case310350

I think I need to replace the thermostat, but was wondering under no tow outside temp 60 degree what would the coolant temp be? Mine stays below 140 which means the anti wear additives are not being activated. So Before I start to work on it want to make sure normal temp is about 190?? real world

97 4x4 3500

BigErksG2

mine is usually around 160 on a cool day no towing, 180 when its 85 outside.

JohnX

180-190 all the time, but it does take about ten minutes of driving to get it there. If your truck won't reach operating temps, your thermostat might be stuck open or missing all together.

It is very important that it runs the right temp, too cold can allow condensation build up in the motor and cause problems.

Hammily

Time for a new thermostat.

patdaly

Yep, new thermostat time.

Greenie had that problem when I bought her, turned out a piece of gasket had gotten stuck and was holding the poppet open slightly.

These things have such an overkill cooling system, it doesn't take much to let them run too cool.

Anders

I'm glad you posted this question because mine stays below 140 as well. I never thought much of it but I might look into the thermostat.

BigDave12768

My old 94's temapture Guage would go up and down over and over. 185 back down to 160 then up again