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#1
07-30-2022, 11:55 PM
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1970 esprit
My new local friend bought a 1970 number matching esprit and I'm trying to help him with engine heating issue. He says around town it runs fine temp around 185 190 then when he goes over 60 mph on freeway it starts climbing till about 240 he exits and it cools again. Can the group help him trouble shoot this. He has a new clutch fan engine rebuilt to 383 was a 350 he said. Im.thinking radiator possibly. He needs help.
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#2
07-31-2022, 03:34 AM
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Sounds like a clogged radiator.
JMHO |
| The Following 2 Users Say Thank You to Kenth For This Useful Post: | ||
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#3
07-31-2022, 10:10 AM
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Agree radiator capacity is generally the issue when overheating at speed. He should also check ignition timing at road speed RPM. Not just initial timing. Timing issues can cause overheating as well.
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#4
07-31-2022, 11:35 AM
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Fan clutch
__________________
 Current Pontiacs -1973 Formula SD455 - #'s auto orig paint 1972 Trans Am - 4 speed orig paint 1974 Formula 400 - Ram Air automatic 1966 2+2 convertible - 421 4bbl automatic 1967 Grand Prix - 4 speed orig paint 1967 GTO - 4 speed orig paint 35k orig miles |
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#5
07-31-2022, 12:26 PM
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Check the spacing of the water pump backing plate to the water pump impeller. That gap should be pretty damn tight. It's often overlooked and results in subpar cooling.
Make sure the radiator isnt clogged. New clutches for our fans can be hit or miss. Sometimes you get a dud that doesn't work like it's supposed to. Make sure it's engaging at temp. Double check timing. If the engine was run on an engine dyno, sometimes the timing an engine likes on a dyno isnt what it likes in a vehicle. Double check AFR. If it's lean, that'll heat up an engine at highway speeds pretty good.
__________________
"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
| The Following User Says Thank You to 72projectbird For This Useful Post: | ||
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#6
07-31-2022, 10:33 PM
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Which pulley is he running on the water pump (Big or small)?
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#7
07-31-2022, 10:42 PM
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I will add, in 1970, and especially in the desert south west, Pontiac Offered and sometimes installed at factory, a plastic air filler cover to be mounted on the top of the core support to the Bumper.
This ensured all the air from out front was forced into the radiator. ALSO.. Run a 160 degree Thermostat. and pressure wash the Condenser too if you take out the radiator.
__________________
"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#8
07-31-2022, 11:05 PM
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Not sure I'll get that info
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#9
07-31-2022, 11:06 PM
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Im taking screen shots of advise and sending it to him toll he becomes a member and introduced himself. I. Sure he appreciates all the help
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