Hello. i have a 92 buick lasabre that runs totally fine even on hot days until i turn on the ac. About an hour of running the ac, the engine will feel like its missing until it gets up to speed. I will have to turn off the ac to slowly remedy the problem. But if i shut off the car it will not start again until it cools off. btw I do not have any problems running the ac on cooler days less than 80 degrees or at night when the sun goes down. Thanks in advance.
It sounds like your AC compressor bearings may be overheating causing excessive drag/loading on the engine. No easy way to check this unless you can take the serpentine belt off when the car won't start and see if it is really hard to turn the compressor shaft.
SOURCE: 1994 Buick Regal Gran Sport shuts off once engine warms up.
it might be a bad ignition moduale. or could be a bad ignition coil
SOURCE: 1990 LeSabre Power loss with AC on. Within a Half
Remove battery cables and clean all three of the connections & replace bolts.
SOURCE: Engine cranks too long before
The issue may be related to the high temperature. You mentioned that the car runs hot at low speed. Inspect the radiator fan if it turns on when the temp gauge reaches the middle or close to it. The fan may not be starting up or is weak. If it does not turn on check first the relay. Try swapping it to test or it may be a bad fan. Check also if the fluid is adequate, check if the engine takes more fluid than usual. If the fan is OK and still you are loosing fluid then there may be leaks in the system or a bad water pump.
Other items that are affected by heat are the electrical components and wiring. Check for loose wires or loose connections. There may be bad wires, or ones that are worn out or exposed conductors that needs to be replaced.
Check the sparks for all cylinders. You can pullout the hi-tension cable from the engine and see if there is a spark while you hold it over the engine. Do this for each cylinder one at a time. You should be able to identify which one has no spark. For single cylinder it could be a bad hi-tension wire. For more than one issue it could be bad cables or the distributor coil is bad.
Check also the battery. IF you can jump start the car without any issues then the battery may be failing. Car battery other than being an electrical component has water inside which can be affected by the heat.
Try to do the tests to eliminate the possible causes and accurately narrow down you issues. If you can also have a scanner connected to the car it may retrieve error codes from the computer. Some shops would let you borrow their scanners.
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