Overheating

1970 CHEVROLET CAPRICE
200 MILES • 0.5L • V8 • 2WD • AUTOMATIC
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CATCHUP777
  • MEMBER
  • 6 POSTS
I have the car listed above with a rebuilt 350. i put the car up for the winter. When i put the car up for the winter no problem. I pulled it back out when the weather broke. It started overheating. i put new water pump, thermostat, and flushed the radiator still overheating. No white smoke, no antifreeze mixing with oil.
Mar 19, 2022 at 9:41 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

Is the fan in good condition and not slipping? Are you certain the engine is overheating or are you going off a gauge or light? Have you adjusted the ignition timing since you got it out for the summer? Don't laugh, but is the heater working?

Let me know.

Take care,

Joe
Mar 20, 2022 at 1:24 PM
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CATCHUP777
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  • 6 POSTS
Since it was overheating i bypassed the heater core.
Mar 21, 2022 at 10:55 PM
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CATCHUP777
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  • 6 POSTS
I change all the hoses remember it wasn't running hot before I put it up.
Mar 21, 2022 at 10:56 PM
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CATCHUP777
  • MEMBER
  • 6 POSTS
So the ignition timing have something to do with overheating correct?
Mar 22, 2022 at 12:51 AM
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CATCHUP777
  • MEMBER
  • 6 POSTS
It also takes about ten minutes to overheat it doesn't do it right away.
Mar 22, 2022 at 12:59 AM
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CATCHUP777
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  • 6 POSTS
The engine overheat it comes out the overflow.
Mar 22, 2022 at 1:00 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

If the ignition timing is too far advanced, it can cause the engine to run hotter. However, if you haven't touched it, that shouldn't be the issue.

If you open the radiator cap when it's cold and start it, does the coolant start to flow when the thermostat opens? Also, and don't laugh, pay attention to the lower radiator hose when it starts to overheat (when the radiator cap is installed). Make sure it isn't collapsing.

Let me know.

Joe
Mar 22, 2022 at 11:33 AM
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