Thread: Engine coolant bleed screw on a 99 3 litre s-type

Here's the recommended procedure;
Open the engine air bleed located on the crossover pipe.
Fill the expansion tank until the coolant flows from the engine air bleed screw and expansion tank is full.Close the engine air bleed screw.
Install the expansion tank cap.
Start the engine and set the heater to 29°C/90°F.Allow the engine to idle for 5 minutes, adding coolant to the expansion tank to maintain the COLD FILL MAX level.
Increase the engine speed to 1500 rpm for between three and five minutes or until the heater is blowing hot air.
Return to idle and verify that heater is blowing hot air.

Hi, thanks for the quick reply.
Is the bleed screw a black plastic valve that is set in a pipe about 25mm dia with a flat head slot in the top, that faces towards the front of the engine, if it is do you have to take it all the way out or just rotate through 90 degrees as seems the case.

I'm not familiar with the 3.0, but that description sounds bang on, yeah it doesn't come all the way out or anything just loosen it. Good Luck.

I had the same problem about 18 months ago and couldn't figure out if the plastic screw in the crossover pipe was the bleed-valve or not as it didn't seem to have any effect however far I turned it, I was expecting to hear the air hissing out but couldn't hear anything. In the end I disconnected the end of the pipe and waited until water came out then reconnected it again. That worked for me. Hope this helps - good luck!

I thinkl i have a similar problem could someone point me in the direction of the bleed off valve ive looked and looked and cant for the life of me see it :? cheers

Hi Thanks Heballi, the same seems to have happened to me, the little valve thing just turned with no release of air or water,so i decided to disconnect the pipe at the plastic T piece & try that.
The pipe came off really easily, as in broke off in my hand, (is everything plastic, brittle on Jags?) Bodged it at the moment, need a replacement T piece that includes the bleed screw, anyone got any idea where from, or is it Genuine Jag only?
So in summery: still rudy cold, with bodged pipe connections.

Originally Posted by The Wedding Car

need a replacement T piece that includes the bleed screw, anyone got any idea where from, or is it Genuine Jag only?

It's gonna be a genuine part only I'm sure. Unlucky about the breakage, I dunno if Jag are particularly bad, but any plastic that is heated and cooled repeatedly is gonna get brittle.

As for the lack of heat, have you set the climate to max temperature and given the engine a few revs for a few minutes, reading the JTIS cd, the bleed nipple is only used during filling, open it and fill till it comes out of there, close it, ensure the expansion bottle is at max then do the revs thing, sorry I can't offer any actual advice, I've never had the need on a Jag, I would recommend giving the pipes a squeeze as well to help move things round the system.