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Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Tue Dec 23, 2014 1:55 pm
by X5-D-Sport
I People,
The engine temperature readings were looking low, now it's getting colder didn't always get up to normal running temperature, so assumed the stat was jammed partly open, probably the original item 136,000 miles later, so was overdue for a change..

I have just looked up on YouTube where the thermostat lives & what to strip to change it....
No problems there then...

However, wondering if there are some air bleed points lurking around the cooling system here n there, or does this vehicle completely self bleed & just need topping up and drive away ???

Any facts about this would be most helpful please, before I take her to pieces.... and I don't want to blow a head gasket with an air-lock finding out the hard/expensive way...

:xmasgrin:  Many thanks in advance  :xmastongue:

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Tue Dec 23, 2014 6:08 pm
by shadrack
should self bleed

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Tue Dec 23, 2014 6:52 pm
by X5-D-Sport
Many thanks.

Was just wondering if there were any hidden bleed nipples lurking any where.

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Wed Dec 24, 2014 6:21 am
by Denis O
If you can, have the cars nose in the air. Any trapped air will try to find the highest point so make that the expansion bottle top.

It was the only way to do an e39 540.

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Thu Dec 25, 2014 12:22 pm
by X5-D-Sport
Mine's a 3.0 Diesel 2004.....  anything special to look out for, bleeding the air out ??

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Fri Dec 26, 2014 8:41 am
by Horizon
Run up to temperature with the cap off, all. The heater controls on full heat , as mentioned a good idea to have it nose high, some BMW reds vavw a bleed screw at the top of the red, lee e loose until a stream of war
Ter appears.  :)

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Mon Dec 29, 2014 7:02 pm
by moar
Alot of poor info dished out here.

Take the bleed screw off, start the engine with heater on low fan and to the face. Fill the expansion tank until fluid comes out of the bleed screw hole, screw the bleed screw on by only one turn and wait for the bubbles to disappear then tighten down the bleed screw. Cool down and top off.

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Mon Dec 29, 2014 7:40 pm
by Horizon
[quote="moar"]
Alot of poor info dished out here.

Take the bleed screw off, start the engine with heater on low fan and to the face. Fill the expansion tank until fluid comes out of the bleed screw hole, screw the bleed screw on by only one turn and wait for the bubbles to disappear then tighten down the bleed screw. Cool down and top off.
[/quote]

Is there an echo in here !  :))

We've missed your self important advice, Welcome back :'(

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Mon Dec 29, 2014 7:47 pm
by moar
I've been busy  ;)

You need to fill up with the screw off until water comes out.

You version didn't make this clear.

Re: Thermostat Change - BLEEDING AIR FROM COOLING SYSTEM

Posted: Mon Dec 29, 2014 9:21 pm
by X5-D-Sport
Thank you guys, appreciated... doing this job tomorrow