75 1.8 K Series Over Heating

BERNIED · 1st April 2009, 08:23

November last year HGF failure replaced(modification),week later fan failure ,replaced along with thermostat water pump.Now when ever i work the engine just the slightest bit hard overheats again.I can poodle along to work back and forward 10 miles round trip all ok,keeping revs under 3000,garage now sugesting cylinder head failure.gratefull for any comments.

T-Cut · 1st April 2009, 09:12

I'd say the coolant level is probably low (leak or airlock) leading to overheat.
Do you check the coolant religiously? If the coolant is always low, HGF is almost inevitable.
When you've got it sorted, run the display in diagnostic mode to see a proper temperature reading while running.
Get the new gauge from Hans Schaaper.

Kandyman · 1st April 2009, 09:33

Hi Bernied,

Welcome to the forums

Have a read of T-Cuts thread Monitoring Engine Temperature.

http://www.the75andztclub.co.uk/foru...iagnostic+mode

jcwatrichmond · 2nd April 2009, 07:35

Bernie,
If it's overheating be very careful or you'll need another head gasket. Check again for leaks.
One possibility is that you have an airlock somewhere in the cooling system. This can easily happen if it isn't refilled properly.
It varies with the different engine sizes, but with the 1.8:
1 Remove the bleed screw in the hose between between the engine and air cleaner.
2 Remove the filler cap and slowly pour in the new coolant, keeping the level just below the neck, until coolant comes out of the bleed screw in a steady stream.
3 Refit and tighten the bleed screw.
4 Continue slowly filling until the level is just below the filler neck. Leave the cap off.
(if you have AC, leave it switched OFF)
5 Start the engine and let someone run it at 1500 – 2000rpm.
6 Top up if required to keep the level just below the neck. When the level starts to rise due to heat expansion, refit the cap and tighten securely.
7 Keep at fast idle until the cooling fan comes on, then reduce to normal idle until the fan cuts out. Switch off and allow to cool, preferably overnight.
8 When cool, check for signs of leaks and check the level. Top up to MAX if required. (Haynes)
John Wright

1st April 2009, 08:23	#1
BERNIED Newbie ROVER 75 1.8SE Join Date: Mar 2009 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	75 1.8 K Series Over Heating November last year HGF failure replaced(modification),week later fan failure ,replaced along with thermostat water pump.Now when ever i work the engine just the slightest bit hard overheats again.I can poodle along to work back and forward 10 miles round trip all ok,keeping revs under 3000,garage now sugesting cylinder head failure.gratefull for any comments.

1st April 2009, 09:12	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,754 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I'd say the coolant level is probably low (leak or airlock) leading to overheat. Do you check the coolant religiously? If the coolant is always low, HGF is almost inevitable. When you've got it sorted, run the display in diagnostic mode to see a proper temperature reading while running. Get the new gauge from Hans Schaaper. Last edited by T-Cut; 2nd April 2009 at 10:42..

2nd April 2009, 07:35	#4
jcwatrichmond Loves to post Rover 75 1.8T 2003 Club SE Join Date: Jan 2009 Location: Solihull, Posts: 370 Thanks: 0 Thanked 0 Times in 0 Posts	Bernie, If it's overheating be very careful or you'll need another head gasket. Check again for leaks. One possibility is that you have an airlock somewhere in the cooling system. This can easily happen if it isn't refilled properly. It varies with the different engine sizes, but with the 1.8: 1 Remove the bleed screw in the hose between between the engine and air cleaner. 2 Remove the filler cap and slowly pour in the new coolant, keeping the level just below the neck, until coolant comes out of the bleed screw in a steady stream. 3 Refit and tighten the bleed screw. 4 Continue slowly filling until the level is just below the filler neck. Leave the cap off. (if you have AC, leave it switched OFF) 5 Start the engine and let someone run it at 1500 – 2000rpm. 6 Top up if required to keep the level just below the neck. When the level starts to rise due to heat expansion, refit the cap and tighten securely. 7 Keep at fast idle until the cooling fan comes on, then reduce to normal idle until the fan cuts out. Switch off and allow to cool, preferably overnight. 8 When cool, check for signs of leaks and check the level. Top up to MAX if required. (Haynes) John Wright Last edited by jcwatrichmond; 2nd April 2009 at 07:40..

1st April 2009, 09:33	#3
Kandyman Banned ROVER 75 2.5 V6 Connoisseur SE Limousine 2004 Join Date: Oct 2006 Location: Welling Posts: 10,995 Thanks: 0 Thanked 2 Times in 2 Posts	Hi Bernied, Welcome to the forums Have a read of T-Cuts thread Monitoring Engine Temperature. http://www.the75andztclub.co.uk/foru...iagnostic+mode