The 75 and ZT Owners Club Forums - View Single Post - The Function and Malfunction of the Diesel Thermostat

Mike Noc · 20th January 2012, 20:26

Good question but unfortunately I threw my old water pump out so can only agree with the earlier suggestion that it is part of a pressure relief system.

That would make sense with the difference in diameters of the radiator cooling and heater matrix circuit pipework, but it needs confirming.

It also allows the thermostat wax bulb to be in the direct flow of the closed circuit of the heater matrix so there is no need for any holes in the thermostat main valve.

Mike

20th January 2012, 20:26	#7
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,571 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Good question but unfortunately I threw my old water pump out so can only agree with the earlier suggestion that it is part of a pressure relief system. That would make sense with the difference in diameters of the radiator cooling and heater matrix circuit pipework, but it needs confirming. It also allows the thermostat wax bulb to be in the direct flow of the closed circuit of the heater matrix so there is no need for any holes in the thermostat main valve. Mike Last edited by Mike Noc; 20th January 2012 at 20:34..