runs to cold?? 12/27 My 88 K5 doesn't ever seem to warm up. I don't get much heat from the vents. I have a new water pump, radiater,and a new 195 stat. It still has the clutch fan, but thats not locked up. at an idle the rad fluid temp only gets to 120. This is my plow truck. Any idea's why?? This is my plow truck, some heat would be nice!! I'm gonna try some cardboard over the front, But I shouldn't be having this problem!! I have never had one run this cold! 12/22 Put another new t stat in today. The engine temp guage came up to 190-210 range on the factory guage, and the temp at the top of the radiater was going between 110 and 135. But still no heat. I'm starting to think I have more than one problem here. I was checking the hoses, The hose that goes into the heater core is hot, but coming out it's warm. I had to quit working on it before I could go further, But it seems that the heater core may be restricted or plugged. I am gonna pull the hose off the outlet side and see what comes out. I may end up changing that out next.