Check the pressure in the Freon lines. There are low and high limit switches that can interrupt the system and it appears to be related to pressure. The pump may not be working at optimum performance. It will take a manifold pressure gauge set to check this.
SOURCE: my 1995 chevy 6.5 L diesel dies at highway speeds. Why?
I could bet 99.9% with out seeing the truck my self that your probelem is the PMD I have two of these trucks and know many people that also have them and the vast majority of problems with the Chevy 6.5L diesels are from the PMD. A must when replacing the PMD is moving it from its place on the injection pump on the top of the engine to a place that dosent get so hot. A good place is the front bumper or skidplace, search for Heath Diesel they have a kit to move it. Its worth every penny.
Justin
SOURCE: Fuel Gauge
I believe chevrolet has a recall on this problem having to do with wiring repair at the tank.
SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado
you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .
SOURCE: 2000 CHEVY SILVERADO 5.3L FUEL GAUGE PROB.
The problem is in the tank.The sending unit float gauge is worn.Its a factory GM issue.You will Need to replace the sending unit in the tank.I had the same problem and thats what I found.Its real common and this will solve your problem..Its 67.00 Dollars on Ebay..
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
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