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Need help - Legacy is Overheating
Posted 21 May 2004 - 07:56 PM
My 96 Legacy wagon has been overheating. No bubbles in the resevoir and the large hose on the passenger side of the radiator is hot when I check it. It doesn't seem to fit the symptoms of the dreaded head gasket problem. I am stumpted. Here's the story:
Tuesday we were commuting into work, after ~20 miles of pure highway driving the temp gauge started to climb and quickly reached the upper limits of the gauge. I pulled over and shut it down. There was a small amount of steam coming from under the hood. I left the key in so the fans would run to help cool the engine and then popped the hood. Anti freeze had sprayed inside the engine compartment on the driver side. I checked the resevoir, it was more or less full. No bubbles. Turned the vent cap a little and thought better of it when liquid hissed at me a bit. We let it cool and got got back on the road. While waiting (stopped) for a chance to turn around and head home the needle started climbing again. As soon as we got moving again it began to drop and probably hit the halfway mark within 200 yards of driving. Gauge remained just below halfway almost the whole way home.
We got of on an exit ramp, stopped at a stop sign for about 5 seconds, and were on our way. Needle began climbing. Within a mile it hit the bottom of the "H" I pulled over again. No steam, Fans turning, check resevoir - half full, no bubbles. Here's the odd part. I didn't feel a lot of heat under the hood. Placed my hand on the engine (manifold?) not hot at all??? Let the temp gauge hit halfway and head home again.
After about 2-3 miles were on "H" again. Pull over repeat steps. Resevoir is nearly empty. Engine still feels cool. Gauge drops we are moving again.
Repeat above steps after a half mile or so.
We are home. Resevoir is empty. Hose is hot. Engine is only warm. I crack the radiator vent cap, no spray. I remove it. I open the radiator cap with a towel. No spray. I add about 32 oz of water before coolant percolates out of the open vent.
Engine cools for abaout and hour and a half and it's of to the mechanic. 4 miles no overheating. He uses it as his daily driver the rest of the week, no overheating. He replaces the thermostat as a Hail Mary. I take it home tonight (Friday.) No problems on the way home.
2 hours later I am running to the store. Less than 2 miles and I'm overheating. Pull over, pop hood. Fans turning. Hose hot. Engine hot. No coolant spray. Resevoir is almost full.
I stop three more times before I make it home.
Any ideas? I am lost.
Posted 21 May 2004 - 08:16 PM
Posted 21 May 2004 - 08:28 PM
However I just got a sick feeling. Sometime after I replaced the cap, I got an oil change. They said my coolant tested "not safe" I had them change it out. Could coolant gases cause it to test "not safe" ?
I should add, I've got ~170,000 miles on it.
Posted 21 May 2004 - 09:49 PM
Posted 21 May 2004 - 09:57 PM
Posted 21 May 2004 - 10:43 PM
Posted 22 May 2004 - 12:28 AM
If so my bet would be HG.
Posted 22 May 2004 - 01:04 AM
I had a coolant change done by a Valvoline Instant Oil Change place. Did they burp it? They do them all the time, I would expect them to know how but I really don't know. Friday, when my regular mechanic (who has been super every time we used him.) changed out the thermostat, he explained to me how they hooked it up to a machine that removed all the air pockets. I assume this means he burped it.
Yes, 96 with the 2.5
Posted 22 May 2004 - 08:32 AM
to get it to blow bubbles, i had to take mine out on the highway for 20+ minutes, then pull over and check the expansion tank with the engine running. i would see a steady stream of small bubbles coming from the overflow tube...
Posted 22 May 2004 - 02:01 PM
Posted 22 May 2004 - 09:48 PM
Fins look ok.
Will have it checked for coolant gases asap.
Posted 23 May 2004 - 09:21 AM
Posted 23 May 2004 - 02:24 PM
Took it for a drive. Overheated about 15 miles from home
Followed some advanced burping instructions I found in another thread. Got alot of bubbles out. Ran it for awhile at ~2000 RPM with occasional revs to 3000. Noticed steam coming up. Looked for the source. Not the radiator. It's not steam, it's exhuast. It is coming from the Y joint right in front of the front catalyst! Could it be that a catalyst blockage is causing the overheating and exhust escape?
My mechanics sensor for check for gases is dead so I am going to find somewhere that can check for me Monday. I'm going to have them check my catalyst also.
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