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Old 08-19-2003, 10:10 AM   #1
NicEJ25
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Default 2.5 overheating, dunno what to do, please help !

I'm having problem with the 2.5 i put in my 93 impreza. the engine was OK before I did the swap, and now it's overheating. The head gaskets has been done, thinking it was the problem, and it was not. the thermostat is new, the radiator cap is new. what I can see is that, while the engine is running, air is getting in the system, forcing the coolant to get in the overflow tank, and when the tank is full, it's going out of the overflow tank. before I get the head gasket done, it was doing a weird thing when I would shut-off the engine while it was hot. after a few minute, the upper radiator hose was constricting, and the overflow tank was returning is the system after a few violent hose acting. after the head gasket has been done, It did not seem to do the upper hose thing, but I can see the lower hose is constricting while I rev up the engine, and I suppose no or little coolant can get thru the hose then. what the hell is going on ???? I'm supposed to do a pressure test in the cylinder soon. no crack where visible in the combustion chamber nor the cylinder liner when the engine was dissasembled
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Old 08-19-2003, 10:15 AM   #2
orndog
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What did the 2.5 come out of? I have no clue, but maybe it is one of those that does the reverse flow coolant thing?
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Old 08-19-2003, 10:58 AM   #3
9
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well if it came out of a 98, then most likely its the head gaskets. Did you do the head gaskets your self? I had to a while back and subaru was giving out faulty head gaskets. If you can remember if they were a 3 ply head gasket, then they are defects, you need to get the newer 4 ply ones. But when the 98's have a blown head gasket, water doesn't go into the cylinder, the piston forces part of the exaust into the cooling system. Hope that helps.

Courtney
(still a newbie for some d*** reason)
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Old 08-19-2003, 03:37 PM   #4
NicEJ25
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the 2.5 come from a 2001 impreza RS. the head gasket had just been done my the dealer were i was working this summer. the head got shaved, they were out of tolerance
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Old 08-19-2003, 07:21 PM   #5
atmosphere
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Well seeing as how the DOHC have the greater chance of a blown headgasket and you have a SOHC, this may not be your problem. You may have a cracked block. For future reference post a topic of this nature in the Service & Maintenance forum.
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Old 08-20-2003, 01:49 AM   #6
Patrick Olsen
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I'll be honest, I don't know what the problem is, but I don't think it's the things suggested above. The symptoms that you've observed indicate there's something wrong with the cooling system. The hoses themselves could be to blame - I've always been told that if the hoses collapse in like that that it means they need to be replaced. Perhaps the upper hose was replaced (which is why it doesn't get sucked in any more) but the lower one wasn't so now it's the weak spot in the system?

The other thing I would check is to be sure the system was properly vented while filling so that there aren't any air pockets.

Last but not least, what radiator are you using in the car - the stock '93 one, or the one from the '01 donor car. If it's the former, it might not be big enough for the bigger engine, which could be causing the overheating problem.

I'd replace the hoses first if it were my car.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 08-20-2003, 03:35 AM   #7
scoobynation
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one other idea that it might be is have you checked your water pump cuz if it is not workin efficently it would make you car overheat although i dont know why you hoses are colapsed but it might be this with a combonation of things....good luck

sean
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Old 08-20-2003, 11:43 AM   #8
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Well, deffinately try the cheap options before you go do something expensive. But just remember that our engines are all aluminum and they warp and can crack easily.
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Old 08-20-2003, 06:31 PM   #9
sen
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Unhappy Head Gasket

I had the same problem two years ago. Open you radiator an see if you smell exhaust. You can also have the radiator fluid tested at a dealer.

Good Luck.

SEN
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Old 08-22-2003, 04:48 PM   #10
NicEJ25
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I removed and dissasembled the radiator and it was in fault. there were only 8 out of the 40-50 cooling lines that were flowing. so it cost me an head gasket bcuz of this radiator !"!/"/
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