1996 cat 3126 check engine and derates

[Acephx]

My 1996 cat 3126 derates after running for a while. I have checked the radiator seems clean,but used simple green and strong hose from the inside aft. Taking it to caterpiller tomorrow. If they have to replace the thermostats, what is a fair price for that? The engine just barely hits 220 when it derates.

[TooTallTruck]

220* is too hot. I changed th thermostats in a KAL prefix C7 the other day. The parts were $38 without tax and I charged two hours. It took me slightly longer than that by the time I BS'd with the owner but the job is only 6 bolts, one hose clamp and draining and refilling the coolant. If you do it make sure to fill the radiator slowly to avoid bubbles or air locks. If I can help further please ask.

Joe

[Skip426]

Lee, Hi and Welcome to iRV2. Cant help you on price , mine were done at the same time as the water pump.
A few questions though.
How long does it take to over heat ? Idle or highway driving ? Side or rear radiator ? Is the rad fan picking up to full RPM when the engine heats up ?
Are you getting a warning light or a fault code when the derate occours?