[jdkskyking]

Here is a list of the parts I purchased to resolve the engine coolant fluctuation and high temp. I’m including photos to give you an idea of what’s involved to complete the work. 

As a reminder, Caterpillar C13 Acert engine for 2005 model. Limited number of Cat 13s used in production. 

Genuine Caterpillar Replacement Parts
Temperature Regulator 247-3133
PTFE Lip Seal 3S-9643 (temperature regulator seal, used Cat tool to seat the seal).
Valve Assembly-Vent Line 239-8135
Press-In-Seal 227-5075 (seal between upper and lower regulator housings)
CN Sensor Temp 264-4297 (updated temperature sensor)

O-Rings
6V-6609 used on Temp Sensor 
7L-6580  used on metal tube that extends down from upper coolant regulator housing. 

Coolant and Coolant Cleaner
Cat Coolant System Cleaner 4C-4611 (2 gal)
Coolant Cat ELC Premix 238-8648 (17 gal)

Tool Purchased
Caterpillar Seal Inserter 221-8647 used to inter the temp regulator seal into the housing. 
AirLift- used to fill coolant system utilizing vacuum.