Question about 2001 Subaru Legacy

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Overheating, top hose hot, bottom hose cold.

The thermostat has already been replaced, and there was a coolant flush on it. It was also checked for a bad head gasket but it was all fine. Coolant in reservoir is not being sucked in. And I DO have heat.

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  • Subaru Master
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Did you flush the radiator as well? On a hot engine, the bottom hose should be more than cold, at least pretty warm. Check for radiator blockage.
Correct mixture of anti-freeze and water?
Was the coolant system pressure tested? The system holding a pressure of about 15 psi, is what makes the coolant return from the reservoir. Like this: When engine is shut off, the hot coolant contracts as it cools. So the level in the radiator drops a little. If the system is sealed, this creates a vacuum in the top of the radiator. The vacuum sucks the coolant back into radiator through the reservoir return hose. The radiator cap seal should hold the pressure in. But if there is a leak somewhere, the pressure will not hold. Coolant under pressure raises it's boiling point by an additional 10-15 degrees.
So I would check the radiator, and have a simple pressure test done (if you haven't already).

Posted on Nov 27, 2013

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  • Subaru Master
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How's the water pump?

Posted on Nov 27, 2013

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Posted on Jan 02, 2017

SOURCE: '97 subaru overheating

head gasket most likely.

Posted on Aug 31, 2008

  • 507 Answers

SOURCE: 2003 subaru legacy- loosing coolant and apparent

check oil colour(milky indicates water)check radiator,can you smell fumes in there,get it tested with and exhaust gas annaliser,which picks up engine fumes in the radiator if you cant tell for sure,it does sound like you have a head gasket problem,you would need to do both heads not 1

Posted on Oct 29, 2009

  • 1 Answer

SOURCE: 1995 legacy 250t wagon - overheating

Sometimes after changing the coolant, people (like me) decided to fill the radiator ... only to find the car overheated like a candle.
When you fill the car, DO NOT fill the radiator first. Pull the top hose off, and fill the engine (via the hose) with coolant. Once that's full, shove the hose on and then top off the radiator.
Solved the problem for me. Has never overheated since.

Posted on Dec 26, 2009

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===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

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===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

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Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
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If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

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Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
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