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Discussion Starter #1
When it is below freezing out, my 4.3 will not warm up above 150f on the dash gauge. Heat blows warm/hot. No drivability issues. What should I check first? Replace thermostat?

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185 Posts
Discussion Starter #5
Interesting that I waz moved to HVAC. I have no issues with the heater. The temp guage is maxing out at 150f on cold days and takes forever to get there. This just started. it used to warm up to 200f even on the coldest days. I havent changed anything. On a warm day it will get to 200f and stay there. Could the thermostat be sticking open?
 
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