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Weird Overheating Issue
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Old 02-12-2009, 12:25 PM   #21
CatchMyDrift
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I have this same problem with my 96 Impreza L EJ22. I drive my car around town all day with no overheating issues, but once I start climbing a hill on the highway, the temperature starts to creep. I'll give it a nice 6k rev and the temp goes back down to normal. Maybe a min goes by and it does the same thing.

I also get a loss of power and a major raw fuel smell when this happens.

I'll try and get a video up soon.

Parts replaced:

Water pump - 2.5 years ago
Timing Belt - 2.5 years ago
Thermostat - 6 months ago
Radiator - 6 months ago
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Last edited by CatchMyDrift; 02-12-2009 at 12:28 PM.. Reason: added notes
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Old 02-12-2009, 08:27 PM   #22
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CatchMyDrift that sounds a lot like what my car us doing. I'm usually climbing hills here since I live in Colorado. Today I changed the oil in the car and it didn't have anything in it. No milky mayonnaise looking stuff. Everything looked normal. I did jack up the front end, like suggested, and ran the car w/o the thermostat cap on to see what was going on. Once the car got up to temp, the thermostat opened, water pump kicked on, as did the fans. So everything seems to be working right. The coolant level was a little low and once the thermostat opened and water pump kicked on, quite a bit of bubbles came out. So I massaged the coolant lines and added more coolant. Hopefully that's all it was. It just seems weird that it would start doing this out of the blue. I took a 1000 mile trip after getting all the previously mentioned work done and nothing happened then. I am going to replace the thermostat and radiator cap just to be sure, since they are both cheap and in the middle of march I will be making that 1000 mile trip again. Thanks everyone for the help. Any more ideas are more than appreciated.
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Old 02-12-2009, 11:12 PM   #23
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Also, my car started doing this some time after I replaced the water pump.
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Old 02-12-2009, 11:44 PM   #24
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man i hope this isn't a HG problem. I just had my engine pulled to put on a new clutch I'd rather not do it again
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Old 02-13-2009, 02:09 PM   #25
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Well today I picked up a radiator cap and thermostat and installed them. I also put in some of that Subaru Coolant Conditioning fluid. Everything went well. The coolant looked completely fine, no rust or build up. I won't know if it fixed the problem until I go for a longer drive(more than 1 hour). I will let you guys know when that happens. Thanks again.
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Old 02-13-2009, 02:15 PM   #26
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Goodluck
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Old 02-14-2009, 09:59 PM   #27
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Hey guys. I've just experienced the same problem with my Impreza. Driving down the interstate for about 30 minutes, I was surprised by a high temperature reading. It was just above the 2/3rds marker. I pulled off and reduced my speed to 30. The temp dropped quickly to normal. But once I modestly accelerated (3000 rpm), the temp quickly climbed again to almost the 2/3rds mark.

I pulled over and checked to see if I was leaking coolant. I noticed the reserve tank was nearly full, and the coolant was splashed around the reserve tank. No bubbles, but the radiator was making an unusual clunk/pop sound about every 2 seconds. Not the standard tick tick sound as the engine cools down. Checked the reserve tank about 10 minutes later and it was nearly empty.

With some browsing for info, I hope it's not a blown HG. This car is fairly new. Bought it new in 05 and it only has 52k. I find it odd to be a bad water pump, bad thermostat, or a blown HG. The car is parked an hour away, so I'm not able to check for black chips in the coolant fluid until a few days. This is the first time it overheated and I'm not driving it until I have a better understanding of what's going on.

Any opinions would be greatly appreciated! Thanks
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Old 02-14-2009, 10:32 PM   #28
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Try a new rad cap. Cheapest possible thing that can be bad. When mine went my car suddenly overheated after stopping, coolant was overflowing from the overflow tank. You can get the cap pressure tested as well, but they are cheap.
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Old 02-15-2009, 08:21 AM   #29
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When I pulled my engined the coolant was almost brown. It was full of debris and what looked like a ton of rust. Where could that have come from?
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Old 02-15-2009, 09:48 AM   #30
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Quote:
Originally Posted by rage557 View Post
When I pulled my engined the coolant was almost brown. It was full of debris and what looked like a ton of rust. Where could that have come from?
Using the wrong kind of coolant can do it. Subaru radiators are supposedly partial to anything other than "Subaru" fluids.

There is an faq on here that talks about it.
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