Temp switches

[oldiesel]

Preparing for hot summer towing a small Scamp camper with our 87TD and reading all i can find about the borderline cooling system. I see references to Red switch,Blue switch,Grey switch for the aux fan switch. Does anyone have part numbers and temp ratings for these various switches.I have the dreaded #14 cylinder head that is OK right now and would like to keep it that way even if it means running the engine a bit cooler than maximum efficiency would require.I am on a dialup internet connection so cannot use the EPC and even if i could i dont believe i could look these switches up by color. All or any help will be greatly apreciated. TIA Don