When i first crank up when the engine is cold ,the fan runs very loud. after a couple of minutes it smooths out.temp. gauge stays about in the middle as long as you are moving but heats up when you stop at a redlight .lots of fluctuation in the gauge but never goes all the way to the red zone.
SOURCE: 2001 gmc jimmy engine warm but heater blows cold air
Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.
SOURCE: heater goes from hot to cold
I WAS TOLD IN THE PAST TO GET RID OF THE ORANGE ANTIFREEZE AND PUT IN THE GREEN IN ALL MY VEHICLES CREATES MORE PROBLEMS THE IT CURES THIS IS BY A SHOP I TRUST.I HAVE A 95/98 AND 99 BLAZERS.I HAD PROBLEM WITH VERY LITTLE HEAT AFTER CHANGING THERMOSTAT. HAD TO GET AIR OUT OF LINES BUY RUNNING IT FROM COLD START WITH RADIATOR CAP OFF UNTIL THERMOSTAT OPENED AND LEFT IT RUNNING UNTIL I SAW NO AIR BUBBLES COMING OUT OF RADIATOR SEEMED TO CURE PROBLEM
SOURCE: GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading
there are 2 coolant sensors one for gauge and one for ecm
SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm
you need to have the codes checked to know what direction to start repairs,Autozone does this for free
SOURCE: I have a 2001 Jimmy with "Service Engine Soon"
P0171 System too lean bank 1
P0174 System too lean bank 2
Last time you changed your fuel filter?
Look for any vacuum leaks.
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