Spider
Junior Member
- Joined
- Nov 24, 2024
- Posts
- 7
- Reaction score
- 16
- Location
- Montana
- First Name
- Craig
- Truck Year
- 1990
- Truck Model
- gmc v2500 sub
- Engine Size
- 5.7 tbi
Alright, this is beating me up. Fresh rebuild, I have burped it, ran 3 different t stats, different temp t stats, verified the correct water pump, new fan clutch, and it still isn’t right. Without a t stat it sits at 120-130, Idling or driving. Ive been driving it as many as 50 miles at a time at highway speed and it doesn’t overheat sans t stat. I’ve shot it with a temp gun, the gauge works. And one of the t stats was actually cycling, but at 240 and then it would drop down like a good gm should. 240 is way too hot. I’ve driven tbi 350s throughout the years and usually they sit pretty consistent at 180 on the gauge. Radiator worked before I pulled the motor and it didn’t have overheating problems. Never seen a 350 act like this. It doesn’t take more than a couple minutes for it to get hot with the t stat installed. I’d run it for the summer without but I’ve got a couple more issues I’m working through and coolant temp needs to be at operating temperature to continue. Plus I like quick heat in montana spring time.
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