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When you installed the dual stat mod did you also install a Bypass Restrictor Fitting ( BRF) onto the water pump crossover to help balance the coolant flows?I know this has been an issue with the 6.5 and has been discussed for years.
I have a 1995 C2500 Suburban. New heads were installed about 30,000 mile ago. Had a blown head gasket on the forward right hand cylinder.
Installed new heads and at the same time upgraded the water pump to a HP, new Hummer 10 blade fan and Hayden severe duty clutch and changed from single T-Stat to dual.
I'm the original owner, bought it new. Never really had heating issues until I did these up dates.
So if i'm sitting for a even a short period of time the temp starts to climb and of course going up an incline, same thing. When driving temps stays around 190 or so, as best as I can tell from the factory gauge.
The stack is clean and I even within the last couple of years installed a new Radiator, and not one from the local Auto parts places, a high quality radiator.
I don't drive this Suburban much anymore, Maybe 3,000 miles a year to go from the Dallas area to southern Colorado. Going through New Mexico in the summer can be a little bit of a challenge to keep the temp down, especially with climbing a grade or idling.
Last year I installed another new Hayden clutch, however that didn't help.
Any thoughts or advice?