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temperture gauge shows hot
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ogden55
New User
Jun 20, 2008, 8:45 AM
Post #1 of 5
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temperture gauge shows hot
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I have gotten a new stat for my 96 subaru. For a few days it did ok but, then started to heat up again. So, I figure that the stat was bad and got another one. That wasn't the problem. My fear was the head gasket which I hope it isn't. I took out the stat and now it doesn't get hot but, this doesn't not solve the problem neither. Not sure whats next.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 20, 2008, 9:28 AM
Post #2 of 5
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Re: temperture gauge shows hot
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Any air in system will screw it up. That can be residual from just drain and fill and not purged out enough or a gasket (head) that is sealing cooling system from combustion gasses can bubble into cooling system and it won't straighten out on it's own.
Pressure tester would help. T-stat should be installed as that can cause overheating but in a back corner unseen and be trouble by itself. When you are pretty sure most all air is out upon refilling - bleeder, use a high hose - whatever it takes then if you allow engine to warm up with pressure cap off you should see flow or feel heat blowing off radiator by the fan. Now if you put the pressure tester on and it rises further it suggests gasses are the issue as it's already warmed up. Don't allow it to overpressure with a tester on it and try like heck not to overheat,
T
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ogden55
New User
Jun 20, 2008, 9:33 AM
Post #3 of 5
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Re: temperture gauge shows hot
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Thank You for the information I sure hope it isn't the heads. Don't have pressure tester to test like you suggest so is there any way it can be done?
(This post was edited by ogden55 on Jun 20, 2008, 9:36 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 20, 2008, 9:44 AM
Post #4 of 5
(2857 views)
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Re: temperture gauge shows hot
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Yes - testers can be rented I think - ask at parts stores. OR - if you trust the pressure cap you have they just feel a radiator hose (larger hoses tell better) for the pressure in the system. If it pressures up fast from cold as in too fast or can repressure up while already warmed up there's a problem. Duh - be careful with removing a cap while under pressure and touching hoses as they can be hot enough for a burn.
The rad or pressure cap whether on radiator or recovery tank allow just so much pressure then lets it off -- then it must hold vacuum also as when system cools and the coolant volume shrinks the idea is to push air to top or the recovery tank and only draw back liquid coolant from the bottom. That cycle eventually self purges air out of the system but some cars things are jammed in to fit the shape of the car so there are places for air to hide and sometimes will just not make it to purge out especially after an overheat that boiled or any time system is drained for service. It's a pill on some and I think this is one of them.
I don't want and neither do you find that the head gasket is the fault right now. It's worth the effort to really diagnose that as that's a big enough job to do and be wrong! It's not condemed yet. Keep trying but still don't let it overheat or it will be the issue.....
T
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ogden55
New User
Jun 20, 2008, 9:55 AM
Post #5 of 5
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Re: temperture gauge shows hot
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Thank you again..........I'll let you know how it did.
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