Definitely get the codes read if any. But usually the check gauges light is telling you to monitor the gauges due to a pressure problem. If the oil pressure gauge is high it could mean there is a blockage in the flow from the oil pump to the heads if there is a blockage it will cause the vehicle to over heat (at the least!) It will also destroy the engine! Have a mechanic run a pressure test on the compression, oil pump, and oil flow to the heads.
SOURCE: fuel gauge stuck on half full
I can tell you almost for certain your fuel level sending unit is bad, I have been able to fix them though. It requires removing the gas tank and then the fuel pump. You can if your inclined, bend the brushes on the small circuit board over more so they will make better contact on to it. Other wise its a new fuel pump assembly, check all plugs and wiring by unpluging and repluging them to insure no bad connect. It is possible it could be the guage itself, but in thirty years of fixing cars never had a bad guage
SOURCE: 2005 GMC Sierra Overheating
If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.
SOURCE: gmc Envoy with erratic fuel gauge.
I have found that just about 100% of the time this condition is caused by a defective fuel gauge sending unit in the gas tank.
SOURCE: gas gauges and temp gauge stopped working on my 99 jimmy any idea
check fuse box,under your dashboard or hood.look for small print,that indicates the fuse operations
SOURCE: AC only warm air is coming through the vents
there is a clutch under the pully you see turning that allows the belt to turn without running the compressor.you may want to check the optimum pressure rating for yuor truck.it sounds to low to me.check that with your local auto parts dealer.hope this helped
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