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65 L79

brumbach

Well-known member
Joined
Mar 6, 2004
Messages
330
Location
Middleboro, KY
Corvette
1965 convertible
What is the correct operating temperature for the L79? Mine runs a little cool, around 140 degrees. Shouldn't it be closer to 180?
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
Yup, should run at about 180* with a 180* thermostat. Shoot the upper radiator hose just above the thermostat housing with an I.R. gun and compare that against the gauge reading so you know what the gauge is really telling you - the gauges are notoriously inaccurate, especially if the original sending unit has been replaced.

A correctly-functioning thermostat won't allow the engine to operate much below the thermostat's rating; that's what they do - they determine the MINIMUM operating temperature.

:beer
 

Rowdy1

Well-known member
Joined
Mar 26, 2001
Messages
1,180
Location
Lake Hopatcong, NJ
Corvette
1962 CORVETTE-SOLD 2004 Z16 Z06 CE
John............

Is there any one particular replacement sending unit that is the closest to original?

Thanks
 

brumbach

Well-known member
Joined
Mar 6, 2004
Messages
330
Location
Middleboro, KY
Corvette
1965 convertible
Yup, should run at about 180* with a 180* thermostat. Shoot the upper radiator hose just above the thermostat housing with an I.R. gun and compare that against the gauge reading so you know what the gauge is really telling you - the gauges are notoriously inaccurate, especially if the original sending unit has been replaced.

A correctly-functioning thermostat won't allow the engine to operate much below the thermostat's rating; that's what they do - they determine the MINIMUM operating temperature.


:beer
I hadn't received your response before I purchased a stat from advance auto. The one I bought is 195 degree. They said it was correct for the car but I trust your opinion more, obviously. Anyway, I installed it and could tell an immediate difference. Outside temp is 43. The car went into fast idle as it's suppose to and the temp gauge began climbing shortly there after. The gauge rose to just over 180. Pumped the accelerator, idle dropped to 750 and went for a quick run. When driving, cruising at about 45 mph, temp gauge dropped to 140. After returning home let the car idle for about five minutes and the gauge rose to just under 160. As you said the sending unit or gauge may not be correct so I'll look into an IR gun to make sure everything is good. It's definitely running warmer and for winter ops, that's what I want. Thanks --
 

Vetsvette2002

Well-known member
Joined
Nov 20, 2002
Messages
198
Location
Willowbrook, IL
Corvette
67 convt. L79 Marina Blue
Yup, should run at about 180* with a 180* thermostat. Shoot the upper radiator hose just above the thermostat housing with an I.R. gun and compare that against the gauge reading so you know what the gauge is really telling you - the gauges are notoriously inaccurate, especially if the original sending unit has been replaced.

A correctly-functioning thermostat won't allow the engine to operate much below the thermostat's rating; that's what they do - they determine the MINIMUM operating temperature.

:beer

John,
Should the IR gun be pointed at the hose or at the T-Stat housing metal?
Don
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
Is there any one particular replacement sending unit that is the closest to original?

Thanks

Some folks have reported good results with the Wells TU-5 (AutoZone) or the Standard ST-6 senders, some have not; it's a crapshoot. That's why an I.R. gun shot is a good idea, so regardless what sender you have, you'll know what the gauge is really telling you from then on.
 

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