SOURCE: temp gauge off charts
Both my temp and tach have gotten stuck like all of yours. When either does not zero out after you turn the engine off there is one thing that seem to work every time: 1) put key in ignition, 2) turn the key until you start to feel resistance and then turn it back (turn the key so that the battery is on and stop just before the engine is about to turn over.)
The temp and/or tach will slowly fall a little closer to zeroing out each time you do this.
Generally I have to repeat this half turning of the key a up to a few dozen times before the temp or tach will zero out. From what I have read this is a result of poor wiring that is common with cavaliers of the early 2000s.
SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full
Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.
SOURCE: ignition timing specs for a 1986 Chevy 454?
Automatic I presume. 8 degrees BTDC @ warm & 700 RPM.
distributor vacuum off & plugged. In drive, & accessories off.
Don't forget parking brake on.
SOURCE: 1995 GMC suburban temp guage pegs high, but heater
Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.
Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!
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