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95' Civic Overheating at High RPMs
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Young Blood
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Jun 14, 2009, 10:23 AM
Post #1 of 11
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95' Civic Overheating at High RPMs
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I have a 1995 Civic EX with a 1.6 lte Vtec motor that overheats at High speeds and RPMs normally 85 MPH it overheats and shuts off. After it shuts off I pop the hood and the over flow tank is hissing and the fluid in the overflow is bubbling or boiling. Also steam is spraying out the over flow underthe cap. Is this a thermostat issue? Thanks guys!
EDIT= There is no fluid leaking anywhere, Radiator looks brand new, the coolant in the overflow is just underneath the MAX line when boiling. after it cools down the coolant that was in the overflow is gone????Evaporate? sucked back into radiator? Its not leaking??
(This post was edited by Young Blood on Jun 14, 2009, 10:27 AM)
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Loren Champlain Sr
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Jun 14, 2009, 10:28 AM
Post #2 of 11
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Re: 95' Civic Overheating at High RPMs
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Young Blood; Sounds like a lack of coolant flow. Could be water pump, radiator, thermostat, ect. After overheating, probably better check for exhaust gasses in the cooling system, as well.
By the way, for the life of me, I can't think of anywhere in the U.S. that has a speed limit of 85mph. Hmmmmm.
Loren
SW Washington
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Young Blood
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Jun 14, 2009, 10:35 AM
Post #3 of 11
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Re: 95' Civic Overheating at High RPMs
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Also, after overheating it takes around a have gallon of fluid to bring the level back up. How do I check for exhaust gasses on coolant???
Maybe Im in Europe...
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Loren Champlain Sr
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Jun 14, 2009, 10:42 AM
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Re: 95' Civic Overheating at High RPMs
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>>Maybe Im in Europe... << Yep, entirely possible. In our part of the country, kids buy these rice burners and drive them like they think they are race cars. Can only do so much with a little four banger. And, they don't realize what happens to the engine when a timing belt breaks at 4000+ rpm. I just have to sit back and laugh.
Oh, back to your question....Exhaust gasses...Any shop that does emission repairs will have a gas analyzer. It will pick up any HC (hydrocarbons) in the cooling system. Very quick and easy test. You can also test with a chemical test kit which you can buy at most parts stores. If you are having to add that much water, I'd be concerned.
Loren
SW Washington
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Young Blood
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Jun 14, 2009, 10:57 AM
Post #5 of 11
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Re: 95' Civic Overheating at High RPMs
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My upper radiator hose is hot which tells me that coolant is flowing so I think I can eliminate the thermostat. I dont have any visible signs of leaking anywhere. I dunno, there is only a hand full of parts in the coolant system that can go wrong. Anyway your statement is extremely biased and irrelevant. I said nothing about treating it like a race car etc etc. in addition 85 mph is hardley a "race car" speed. I used 85 mph for diagnostic reasons so that I could present facts on here and try to get some FACTS back, and nothing else. If you acutally want to help me troubleshoot this I would be more than thankful but if all you want to do is display ignorant, biased ramblings then dont bother.
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Loren Champlain Sr
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Jun 14, 2009, 11:13 AM
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Re: 95' Civic Overheating at High RPMs
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>>Anyway your statement is extremely biased and irrelevant.<< Gosh, didn't mean to sound that way ...just my observations of folks in my part of the country. Long ways from Europe. Oh, and forgot to mention the tomato juice cans they stick on the tail pipe to make them sound like a....what's the word I'm looking for? LOL.
Yes, the upper radiator hose should be hot. It is very possible that the thermostat isn't opening all of the way. Sometimes, they'll stick partially open. You may get enough flow at lower engine speeds, but not enough at higher speeds. You can remove it for testing purposes, but the thermostat does need to be there. If you have a thermometer
(candy thermometers work great), you can put the thermostat in a pan of water and begin heating the water while watching the temperature and observe at what temp the thermostat is fully open. On the other hand, I'd just replace it while you've got it out. The thermostat keeps the engine at an even temperature. Engines nowadays must run at 180-210 degrees for emissions and fuel economy reasons. Some computer systems won't even begin to operate until the engine does reach temp.
Loren
SW Washington
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Young Blood
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Jun 14, 2009, 11:42 AM
Post #7 of 11
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Re: 95' Civic Overheating at High RPMs
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OK..UPDATE...I happen to have a thermostat on hand cause suspected it in the first place. I took the housing off and to my suprise there was NO THERMOSTAT in place, I assume the guy i bought it from took it out. So i put my new one in. The book says nothing about overheating cause of no thermostat, all it said was emissions and fuel economy will suffer. Could this had been the reason why I was overheating. if not i suspect I will have another problem soon, since the prior owner probably took it out for a reason.
I just discovered this ten minutes ago.
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Sidom
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Jun 14, 2009, 12:45 PM
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Re: 95' Civic Overheating at High RPMs
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My hats off to you Loren.... Kudos on taking the higher road....
You're a better man than me......
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Young Blood
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Jun 14, 2009, 12:53 PM
Post #9 of 11
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Re: 95' Civic Overheating at High RPMs
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blah blah blah. Got something to say then say it. I don't do passive aggressiveness.
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Loren Champlain Sr
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Jun 14, 2009, 1:19 PM
Post #10 of 11
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Re: 95' Civic Overheating at High RPMs
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Yes! The thermostat missing can actually cause overheating. The thermostat closes; While the water in the engine is getting hotter, the water in the radiator is being cooled. The thermostat opens, allows that cooler water to enter the engine, the hot water goes into the radiator to be cooled. Without the thermostat, the water continually circulates getting increasingly hotter and hotter, with no time to cool. Could easily be your problem! Good catch.
Loren
SW Washington
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Loren Champlain Sr
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Jun 14, 2009, 1:26 PM
Post #11 of 11
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Re: 95' Civic Overheating at High RPMs
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Sidom; LOL... No, I deserved that. I started it.
Loren
SW Washington
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