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Old 07-12-2005, 10:28 AM   #1
slikrik05
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Exclamation 2000 Impreza 2.5RS Overheating

My 2.5RS is overheating but at very strange times. After running for about 5 minutes, the temperature begins to increase on the thermometer. However, if I blast the heat on high, and keep the engine ABOVE 2800 rpm, then the engine stays at normal temperature. However, if I drop the engine below 2800 rpm, the engine begins to overheat. This may have to do with the fact that when I drive at higher rpm's, the heater gets stronger and much hotter thus dissipating more heat from the engine, but I still have no idea why the car is overheating.

Can anyone help me out.

Thanks
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Old 07-12-2005, 10:59 AM   #2
Siper2
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Engine fan working?
Coolant level normal?
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Old 07-12-2005, 11:37 AM   #3
cakes25rs
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Quote:
Originally Posted by slikrik05
My 2.5RS is overheating but at very strange times. After running for about 5 minutes, the temperature begins to increase on the thermometer. However, if I blast the heat on high, and keep the engine ABOVE 2800 rpm, then the engine stays at normal temperature. However, if I drop the engine below 2800 rpm, the engine begins to overheat. This may have to do with the fact that when I drive at higher rpm's, the heater gets stronger and much hotter thus dissipating more heat from the engine, but I still have no idea why the car is overheating.

Can anyone help me out.

Thanks
get it checked out...my old RS started doing that, next thing you know I had blown head gaskets which resulted in a new block covered under warranty. there was a recall for head gasket issues which extended the warranty for problems that occured due to this until 100k...

l
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Old 07-12-2005, 11:54 AM   #4
shoeler25
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Ill second Siper, since those are the 2 things responsible for keeping the engine cool while stopped at a light or when not much air is flowing through the bay.
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Old 07-12-2005, 12:25 PM   #5
joubtt
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I 2nd cakes25rs; it happened to me.
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Old 07-12-2005, 01:40 PM   #6
CLOVER5379
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Yeah check the fan to make sure it's working. I had that problem with a car one time. You may as well flush the whole system out while your at it just to get everything tip top. Hope it's something simple.
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Old 07-12-2005, 02:02 PM   #7
Matt Monson
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If the fans aren't kicking on, it is likely a bad thermostat. You will want to check that after you test the fans. But it makes sense that it will cool better when the heat is on since it is running coolant through the heater core, and blowing air across it. I think your thermostat is most likely stuck...
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Old 07-12-2005, 02:07 PM   #8
amorton
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It sounds like the thermostat is stuck open, It allows too much watter to flow through the block, The watter does not displace enough heat, which causes the temp to go up at low RPM, At higher RPM 2800+ in your case, the watter pump is flowing a lot faster you are still overheating the block but more cool watter is getting to the temp sensor giving the appearance of a lower over all temp. Most thermostats are designed to fail in the open position. I could be wrong, but it sounds a lot like this.
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Old 07-12-2005, 03:03 PM   #9
slikrik05
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The fan is working (I can hear it when I turn off the engine) and the coolant level is normal, therefore I believe it could be what amorton believes it to be, a thermostat problem.

How much do you think it would cost to get this fixed at the dealership?
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Old 07-12-2005, 03:18 PM   #10
amorton
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You can test test thermostat, I took a pic of the service manual page for you. It is really not hard, the part is cheap, and the dealer will be in the $100 range I am guessing.



hope this helps
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