Pressure Relief Remote Thermostat
A Pressure Relief Remote Thermostat (PRRT), or sometimes just PRT, is used to increase the amount of coolant flowing around the engine.
How?
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PRRT Colours
The kit (including all the hoses) is PCH001190 (Land Rover Part Number) and has a cream 87° stat.
Cream is 87° With Medium Spring
Black is 82° With Hard Spring (Not suitable for Rover K engines)
Grey is 82° With Light Spring
Land Rover Part number for grey stat (full hoses kit, similar to PCH001190 but with a non useable plastic elbow with small takeoff) is PEL500150
Land Rover part number for grey stat (standalone) is PEL500110
WARNING THIS INFORMATION MAY BE INCORRECT
The downside with the cream PRRT is that the stat won't open below 1500-1750 rpm due to the sping rate?
For DIY instructions on fitting please see the how to fit a PRRT guide.