Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
What is this cap?
Anyone able to tell me what this cap does please?
Small black one next to main cap on coolant reservoir.
I fit it myself the other day and noticed today the coolant was stuck at the top. I undid it slightly and the trapped liquid drained it’s self.
Should I leave it open or closed?
7th Oct 2020 6:26 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Usually best to know what it does before doing something with it.
It is used to bleed air out of the coolant system:
Quote:
19 . Loosen the coolant expansion tank bleed screw.
20 . Loosen the cylinder head bleed hose bleed screw.
21 . Refill the cooling system.
22 . Tighten the bleed screws to 14 Nm (10 lb.ft).
23 . Fill the cooling system, keeping coolant to the upper level mark of the expansion tank, until a steady stream of coolant is seen returning to the tank.
24 . NOTE :
When the coolant bleed is complete and prior to installing the expansion tank cap, top up the expansion tank to 30mm above the maximum level.
Install the coolant expansion tank cap.
25 . WARNING: Release the cooling system pressure by slowly turning the expansion tank cap a quarter of a turn. Cover the expansion tank cap with a thick cloth to prevent the possibility of scalding. Failure to follow this instruction may result in personal injury.
Start and run the engine.
Hold the engine speed at 3,000 RPM for one minute.
Return the engine to idle for five minutes.
Hold the engine speed at 3,000 RPM for one minute.
Run the engine until the thermostat opens.
Remove coolant expansion tank cap, allow float to settle and top-up coolant if required. Install cap.
26 . Switch the engine off and allow to cool.
27 . Install the engine cover.
28 . Clean any remaining coolant from the chassis and surrounding area.
29 . Install the radiator access panel.
Tighten the 4 bolts to 10 Nm (7 lb.ft).
30 . Check and top-up the coolant if required.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 15 Jan 2016
Location: GL
Posts: 10407
Leave it closed !
7th Oct 2020 7:55 pm
cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
Sorry I’m struggling to understand the coolant bleed method. And I’ve just replaced the reservoir as it was broken...
So I fill it up with coolant on a flat surface. Tighten the bleed screw in the tank. Keep bleed hose screw open and tank cap. Start the engine and then screw hose bleed tight once it’s running smooth liquid.
Then top up tank to correct level and close cap?
7th Oct 2020 7:58 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72856
Robbie wrote:
Usually best to know what it does before doing something with it.
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