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After going on a drive last nite with warm weather and some heavy traffic my car overheated on the way back and preety much just made it home , got in the driveway and turned it off . This morning I filled it close to 8 litres ( 186 ) and it started up first go but went around the block and she got hot real qiuck and I drove back into the driveway turned it off it was overflowing through the cap and overflow tube . No white stuff on dipstck , oil cap , and in the radiator . Could it still be a blown head gasket ? Blocked radiator ? Thermostat ? Had no probs in the past and went to lake eildon only a few days ago good as gold .
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If it's getting that hot that quickly, but it did start & run smoothly when cold, I would suspect a jambed thermostat.
Dr Terry.
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Started first go ran smoothly with no loss of power like I experienced last nite . But lost at least 5 litres whilst running and with most of it coming out through the cap soon as I turned the motor off . Will be picking up the radiator on Tuseday as i will be getting it cleaned out as it may be blocked and a new t/stat will be going in also .
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If it suddenly got hot and is pumping the water out the overflow you would think there is a strong chance it has blown the head gasket. The water does not always go into the sump. Some motors blow the fire ring and just let combustion gas into the water. Had it happen on a 9G with a perkins and an old 77 hilux we have.
If the thermostat is jamed and you drove it till it got a loss of power i would say head gasket for sure and i would do a full cooling system flush and check.
Sometimes if you fill the rad and run the motor without the cap you can see bubbles coming up through the water at the neck in the rad.
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I also recently had the end off the sender on the temp gauage brake off and lodge in the thermostat of a cummins and the result was intermitant over heating as the piece floated in and out of the thermostat.
It all depends how hot it got as to how much damage it does.
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hopefully its not the head gasket and once I get the radiator back with the new t/stat and cap and a good clean out of the motor the prob is solved , fingers crossed . If I had run it without the t/stat b4 sending the rad out would that have crossed out the gasket as the prob ?
Cheers
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Yeah it probably would rule out the head gasket as the problem if it stopped getting hot. However you said it had some power loss? You may find some other problems crop up in the future like continued water loss and over heating.
What engine are we talking about?
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pull the thermostat out and put in a cup of boiling water and you will soon see if it is working.
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Its a 186 , and the power loss was experienced only when it overheated . Once refilled ran it again this morning and power was good and didnt drive it long enough to get it too high a temp but it still went out the overflow tube and out the tightly closed cap .
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Leave the radiator cap off for a while and see if the water continues to come out the overflow or the cap or not. If the head is cracked pressure will build up in the cooling system because of pressure leak from combustion chamber into to the water jacket. If you leave the radiator cap of there can be no build up of pressure. Temperature does some funny things. If there is a cracked head that is not evident when on 1st start up in the morning or when cold and power loss comes only with motor heating up could indicate expansion and contraction is opening and closing a crack. Cold the crack is closed no leak, motor warms up crack opens up and compression leaks into the water jacket. Another thing that can be a bit of a hint is bubbles showing with the radiator cap off. If no bubbles when cold, only when hot or as the motor gets hotter then pressure is leaking through a crack that is opening as it gets hotter.....So having said all that just leave the cap off for a few days and see if still getting hot or not and if any bubbles. Just keep topped up with water though A blown head gasket on the other hand will allow pressure from the water jacket to leak into the cylinder or oiling system and will show white or water in the oil. .....Jack
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Hi,take you thermostat out and start the car ,then spit in the radiator to check water pump flow.if it flows ,good if it doesn't ,then there is a blockage somewhere..P.S. I choose to NOT run thermostats in my cars for this reason,but everyone whines about it,I have had NO trouble. Conversely you can drill holes in your thermostat if you have to fit one(that works!). sound like a gasket to me thou! Jim in Adelaide.. Edited by user Sunday, 9 January 2011 10:52:07 PM(UTC)
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Jim in Adelaide.. |
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thanks for all the feedback fellas . I took out the t/stat not long ago and put it into boling water and the result was good as it didnt move at all . I also checked all the plugs as a mate told me that if the gasket was gone then u may see some green from the coolant on the plugs and all i could see was oil . So it should fix the prob as the t/stat wouldnt let any cool water in and the radiator just got too hot and forced the water out .I will get the radiator back tuesday and put it back in as it will be clean and ready to go and I will let u all now how it went .
cheers .
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the thermostat should open in boiling water...no exceptions.
Jim in Adelaide.. |
Jim in Adelaide.. |
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Second Jim on that motion. That thermostat is for the rubbish bin. Looks like Dr Terry had it first go! Edited by user Monday, 10 January 2011 7:08:18 AM(UTC)
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