Overheating

Tiny
CATCHUP777
  • MEMBER
  • 1970 CHEVROLET CAPRICE
  • 0.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 200 MILES
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.
Sunday, March 20th, 2022 AT 4:41 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 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
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Sunday, March 20th, 2022 AT 8:24 PM
Tiny
CATCHUP777
  • MEMBER
  • 6 POSTS
Since it was overheating I bypassed the heater core.
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Tuesday, March 22nd, 2022 AT 5:55 AM
Tiny
CATCHUP777
  • MEMBER
  • 6 POSTS
I change all the hoses remember it wasn't running hot before I put it up.
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Tuesday, March 22nd, 2022 AT 5:56 AM
Tiny
CATCHUP777
  • MEMBER
  • 6 POSTS
So the ignition timing have something to do with overheating correct?
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Tuesday, March 22nd, 2022 AT 7:51 AM
Tiny
CATCHUP777
  • MEMBER
  • 6 POSTS
It also takes about ten minutes to overheat it doesn't do it right away.
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Tuesday, March 22nd, 2022 AT 7:59 AM
Tiny
CATCHUP777
  • MEMBER
  • 6 POSTS
The engine overheat it comes out the overflow.
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Tuesday, March 22nd, 2022 AT 8:00 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 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
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Tuesday, March 22nd, 2022 AT 6:33 PM

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