View Full Version : which thermostat to get

02-16-09, 01:03 PM
I think i am in need of a new thermostat, because the heat is not very good anymore - it just blows out cold to luke warm air. So my question is which type of thermostat should i get. I see there are a couple of options as far as different operating temperature's. like 160, 180, and 195. And also should I get a fail safe or non fail safe? I have the 305 engine. Thank you for any info!

02-16-09, 01:55 PM
160 is far too cold for any modern engine with temperature-sensing emissions controls and it never allows the engine and oil to warm to efficient operating temperatures.

See if you can find the recommended temperature in your owner's manual or in a cross-reference book in a local Auto Zone, Pep Boys, etc.

Either 180 or 195 would be OK, but if you live in the South or Southwest, lean toward 180.

My STS thermostat starts to open at 188 and is fully open at 206, so that's an indication of where modern engines are set to run.

02-16-09, 01:59 PM
According to AutoZone.com the 195 is original equipment. If it were my car, I would go to Advance Auto and get the AC Delco thermostat because AC Delco is original equipment for GM vehicles.

02-16-09, 02:34 PM
Use the stock 195. Better gas mileage, better heat, better transmission operation (the trans fluid temp is controlled by the temp of the engine coolant by the cooler in the rad tank).

02-16-09, 03:33 PM
thanks guys! I'm gonna go with the 195

02-16-09, 09:23 PM
I ended up getting a Stant 195. installed it with an purdy blue Felpro gasket and burped the cooling system. That was def. the problem, The heat works great now! I'm so happy now. Thanks guys!