1.8t...faulty heat reading...Never 9 o clock

VikingMG · 16th March 2019, 21:46

My zt 1.8t does not get hot(obviously it does) according too the speedo..
..NEVER reaches 9oclock while driving..Does not reach 9oclock position unless i leave it running for a while... when I hit the defroster and fan kicks in it drops rather quickly...

Do I have a termostat fault or what could this be?

Yorkshire GOC · 17th March 2019, 06:09

Sounds like a Thermostat fault - your appear to be running cool - failing that a faulty coolant temperature sensor - but personally i think the former.

LeRich · 17th March 2019, 07:54

Use the IPK diagnostics to get the engine temp readout when the car's running. The temp dial is never the most accurate.

My 1.8T runs slightly cool at a steady 83° as I fitted a cooler stat out of fear of it overheating (I am considering changing this to run warmer). Ideally the 1.8T should run around 88-92°.

Yorkshire GOC · 17th March 2019, 08:57

On my car -which has a Hans Gauge fitted - 9 o clock on the temp dial is reached in the early mid 70's - as you are not getting to 9 you seem to be running cool -which over time will damage the engine.

T-Cut · 17th March 2019, 09:51

The 9 o'clock/'Normal' point on the standard gauge is a temperature band of 75-115°C.
So, when the coolant reaches 75°C, the needle will reach 'Normal' even though it's way below true normal running tempertures. THe needle will stand there until/unless the engine gets hotter and hotter. But only at 115°C will it start to move. When that happens, something's clearly amiss and the usual next stage is a rapid rise to the top and the red warning light pops on. Basically, it's not worth the room it takes up. Think of it like this -

TC

VikingMG · 18th March 2019, 19:30

Its always lying at the second mark, 7 o,clockish....I have done the trip diagnostics thing and its a a steady 80-85 while running...

VikingMG · 18th March 2019, 19:32

Quote:

Originally Posted by Yorkshire GOC

On my car -which has a Hans Gauge fitted - 9 o clock on the temp dial is reached in the early mid 70's - as you are not getting to 9 you seem to be running cool -which over time will damage the engine.

Its a a steady 80-85 while running if I do the speedo coolant trip thing..

VikingMG · 18th March 2019, 19:34

Quote:

Originally Posted by LeRich

Use the IPK diagnostics to get the engine temp readout when the car's running. The temp dial is never the most accurate.

My 1.8T runs slightly cool at a steady 83° as I fitted a cooler stat out of fear of it overheating (I am considering changing this to run warmer). Ideally the 1.8T should run around 88-92°.

Its a a steady 80-85 while running if I do the speedo coolant trip thing....

T-Cut · 19th March 2019, 09:43

Quote:

Originally Posted by VikingMG

Its a a steady 80-85 while running if I do the speedo coolant trip thing....

Assuming there isn't a large glob of air in the engine (in which case it needs a refill and bleed), then the thermostat is faulty. It's supposed to stay closed up to 88C or so. Yours is causing the system over-cool. The 'normal' running temperature is in the 90C area. A new thermostat will fix it. Your 2005 model has an external PRT so a simple job almost anyone can do.

TC

VikingMG · 19th March 2019, 16:51

Yep..Ive been thinking of ordering a new from Mat...

16th March 2019, 21:46	#1
VikingMG Avid contributor MG ZT-T, R75 1.8T Tourer,R75 2,5 V6 Join Date: Sep 2016 Location: Bergen Posts: 170 Thanks: 77 Thanked 21 Times in 18 Posts	1.8t...faulty heat reading...Never 9 o clock My zt 1.8t does not get hot(obviously it does) according too the speedo.. ..NEVER reaches 9oclock while driving..Does not reach 9oclock position unless i leave it running for a while... when I hit the defroster and fan kicks in it drops rather quickly... Do I have a termostat fault or what could this be? __________________ This vehicle was the 6,701st ZT-T to run off the production line, out of 8,249 This vehicle was the 82nd ZT-T 160 (1.8T) to be made out of 118 This vehicle was the 1,309th ZT-T in XPower Grey (code: LEF) to be made out of 1,673 XPower Grey ZT-Ts

17th March 2019, 06:09	#2
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,062 Thanks: 1,842 Thanked 623 Times in 469 Posts	Sounds like a Thermostat fault - your appear to be running cool - failing that a faulty coolant temperature sensor - but personally i think the former. __________________ 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.

17th March 2019, 07:54	#3
LeRich Posted a thing or two Rover 75 Cont SE 1.8T Join Date: Aug 2010 Location: Cheshire Posts: 1,082 Thanks: 215 Thanked 232 Times in 178 Posts	Use the IPK diagnostics to get the engine temp readout when the car's running. The temp dial is never the most accurate. My 1.8T runs slightly cool at a steady 83° as I fitted a cooler stat out of fear of it overheating (I am considering changing this to run warmer). Ideally the 1.8T should run around 88-92°. __________________ Rover 75 1.8T Contemporary SE Auto Starlight Silver MBB

17th March 2019, 08:57	#4
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,062 Thanks: 1,842 Thanked 623 Times in 469 Posts	On my car -which has a Hans Gauge fitted - 9 o clock on the temp dial is reached in the early mid 70's - as you are not getting to 9 you seem to be running cool -which over time will damage the engine. __________________ 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 March 2019, 19:30	#6
VikingMG Avid contributor MG ZT-T, R75 1.8T Tourer,R75 2,5 V6 Join Date: Sep 2016 Location: Bergen Posts: 170 Thanks: 77 Thanked 21 Times in 18 Posts	Its always lying at the second mark, 7 o,clockish....I have done the trip diagnostics thing and its a a steady 80-85 while running... __________________ This vehicle was the 6,701st ZT-T to run off the production line, out of 8,249 This vehicle was the 82nd ZT-T 160 (1.8T) to be made out of 118 This vehicle was the 1,309th ZT-T in XPower Grey (code: LEF) to be made out of 1,673 XPower Grey ZT-Ts

17th March 2019, 09:51	#5
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,751 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The 9 o'clock/'Normal' point on the standard gauge is a temperature band of 75-115°C. So, when the coolant reaches 75°C, the needle will reach 'Normal' even though it's way below true normal running tempertures. THe needle will stand there until/unless the engine gets hotter and hotter. But only at 115°C will it start to move. When that happens, something's clearly amiss and the usual next stage is a rapid rise to the top and the red warning light pops on. Basically, it's not worth the room it takes up. Think of it like this - TC

19th March 2019, 16:51	#10
VikingMG Avid contributor MG ZT-T, R75 1.8T Tourer,R75 2,5 V6 Join Date: Sep 2016 Location: Bergen Posts: 170 Thanks: 77 Thanked 21 Times in 18 Posts	Yep..Ive been thinking of ordering a new from Mat... __________________ This vehicle was the 6,701st ZT-T to run off the production line, out of 8,249 This vehicle was the 82nd ZT-T 160 (1.8T) to be made out of 118 This vehicle was the 1,309th ZT-T in XPower Grey (code: LEF) to be made out of 1,673 XPower Grey ZT-Ts

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