on 2000 XKR- do you fill the cooling system from the coolant reservoir on top of the engine or by the overflow recovery tank. Since the sensor it in the reservoir, I am guessing that it where you care about the level and by the way, where exactly is the overflow recovery tank hiding.

Thanks

Tom in Dallas

 

The reservoir.

Behind the left wheel well lining to the rear.

 

Now where do you fill the cooling system from- the overflow or the reservoir where the level sensor is? Is the overflow tank just merely that- an overflow tank. Does the system draw water from the overflow tank at any point? What type of pressure does the overflow tank operate under- system pressure or atmospheric pressure.

TB in Dallas

 

You fill the reservoir and then the pressure cap takes care of everything from there.

Coolant is recovered from the overflow tank to the reservoir due to the vacuum created by the cooling engine. Sometimes, with older hoses, the vacuum can be strong enough to collapse the upper radiator hose.

 

On an XKR, you neeed to fill from both the overflow recovery tank AND top off resevoir on top of the engine (with the 19mm hex bolt) between the two heat exchangers.

And it is the overflow recovery tank that has the level sensor.

 

Thanks. So is that a difference between the XK8 and the XKR both location f sensor and how they are filled?

TBB in Dallas