Join Date: Jun 2009
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How To: Replace 4.3 Thermostat
If you notice your 4.3 seems to take a while to warm up, you may have a sticking thermostat. There are many reasons why you may need to replace your thermostat. Here, we will focus on the remove/install procedure.
First, lift the hood. Make sure your motor is cooled.
Remove the air intake and coolant overflow cap.
Remove the bracket holding the throttle cables and the ac wiring using a 10mm deepwell socket.
Pull the hose out of the bracket that goes from the water pump to the heater core and twist and pull up on the retaining bracket for the hose, it will pop right off.
Using a 13mm deepwell socket, remove the 2 stud bolts holding the thermostat housing to the intake.
Pull easily up on the thermostat housing, easily pull it aside.
Using a needle nose plier, for it may still be warm, remove the thermostat.
Now, clean the seat where you will install your new thermostat. You can use a q-tip, if its not got build up.
Install your new thermostat in its new gasket.
Now, insert the stat into the seat in the intake.
Replace the housing onto the intake over the new thermostat.
Tighten the bolts to torque specs, using a 13mm deepwell socket.
Re-install the bracket for the hose that feeds the heater core from the water pump, by pushing it on and spinning.
Re-install the bracket that holds the throttle cables and a/c wiring, with a 10mm deepwell socket.
Re-install the air intake to the throttle body.
Re-install the overflow cap.
Start the engine, allow to warm up. If no leaks, you're done.
If you have leaks, find the location and re-inspect the torque tightness, gasket(replace if needed).
1999 CHEVY S-10 4.3 LITRE CSEFI VIN X AUTO TRANSMISSION. BOUGHT BRAND NEW. LOVE EVERY MINUTE OF IT.
Last edited by What?; 12-24-2010 at 04:02 PM.