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Guest Message by DevFuse

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1990 legacy overheat problem

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8 replies to this topic

#1 danley


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Posted 02 February 2004 - 04:49 PM

well....ive got a 1990 legacy 2.2 fi.......with a problem.......i rebuilt heads( they had to weld due to some pretty bad electrolosis)......installed by the book......new radiator as old was clogged, new hoses, new 170 thermostat......new 13 lb cap......flushed etc......water jackets clear, & water pump appears to work.......i live @ 5700+ ft, drive it for about 15 @ 60mph, then find coolant down about 1 1/2" in rad, it never drops lower than that. when i slow down from 60 temp goes up to just under overheat........rev motor it cools down, if i drive in 2nd for a bit it cools down to normal. if i take car to sea level or so......it runs fine doesn't lose water or overheat.........does anyone have any ideas? 18 lb rad cap? help!!! thanx in advance dan

#2 SevenSisters


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Posted 02 February 2004 - 06:15 PM

Are you saying that you find the radiator 1.5" low, refill it and find it low again?
It does'nt do this at sea level only mile high?
What's happening in your coolant overflow tank? Level goes up when hot? Goes down when cool? Any oil or bubbles?

You may be blowing hot coolant into the overflow tank and not sucking it back into the radiator when it cools.

#3 danley


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Posted 03 February 2004 - 06:41 PM

yep no oil or bubbles.....iv'e double checked evrything....coolant is getting sucked right back.....really weird.....never had a prob like this in the 30 or so older cars iv'e owned over the years.....gonna recheck the lower hose.....but......not drips either...... thanx, dan pearson

#4 danley


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Posted 03 February 2004 - 06:42 PM

forgot to finish last post.......yep only at mile hi......... dan

#5 lmdew



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Posted 03 February 2004 - 09:40 PM

I'd make sure the fans are working when they should.

#6 DerFahrer


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Posted 04 February 2004 - 12:07 AM

A friend with a 90 Legacy blew hig HG's and he also rebuilt the heads.

He said when he reinstalled them, he had to keep after the coolant and had bubbles simply because there was so much air in the coolant passages in the heads from taking them off. It takes time to refill them...

#7 Setright


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Posted 04 February 2004 - 03:41 AM

Yep, make sure you bleed and re-bleed the system. I can take many miles, like hundreds. Even if all you do is drain the system, nevermind taking the heads off.

#8 Legacy777



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Posted 04 February 2004 - 09:28 AM

there is a bleed screw on the top passenger side of the radiator. This must be unscrewed while bleeding the system.

#9 danley


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Posted 15 February 2004 - 06:00 PM

well i finally got my 1990 legacy cooled down........installed new radiator (it looked like it had been hit with birdshot), backflushed again got some chunks of what looked like last owners block sealer, hoses, temp sensor, and thermostat. the thermostat made the difference. Its been about 28-30 up here @ 5600+ & she runs great. oh yeh when i got the new thermo i drilled a small hole in it per local subaru mechanic. this really helped to clear the air bubbles in block too.

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