Low water temp

[APEX 06]

I seem to be getting low water temps. Highway 192-194 rolling to a stop sign it drops to 186-188. Outside Temps have been around 40°.

[RIDETHE]

Doesn't seem that bad. Too hot would be a bigger concern.

[Doss]

That really doesn't seem to alarming. I was thinking you were going to say below 170.

How long has the truck been running when you see these temps (again, they don't look like they are a cause for concern)? The heater could knock temps down a few degrees as well if you're running it.

Worst case it could be your thermostats or the water to coolant balance may be off some.

[superduty6.4]

Originally Posted by APEX 06

I seem to be getting low water temps. Highway 192-194 rolling to a stop sign it drops to 186-188. Outside Temps have been around 40°.

Mine does the same thing dropping a few degrees when rolling to a stop sign, especially if my heater is on.

[APEX 06]

Originally Posted by Doss

That really doesn't seem to alarming. I was thinking you were going to say below 170.

How long has the truck been running when you see these temps (again, they don't look like they are a cause for concern)? The heater could knock temps down a few degrees as well if you're running it.

Worst case it could be your thermostats or the water to coolant balance may be off some.

Just last night 160 miles and any time I let off the temo drops. Where are the thermoststs easy to check. Thanks for the help guys.

Sent from the can!

[Tidalwaters]

About an hour to change Thermostats out if EGR coolers are not in place. The upper Radiator hose connects to the thermostat housing. I had to change mine out about two weeks ago the kit from Ford ran about 40 bucks if not mistaken. The rubber on both stats were in bad shape. Truck would not reach operating temp as quickly as it should also throwing a code. Good luck.

[04hdfatboy]

Mine does the same thing. Temps here havent gotten much over 30* these last couple of weeks.

[nlcougar]

That should be normal. I drop from 194 to about 190 when coasting to a stop. This is after an hour or so of highway cruising. Its especially noticeable when the weather is cold. about 40 degrees or so.

[Big Angry Hillbilly]

Putting the winter front grille cover on will help this, not a LOT, but it will help. I lose anywhere from 2-4 degrees on the ECT when I'm waiting at a stoplight.

[psdstrkD95]

I dont now to much on the technical specifics of a 6.4 and thermostat failures. But in alaska we see temps all over the scael and my 7.3 behaves liek that to, drops like that happen fast once those pistons stop producing heat energy to be absorbed by the coolant. Plus the 6.4 is a "hot" engine just liek all modern diesel trucks engines so when its cold out there still cooling like they have to at 120 degrees with belt driven fans so i think it could just happen. If its below 10 degrees my truck doesnt even touch the N in normal. Coolant temp is a very goofy very variable thing.