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I’m still having a little problem with engine temp gauge climbing higher than I’m comfortable seeing it on the factory gauge when pulling heavy up a long steep climb. No idea of the real temp so I bought an actual gauge. I’ll install it tonight if it cools off enough. Can I put the sensor in the plug that’s on the side of the water pump?
So, I have installed coolant gauges on two of my trucks. 190* is the norm for me. 200* if I push it hard. Maybe these numbers can help you establish a baseline for coolant temp. Especially if you're having some problems.
I'd be curious about the relationship you see between coolant and EOT. EOT is more important of the 2 imo, but I'm thinking if coolant temp is climbing well above EOT that's a clue. Hopefully the second gauge tapped at the waterpump will track with dash gauge. If they get up there together, well above the EOT, I'd suspect clogged radiator fins.
When I replaced the water pump and flushed the coolant last month, I pressure washed the radiator and intercooler fins. I could see through both well. The A/C condenser is another issue, and I’m guessing thats the problem. I tried running a comb through and it helped a little. Most of the damage is pretty rough. I’m going to order a new condenser today. Hopefully I don’t have any issues getting back my last 250 miles home.
What David touched on is what I was getting at, but I was taking the long route to the answer. Just so you know, synthetic oil is good to ~450°.
The gap between ECT and EOT should be about 10°-20° if everything is working as intended. When I have reviewed my data logs during high ambient heat and heavy towing up grades, the EOT has peaked at 225°.
Each of these trucks are different and some others have reported temperatures up toward 240°. If they are using synthetic oil, this is not as big a concern as if they are using conventional oil. Conventional oil starts to break down ~250°.
One member claimed he regularly saw 265° EOT, but his memory of the temperature noted may have been in question due to other issues going on with the truck he owned at the time.
What I am saying is you may or may not have an issue. You may just need to establish a baseline of what your truck reads for EOT and ECT and go from there. You are taking the right steps though with installing a gauge for ECT and the new condenser. Being proactive is much easier than being reactive in situations like this.
My ECT is normally 200 to 208 and can hit 212 when climbing, I don't think that is too hot, even my old 6.9 ran around those same temps. Presently running a 203 stat but doesn't make much difference. Too cold has it's drawbacks as well. Will be interesting to see what yours are since the factory gauge setup is stepped if I recall.
