Go look over at chevy truck forum and search, you will find the answer there.
SOURCE: fuel gauge bouncing on 2000 chevy tahoe where is fuel pump relay
fuel sending unit is in the tank. this is normal after about 75k miles and up. pump and sending unit are sold together. fuel sloshes from front to rear making the float on the sender rise and fall.
SOURCE: 99' Chevy Tahoe Air Conditioner not working
It doesn't blow cold air? Doesn't come on at all? What's the problem? If it doesn't blow cold after a charge, it leaks. Either on the compressor or in a line or both. To start at the dealer, a compressor is about $1200. That's what they told me. I have two leaks. You can buy remanufactured compressor on ebay for under $200. Or find a good shop (polar bear around here) with reasonable prices and have them do it for something in between.
If it no air is moved at all by your climate control system, the blower motor could be fried, the switch may have gone bad or a fuse is blown perhaps. If it moves air, but not cold air, recharge it and see if it stays cold. If so, great! If not, find the leak.
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