Over heating issue driving me nuts

Anon1 · 18th May 2018, 11:19

I have had an issue with my car for a few weeks which pointed to the thermostat. I was losing coolant also.
The temp guage was bouncing up n down between norman and red. The fan was coming on at to speed and then staying on for a good 5 to 10 mins after engine turn off
So i swapped out the old stat and housing for a genuine mgr one. Topped up the coolant. That was tuesday. Ran it for about 15 miles. Topped it up wed and thursday morning. Car ran with no issues.
Checked this morning and coolant is at correct level in the header tank.
Also installed new engine temp sensor.
Get 2 miles down road if that. Fan kicks in. I listened for it to cut out as per usual. It doesn't. The temp gauge then rises a fraction. Then bounces between normal and 3/4 mark.
What else can it be?
coolant if fine. New stat. No leaks or air locks as fan gets red hot on economy.
Fan is now coming on as soon as engine turns on and takes ages to go off.
Could it be the guage its seld sending mixed messages?

Sent from my SM-G925F using Tapatalk

Yorkshire GOC · 18th May 2018, 12:39

A few years ago i had similar with coolant loss and fan staying on when parking up -this is what alerted me - turned out to be a failing IM gasket - however did not get any temp gauge issues. If i am losing coolant and the reason is not obvious i get her on ramp at a local garage and do a coolant pressure test - in the case of the failing IMG it took nearly an hour on the ramp before it started leaking visibly - when the engine was good and hot.

Anon1 · 18th May 2018, 15:13

Quote:

Originally Posted by Yorkshire GOC

A few years ago i had similar with coolant loss and fan staying on when parking up -this is what alerted me - turned out to be a failing IM gasket - however did not get any temp gauge issues. If i am losing coolant and the reason is not obvious i get her on ramp at a local garage and do a coolant pressure test - in the case of the failing IMG it took nearly an hour on the ramp before it started leaking visibly - when the engine was good and hot.

i am not losing coolant now

Yorkshire GOC · 18th May 2018, 15:36

Thats what happened to me - i only lost coolant when the engine had been running for a while - on short journey's no coolant loss - only when the heat of an engine under load caused the IMG to leak - hence it took an hour of running on a ramp before the leak was evident.

Anon1 · 18th May 2018, 18:36

Quote:

Originally Posted by Yorkshire GOC

Thats what happened to me - i only lost coolant when the engine had been running for a while - on short journey's no coolant loss - only when the heat of an engine under load caused the IMG to leak - hence it took an hour of running on a ramp before the leak was evident.

img is ok as it was only replaced in December

kaiser · 18th May 2018, 20:21

Don't assume, check!
Which model do you have?

GRANDAD LES · 18th May 2018, 20:52

Hi, what is the I.M.G. please?

anddyy · 18th May 2018, 22:48

Quote:

Originally Posted by GRANDAD LES

Hi, what is the I.M.G. please?

Inlet Manifold Gasket

Vanbursta · 19th May 2018, 10:18

Engine Temp sensor faulty or more likely wiring thereto, the engine thinks it hot when it isn't. Try a different sensor as they can be faulty when new.

stocktake · 19th May 2018, 10:58

You also need to run the on board temp display in the IPK to show the actual temperature the sensor is recording, the temp gauge is not accurate staying at the nine oclock position from 75 to 115 deg.

18th May 2018, 11:19	#1
Anon1 Banned Rover 75 Join Date: May 2018 Location: Cleveleys Posts: 47 Thanks: 3 Thanked 4 Times in 4 Posts	Over heating issue driving me nuts I have had an issue with my car for a few weeks which pointed to the thermostat. I was losing coolant also. The temp guage was bouncing up n down between norman and red. The fan was coming on at to speed and then staying on for a good 5 to 10 mins after engine turn off So i swapped out the old stat and housing for a genuine mgr one. Topped up the coolant. That was tuesday. Ran it for about 15 miles. Topped it up wed and thursday morning. Car ran with no issues. Checked this morning and coolant is at correct level in the header tank. Also installed new engine temp sensor. Get 2 miles down road if that. Fan kicks in. I listened for it to cut out as per usual. It doesn't. The temp gauge then rises a fraction. Then bounces between normal and 3/4 mark. What else can it be? coolant if fine. New stat. No leaks or air locks as fan gets red hot on economy. Fan is now coming on as soon as engine turns on and takes ages to go off. Could it be the guage its seld sending mixed messages? Sent from my SM-G925F using Tapatalk Last edited by Anon1; 18th May 2018 at 11:36..

18th May 2018, 12:39	#2
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	A few years ago i had similar with coolant loss and fan staying on when parking up -this is what alerted me - turned out to be a failing IM gasket - however did not get any temp gauge issues. If i am losing coolant and the reason is not obvious i get her on ramp at a local garage and do a coolant pressure test - in the case of the failing IMG it took nearly an hour on the ramp before it started leaking visibly - when the engine was good and hot. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

18th May 2018, 15:36	#4
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	Thats what happened to me - i only lost coolant when the engine had been running for a while - on short journey's no coolant loss - only when the heat of an engine under load caused the IMG to leak - hence it took an hour of running on a ramp before the leak was evident. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

18th May 2018, 20:21	#6
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	Don't assume, check! Which model do you have? __________________ Worth his V8 in gold

19th May 2018, 10:18	#9
Vanbursta Posted a thing or two Rover 75 2.0 V6 Conn Join Date: Apr 2007 Location: Stainton Grove Posts: 1,637 Thanks: 266 Thanked 406 Times in 257 Posts	Engine Temp sensor faulty or more likely wiring thereto, the engine thinks it hot when it isn't. Try a different sensor as they can be faulty when new. __________________ I am NOT a number, I am 75

18th May 2018, 20:52	#7
GRANDAD LES Loves to post ROVER 75 TOURER CONTEMP Join Date: May 2009 Location: LINDAL-IN-FURNESS Posts: 360 Thanks: 205 Thanked 23 Times in 16 Posts	Hi, what is the I.M.G. please?

19th May 2018, 10:58	#10
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,587 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	You also need to run the on board temp display in the IPK to show the actual temperature the sensor is recording, the temp gauge is not accurate staying at the nine oclock position from 75 to 115 deg. __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident