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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Diesel Engine Discussion => Topic started by: K20Detroit on January 05, 2016, 07:58:17 pm

Title: 6.2 thermostat - is AC Delco 132-55 still the best?
Post by: K20Detroit on January 05, 2016, 07:58:17 pm

I believe my T-stat is stuck open.
At 40-50F, it takes a good 2-3 minute idle + 15 minutes of driving to get to a 120+F reading on the gauge. It never goes above 150F.
Anything below 32F, it never goes above 110F. If I idle, the gauge drops fast.
I have blocked the center of my rad for the time being. Rad is full, overflow is at the right level.

4+ years ago, all the forums said the 132-55 was the way to go. It seems that recently, manufacturing went overseas and quality has gone down. Is this still the way to go? It's the only 190/195 stat out there.

Title: Re: 6.2 thermostat - is AC Delco 132-55 still the best?
Post by: Captain Swampy on January 05, 2016, 08:09:26 pm

Rock Auto has Gates, Motorad, Stant, AC delco

Title: Re: 6.2 thermostat - is AC Delco 132-55 still the best?
Post by: K20Detroit on January 06, 2016, 03:30:20 am

None of the Motorads are proper temp, + most Motorad thermostats have been known to fail open when new.
The Gates 33924 and Stant 14429, are the same parts. a few reviews from Jeep owners, not much else.
The majority of aftermarkets are not 195F thermostats, just those two and the AC Delco 132-55. However, everyone debates what one is dependable.
I'm mainly trying to figure out if the 132-55 is still the one to get, or if it's now unreliable? The 14429 seems nice from what i'm reading on it.