Replaced HG, still overheating???

Wileyk24 · 10-03-2012, 12:18 AM

FYI: Heater blows hot and no gurgling sound either...which I did have before I replaced the head gasket.

FRISBEE · 10-03-2012, 04:09 AM

may have a trapped air bubble, let it sit, cool off and top off the fluids. also check the fan clutch.

Wileyk24 · 10-04-2012, 12:18 AM

Fan clutch is replaced, brand new unit. I will try to top it off and see if it bubbles at all. I am at a total loss here. Going to test my thermostat as well(which is new also).

Mishimoto · 10-04-2012, 02:21 PM

Hmm See what happens after removing air from the cooling system. Perhaps a wonky temperature sender is causing this?

Bill UK · 10-04-2012, 06:56 PM

Any increase in the level of the coolant expansion tank level when this happens ?

Wileyk24 · 10-06-2012, 02:47 PM

Bill I will check. I am working on the car this weekend, I remember how much was in there before it overheated, so I will see if there was any overflow.

What are you thinking?

Wileyk24 · 10-07-2012, 08:00 PM

Ok so no change in the radiator fluid level. The overflow bottle dipped slightly, less than an inch. The car is not overflowing coolant onto the ground either.

So today I decided to test the thermostat. I took it out, checked the bottom an it is a 195 degree tstat. I proceeded to boil it and with a thermometer found it wasn't opening until well after 200 degrees. Brand new unit, not functioning properly. So I went to autozone to get a new one and the system said I needed a 180 degree stat. So I bought it and took it home and boiled it. The new one open as it should and seemed to open easier than the last. Time to install.

I installed the new tstat, topped off all fluids and took her for a test drive. Good news, I made it a lot further than just one block. I actually drove all around town and on the highway. The car felt good, but my temperature gauge is settling at 3/4 the way up the temp gauge and staying there. Regardless of how I am driving.

So when the car is idling the temp gauge stays right in the middle. Once I start driving city or highway it goes up to 3/4 and stays there. Once it is up there it won't come down until I shut off the car, even at stop signs it stays up there. But once the car is off, I turn the key back on so the gauges are powered and the temp gauge sits at slightly under halfway which is perfect...

Anybody experience this before?

10-03-2012, 04:09 AM	#2
FRISBEE Intake Join Date: May 2010 Location: Albuquerque, New Mexico Posts: 49	may have a trapped air bubble, let it sit, cool off and top off the fluids. also check the fan clutch. __________________ 1991 Toyota Supra 580rwhp617TQ 11.80@117MPH Under Construction 1992 Honda Prelude 400Hp ??TQ 14.0@ 114MPH Time for Update 2007 Cadilliac Escalade daily Knowledge Is Power...................

10-04-2012, 02:21 PM	#4
Mishimoto Stock Join Date: Jun 2012 Location: Wilmington, DE Posts: 5	Hmm See what happens after removing air from the cooling system. Perhaps a wonky temperature sender is causing this? __________________ John Marsteller Mishimoto Automotive

10-07-2012, 08:00 PM	#7
Wileyk24 Stock Join Date: Dec 2011 Location: Middletown, NY Posts: 27	Ok so no change in the radiator fluid level. The overflow bottle dipped slightly, less than an inch. The car is not overflowing coolant onto the ground either. So today I decided to test the thermostat. I took it out, checked the bottom an it is a 195 degree tstat. I proceeded to boil it and with a thermometer found it wasn't opening until well after 200 degrees. Brand new unit, not functioning properly. So I went to autozone to get a new one and the system said I needed a 180 degree stat. So I bought it and took it home and boiled it. The new one open as it should and seemed to open easier than the last. Time to install. I installed the new tstat, topped off all fluids and took her for a test drive. Good news, I made it a lot further than just one block. I actually drove all around town and on the highway. The car felt good, but my temperature gauge is settling at 3/4 the way up the temp gauge and staying there. Regardless of how I am driving. So when the car is idling the temp gauge stays right in the middle. Once I start driving city or highway it goes up to 3/4 and stays there. Once it is up there it won't come down until I shut off the car, even at stop signs it stays up there. But once the car is off, I turn the key back on so the gauges are powered and the temp gauge sits at slightly under halfway which is perfect... Anybody experience this before? Last edited by Wileyk24; 10-07-2012 at 08:04 PM.

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10-03-2012, 12:18 AM	#1
Wileyk24 Stock Join Date: Dec 2011 Location: Middletown, NY Posts: 27	FYI: Heater blows hot and no gurgling sound either...which I did have before I replaced the head gasket.

10-04-2012, 12:18 AM	#3
Wileyk24 Stock Join Date: Dec 2011 Location: Middletown, NY Posts: 27	Fan clutch is replaced, brand new unit. I will try to top it off and see if it bubbles at all. I am at a total loss here. Going to test my thermostat as well(which is new also).

10-04-2012, 06:56 PM	#5
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Any increase in the level of the coolant expansion tank level when this happens ?

10-06-2012, 02:47 PM	#6
Wileyk24 Stock Join Date: Dec 2011 Location: Middletown, NY Posts: 27	Bill I will check. I am working on the car this weekend, I remember how much was in there before it overheated, so I will see if there was any overflow. What are you thinking?