what causes a motor not to restart until it cools down after it heats up?

Asked by Jun 06, 2015 at 11:22 PM about the 1987 Ford F-150 STD Standard Cab SB

Question type: Maintenance & Repair

my truck will start with no problem, I can drive it as long as I want but when I shut it off and try to restart the motor it will do nothing ( no slow crank or nothing )  until the motor completely cools off and then it will start back up with no issues.  What is causing this?

2 Answers

95,265

It's called a thermal open, it happens to starters, alternators, electric motors when they start to show their age. Verify that you have good battery cables, both positive and negative, then check for full battery voltage to and through the starter relay when activated and at the starter itself, if voltage is not there replace the bad part, if voltage is there replace the starter. I have seem a few Fords do this when the ignition switch is starting to go but not very many, but I though I would mention it as it has has happened.

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340

just went through that with my s10 blazer ,, changed the starter and it was ok for awhile ,,ended up putting the heat shield back on that fell off between the starter and manifold .. its fine now ...

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