The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - vintage air and overheating issue (LS engine)

LS short box · 04-01-2024, 04:38 PM

So what are you running for engine thermostat? Stock? On my stock 20 Silverado with a 6.2 per the temp gauge it runs day in day out at 210 ish. But as soon as I turn on the AC the fans come on and stay on until the AC is off. On my 6.2 LS swapped 80 Camaro I used a 180 degree thermostat. Drilled some 1/8" holes in the flange to get some coolant flow even on startup. Fan set to go on at 205 and off at 195 via the ECM.
The other thing to consider as you are moving the heater hoses on and off you may have created a air block on/in the steam tube.

04-01-2024, 04:38 PM	#8
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,943	Re: vintage air and overheating issue (LS engine) So what are you running for engine thermostat? Stock? On my stock 20 Silverado with a 6.2 per the temp gauge it runs day in day out at 210 ish. But as soon as I turn on the AC the fans come on and stay on until the AC is off. On my 6.2 LS swapped 80 Camaro I used a 180 degree thermostat. Drilled some 1/8" holes in the flange to get some coolant flow even on startup. Fan set to go on at 205 and off at 195 via the ECM. The other thing to consider as you are moving the heater hoses on and off you may have created a air block on/in the steam tube.