Bleeding the K-Series Cooling System no longer a chore. - MG-Rover.org Forums
 1Likes
  • 1 Post By MGJohn
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 12 (permalink) Old 19-05-2017, 23:40 Thread Starter
Supporter
 
MGJohn's Avatar
 
Join Date: Jul 2003
Location: Gloucestershire - Cotswold Cockney
Car: MG Montego Turbo; 620ti x3; MG ZS; MGF and MG ZT 1.8t x2; MG ZT-T x1
Posts: 21,254
Cool Bleeding the K-Series Cooling System no longer a chore.

Long since lost count of the times I've bled the Cooling System of Air from K-Series MG and Rover Engines.

There has to be a better way .... and there is as I discovered recently by trial and error.

I used my trusty Funnel and length of garden hose which for years enabled me to effectively fill the PG1 Gearboxes with little lubricant losses. This set up works well. :~



With that in mind and using a shorter length of garden hose with a Coolant Hose Off-Cut placed on the end. This locates over the 8mm Bleed Bolt Hole location on the metal coolant tube above the bell housing providing and effective seal.

Then, holding the funnel a shade higher above the Coolant Expansion Bottle with the garden hose located over the bleed bolt location ~ 8mm Bleed Bolt removed of course ~ pour coolant in until it rises and reaches the MAX Index in the Expansion Bottle. Then, immediately remove the hose from the Bleed Bolt location and quickly replace the 8mm Bolt. It works remarkably well. Just be patient adding a little coolant to the Funnel each time until correct level is reached.

Done this to three 1.8T K-Series ZT-T engines now. Wish I'd sussed out this speedy method years ago. This is the simple Funnel and short piece of Garden Hose arrangement. You may need to find a rubber hose ( old piece of coolant hose Off-Cut of suitable dimensions is what I used ) to fit on the end of the garden hose for some bleed bolt locations as the size varies from car to car. As it happens, the Garden Hose off cut alone fitted over it without the need for the rubber hose off cut on one car. :~



Here it is in place at end of topping up bleeding process. :~

ROVER-25X likes this.

Apparently ... in a parallel universe MGJohn drives .........A.......

B>>M>>W ....

Arrrrrggghhhhh......... ......
MGJohn is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 20-05-2017, 11:14
gnu
Supporter
 
gnu's Avatar
 
Join Date: Mar 2010
Location: Bristol
Car: MG ZS & Rover 200
Posts: 4,071
Blog Entries: 15
Garages
I've bled a few K's as well. Tbh I've never really had the problems (airlocks etc) I see written about here though. I do wonder if there are other faults in the cooling system when these problems happen.

Usually I'd flush well, and with the heater on full, I just fill up through the expansion tank with the coolant rail bleed screw removed and pop the screw back in when the coolant reaches that level, then continue to fill to the max level and replace the cap. Run, for a bit, top up if necessary, then keep an eye on the level for a few weeks, topping up again if required.

gnu
gnu is offline  
post #3 of 12 (permalink) Old 26-05-2017, 03:18
Registered User
 
Join Date: Jun 2008
Location: ROCK FERRY, WIRRAL
Car: 25X, 25 1.6, 25 2.0D Rep:■■■■■■■■■■
Posts: 35,367
Might try this next time, nice one John.
ROVER-25X is offline  
 
post #4 of 12 (permalink) Old 26-05-2017, 09:11 Thread Starter
Supporter
 
MGJohn's Avatar
 
Join Date: Jul 2003
Location: Gloucestershire - Cotswold Cockney
Car: MG Montego Turbo; 620ti x3; MG ZS; MGF and MG ZT 1.8t x2; MG ZT-T x1
Posts: 21,254
Thumbs up

Quote:
Originally Posted by ROVER-25X View Post
Might try this next time, nice one John.
Lost count of the number of K-Series cooling systems I have flushed, charged with fresh coolant and bled over the years. Fiddly time consuming job rather than difficult.

Accessing that 8mm Bleed Bolt is not easy as so many things in the way.

This simple technique just makes bleeding the system so much more effective and efficient. Seeing the coolant rise to the MAX level in the Opaque Coolant Expansion Bottle on K-Series 75s and MG ZTs is so reassuring.

Here is the simple stuff I used to good effect :~




Apparently ... in a parallel universe MGJohn drives .........A.......

B>>M>>W ....

Arrrrrggghhhhh......... ......
MGJohn is offline  
post #5 of 12 (permalink) Old 27-05-2017, 11:38
Registered User
 
Join Date: May 2017
Car: CityRover
Posts: 5
Any one help Ive bought a mg zr this week and it's been red hot and the fan has not come on once I've changed the brown temp sensor at the front of the engine on the right and it still doesn't come on help please
Deano364 is offline  
post #6 of 12 (permalink) Old 27-05-2017, 12:49 Thread Starter
Supporter
 
MGJohn's Avatar
 
Join Date: Jul 2003
Location: Gloucestershire - Cotswold Cockney
Car: MG Montego Turbo; 620ti x3; MG ZS; MGF and MG ZT 1.8t x2; MG ZT-T x1
Posts: 21,254
Quote:
Originally Posted by Deano364 View Post
Any one help Ive bought a mg zr this week and it's been red hot and the fan has not come on once I've changed the brown temp sensor at the front of the engine on the right and it still doesn't come on help please
If you disconnect the sensor's connector with ignition on, does the Rad fan spin up?

Apparently ... in a parallel universe MGJohn drives .........A.......

B>>M>>W ....

Arrrrrggghhhhh......... ......
MGJohn is offline  
post #7 of 12 (permalink) Old 27-05-2017, 14:33
Registered User
 
Join Date: May 2017
Car: CityRover
Posts: 5
Yes the fan comes on
Deano364 is offline  
post #8 of 12 (permalink) Old 27-05-2017, 14:36
Registered User
 
Join Date: May 2017
Car: CityRover
Posts: 5
I've changed the sensor too and it still doesn't come on but the temp gauge never goes above half
Deano364 is offline  
post #9 of 12 (permalink) Old 27-05-2017, 21:26
Registered User
 
Join Date: Feb 2005
Location: Near Lincoln
Car: 06 MG ZR+120
Posts: 8,415
Quote:
Originally Posted by Deano364 View Post
..... I've changed the brown temp sensor at the front of the engine on the right and it still doesn't come on .....
There shouldn't be a brown sensor on a ZR or 25. The brown sensor was for the coolant temperature gauge on the 1995 to 1999 Rover 200, (the gauge sensor for the 25 and ZR is blue). This sensor is mounted underneath the coolant elbow. The coolant temperature sensor for the ECU (and which controls the radiator fan) is the one that is mounted in the front of the coolant elbow, and should be black in colour.

If you have a brown sensor in there, that will probably be why the fan doesn't work. If you unplug this sensor with the ignition switched on, the fan should start anyway (if the ECU is not recieving a signal from the sensor, it defaults to switching it on anyway. If the fan still does not run with the sensor disconnected, it will either be damaged wiring to the fan (or blown fuse), or the fan motor is u/s.
Man in the Car is offline  
post #10 of 12 (permalink) Old 28-05-2017, 14:59
Registered User
 
Join Date: May 2017
Car: CityRover
Posts: 5
The black has a different thread and also the wire wnt plug into it because it's a different style
Deano364 is offline  
post #11 of 12 (permalink) Old 31-05-2017, 09:51
Registered User
 
Join Date: May 2017
Car: CityRover
Posts: 5
I can't get my fan to work I've got the 2005 model zr were the sensor at the front is brown and the one underneath is blue does anyone know wich sends the signal to the ecu for the fan to start been trying to sort this for two week now help please it's driving me crazy
Deano364 is offline  
post #12 of 12 (permalink) Old 31-05-2017, 16:27
Registered User
 
Join Date: Feb 2005
Location: Near Lincoln
Car: 06 MG ZR+120
Posts: 8,415
As said before - the one that switches the radiator fan via the engine ECU is the one that points directly forwards from the coolant elbow. On a Rover 25 or MG ZR (which have a MEMS3 engine ECU) it should be a black sensor. The one underneath the elbow (blue) only supplies a signal to the temperature gauge in the instrument cluster.

A brown sensor won't work with the MEMS3 engine ECU as it is for the earlier K series engines fitted to the bubble Rover 200 and 400 (which had a MEMS 1.9 engine ECU) - if you have a brown sensor fitted to a MEMS3 2005 model MG ZR, this is why your radiator cooling fan doesn't work.

However, the fans rarely come on anyway in normal driving (unless you are in very slow moving or stationary traffic), so if the coolant is getting excessively hot under normal driving speeds, you probably have a more serious problem than just the wrong CTS.
Man in the Car is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MG-Rover.org Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
mg zs td cooling system bleeding peteblackpool MG ZS / Rover 45 & 400 12 30-07-2013 23:09
bleeding the cooling system? steve95 MG ZS / Rover 45 & 400 2 19-05-2013 17:10
Bleeding cooling system knight_templar MG ZT / Rover 75 (Sponsored by Rimmer Bros) 5 22-02-2011 17:40
Bleeding the cooling system davy800 MG ZR / Rover 25, 200 & Streetwise 11 12-12-2007 10:44
Bleeding cooling system!! colind9 Diesel Forum! 2 27-11-2007 17:23

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome