I installed a coolant filter yesterday on my 2005 F-350 PSD. No issues with the install. I got a chance to take it out on the open road today and I noticed my EOT/ECT deltas are 2 degrees higher than before installing the coolant filter.
Deltas before the filter install were 6-8 degrees. After the install 8-10 degrees.

Has anyone else seen this? My theory is the the small amount of coolant leaving the block early is lowering the ECTs a few degrees. But I am a little puzzled.

The outside temp was in the high 40's.

 

What was ECT at when you took the readings????190*??


Are all your ECT & EOT & TFT the same or within 1 or 2* after a 12 hour cold soak???? At Startup

 

The cold soak temps are spot on.

The ECT didn't go up to 190. The max I saw was 188 which kind of confirms the fact that the small amount of coolant going around the bypass filter is causing the engine to run a few degrees cooler.

If i get a chance today I will do some tests with shutting the bypass and watch the temps and then open the bypass and see what changes.

 

Why would the small amount of coolant going around the bypass cause the engine to run cooler? You aren't bypassing the t-stat.

 

I'm pretty sure the coolant bypass circuit is not bypassing the t-stat

 

Delta temps are constantly changing as engine load changes, outside air temp changes, etc. I don't believe you can really say you have 2° difference after the install. The values are not steady enough to make such a precise determination.

Relax. Don't worry. Be happy.

 

I agree with Bill^^^

2* is Nothing

188* ECT is very Common Hell thats where my truck runs

 

Actually it does. Your t-stat limits flow to the radiator, so that the engine will warm up and maintain a constant temperature. Your heater core uses coolant directly from the engine, and is not controlled by the t-stat. The coolant filter installs in the heater core circuit.

I don't really think there is enough extra cooling from the filter circuit to make any difference in what you see on a temp gauge. Like I said, the temp is constantly moving up and down, and you wouldn't notice 2°. But theoretically it could make a difference, because it is added coolant flow that bypasses the t-stat.

I also think your t-stat is a bit on the tired side. You could use a few more degrees of running temp. Not a big deal yet, but keep an eye on it.