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ej2
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1,226 Posts
Discussion Starter · #1 ·
Thermostat is about 2 years old.
Radiator is about 6 years old.
Just changed the radiator cap 2 weeks ago.
Just bled the system 2 weeks ago.
Not leaking from water pump, or radiator.
No milky oil, or residue in radiator/reservoir.
No white smoke. Heater blows hot.

My driveway has an incline. Backing down the incline I noticed the gauge went up. Driving uphill also cause this same effect. Idling made it go down.

However, driving down the road without the a/c on, everything is fine. That's how I made it home from school : ) :willy_nilly:

Any help?
 

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6,805 Posts
one of a few things

-radiator is partially clogged, leading to higher temps under more engine load
-coolant is low, whether from a clogged radiator blocking access to some surface area of radiator (but still appearing full)
-water pump is giving up and not pushing as much coolant as it should be (rusting away impellers possibly)
-or a very rare one, your ignition timing is severely retarded and not advancing like it should. Generally you would notice this as have very sluggish high rpm power
 

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BATSLOMAN GIVES NO FUCKS.
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5,024 Posts
get a coolant pressure tester and see if it holds pressure to weed out any leaks. then flush the radiator
 
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