![Think... :think:](https://board.marlincrawler.com/Smileys/marlin/think.gif)
What year is the truck. There is a countermeasure cold start timer switch and also a countermeasure coolant temp sensor that toyota offered. some of the trucks needed it.
Toyota still offers both the original and the countermeasure. If you search you can find the very old tsb.
![Wave :wave:](https://board.marlincrawler.com/Smileys/marlin/wave.gif)