My '95 Roadmaster shows operating temperature just two marks from the minimum reading. So, when the temps are low outside, the heater doesn't work very well. I think the guy who replaced the water pump put a 160 degree stat in.

I've researched and found that OEM was 180. Would I be better off with a 195 degree stat? All new cars use them vs. the 180 for better mileage.

 

Looks like this forum is a dead duck!!

 

I put the 195 stat in with little help for the heater. I flushed the heater core with a garden hose by removing the hoses and running water backwards through it. A lot of crap came out--now the heater works great! Easy 10 minute job!