Why is our 2000 subaru forestor's temperature up sometimes and not other times?

Asked by Jul 20, 2017 at 08:02 PM about the 2000 Subaru Forester

Question type: Maintenance & Repair

Our car has been practically rebuilt in recent weeks, but the temperature gage
continues to show the car running hot sometimes, and then the needle will go
up and down.  The head gasket, thermostat, as well as several other this gas
have been changed and nothing seems to fix this,  

There is no smoke, steam, or what usually happens with a car running hot m
Please help!

8 Answers

86,185

I would suspect air in the system, a bad thermostat or cooling fans that are not working.

6,170

I initially suspect F_O_R's door number 1. When a migrating gas bubble sits adjacent the coolant temp sensor it'll spike temporarily. Elevate the front of the car a bit and have a careful purge done before spending more on parts.

Thank you for this information. One other concern is that when I accelerate the temperature will go back into the normal temperature range but also when I am at a stop light, In park, and rev the engine without moving, the temp will drop back to normal on the gouge.Your thoughts on that.

86,185

Perhaps the water pump is worn and not circulating the water as it should.

6,170

Subie's WPs are pretty golden, so I'm still with yoiur Door Number One. 96nyx: you mistyped "normal" twice; regardless, the temp gauge "pumping" is because of trapped air in coolant. Bleed the system carefully. If it won't stay bled check for outgassing because of blown head gasket. See other long threads for procedure.

Thank you for your solutions. The head gasket was changed, the water pump was changed, and the thermostat was changed twice, as well as the radiator, and cap, and the fan was working properly. Prior to the repairs being done the Temp gauge was fluctuating after warm up and driving as well as after repairs. I stupidly added head gasket sealant and followed the direction meticulously,before the repairs were made. One other symptom is I hear a 'gurgling' sound behind the A/C vents in the dashboard even without turning on the A/C. After repairs were made a po 443 Evap control solenoid error code kicked out from a check engine light that came on after repairs were done. Not sure if the last two items are pertinent to the cooling system problem. Thoughts on this. Thank you.

86,185

Gurgling sounds = air in the system.

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6,170

Yup...sounds like an incomplete purge. Here's a weird one that you nay have contributed to via the sealant: try BACK-FLUSHING the rear heater hoses with a garden hose to clear any blockage therein. Fairly rare, but I've run into it a couple of times. With a new radiator I wouldn't expect much crap to be sloshing around there, but a solidified blockage in the rear heater hoses can cause the symptoms you describe...as would a too-small aftermarket thermostat, so check that a large-orifice OE size one was installed.

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