Running too cold

[JeepSJ]

Now that the hot weather is gone, the Waggy is running at about 180*(verified on both the stock and aftermarket gauges). I have 195 tstats in it. I do notice that the upper rad hose starts to warm up within a few minutes of startup. On one of my road trips when I was coming down a long grade, the temp got as low as 160. I would really like to see the temps up around 195 all the time. On the 110* days it ran at 190-195.

Do the factory tstats (on a dual tstat setup) allow a small amount of coolant to bypass all the time, or do I just have a bad tstat?

Thanks!

Mark

[Kenneth]

Last winter I was in rexburg, ID. My 94 (single stat) was alsways running at 160-170 when warm. After having the stat intermittenly working and blowing a radiator hose I replaced the thermostat and immediately my water temp was constantly at 190. Even in the cold weather i could watch the stat open and close on the temp guage. My temp would warm up and then the stat would open and the temp would drop. I would guess at a or maybe both bad stats.

[DA BIG ONE]

Going down hill will cause cooling because air is rushing through radiator and engine is a very low rpms = lower flow at water pump resulting in guick cool down.

[HammerWerf]

I haven'l looked that closely at the 330-Stat (dual Tstats), but I know that on the 370's (Old single stat) there is a small opening to allow gas and fluid to pass by.

Coasting down hill put the engine in a minimum fuel condition. With the DS4, it actually shuts off the flow. I've watched the temp guage go back down toward 160*F on summer days on long enough hills. DB2's sort go to idle.

HammerWerf

[Warren96]

In the summer months I use the dual spring stats which provides max cooling. But since I do NO towing the single spring stats go in in the fall. That gives me the factory stat when I need it most in the summer. No matter how many dual spring stats I buy, I cant find one that will open at 195, always lower like 150 to 170. When the dual spring jobs go bad they have been known to leak warm coolant.

[JeepSJ]

Well, part of the mystery solved. The stats were from Mr Gasket, so I contacted their tech support. They said they had a bad batch of stats and suggested that I replace them. I'll be installing my heater soon so I'll be draining the system - seems to be a good time to change them.