Based upon a similar and recent experience with my '90 760GLT, I'm bettin' on a bad starter. I, too, noticed a strong correlation between temperature and unsuccessful starter operation. If surface temperature of the starter rose above 110 deg. F, the starter would not work. This high temperature could result from driving the car or letting it sit out in the sun. Then, when I poured or sprayed water on the starter motor, lowering the temperature to the 90's, the starter would function. I proved to myself that the ignition circuit was not at fault. In this test, I disconnected the thin wire from the T50 starter terminal. Then I measured voltage at that wire as I rotated the ignition switch. I always got 12+ volts when the starter motor would not function. The solenoid was getting the required voltage. Battery, grounds, cables were eliminated earlier as possible sources.
I used a non-contact infrared thermometer purchased from Harbor Freight. Starter was still under warranty. I had to go to these lengths to prove to the mechanics as they would turn me back to tell me the starter was not my problem.
For the love of Volvos.
Mike
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'92 245DL, '90 760 GLT
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