020 Great Deals out of 63,514 listings starting at $1,199
Used Honda CR-V"
735 Great Deals out of 45,124 listings starting at $2,450
Used Volkswagen Passat"
555 Great Deals out of 26,869 listings starting at $1,495
Used Nissan Altima"
1,367 Great Deals out of 87,595 listings starting at $1,500
Used BMW 3 Series"
1,451 Great Deals out of 39,149 listings starting at $1,688

Used Cars For Sale

2015 Subaru Legacy For Sale
6 Great Deals out of 4,703 listings starting at $21,988
2014 Subaru Legacy For Sale
46 Great Deals out of 755 listings starting at $17,795
2013 Subaru Legacy For Sale
39 Great Deals out of 612 listings starting at $12,495
2012 Subaru Legacy For Sale
31 Great Deals out of 561 listings starting at $11,999
2011 Subaru Legacy For Sale
36 Great Deals out of 641 listings starting at $8,750