04 D2 Running hot under load

[3ac3]

By the way, for what its worth now, You didn't specify but which OEM 180 degree thermostat do you have? There are more than one with the same PEL500110 part number. There is the grey one and two versions of white called OEM 180 degree stats. I've found the grey one to run 10 degrees cooler than the white ones.

I have the grey one. White ones are the junk Motoraid version.

 

[3ac3]

This. Only get the grey Genuine one. I think the white ones are OEM and don't seem to give the same results as the grey one.

Also, even if a liner is slipped, I don't think it would necessarily mean your truck would overheat. I thought I read somewhere that you'd get some noise but for the most part, that's all. JimmyJamz could probably confirm.

One of my 04's had a block replaced under warranty due to a liner slip and it never overheated. I just got a CEL and brought it in. The next think you know, my truck is at the dealer for 3+ months waiting for the new short block.

No CEL at all. Only the knock sensor code and the overheating on long drives/under load. Other than that the truck runs well with no other issues.