New problem for me.

Terryf · 22nd March 2019, 14:07

A few days ago I fitted a HUD to my windscreen to show coolant temp, among other things. Today I saw coolant temp go to 117c . I thought that will be wrong and glanced down to look at the dash gauge. I was horrified to see it at the 11 o'clock mark.
I have checked coolant level OK, oil level OK, high speed fan roaring like a banshee, ok
I am beginning to suspect the thermostat.
I have Kaisers metal housing fitted with the lower opening temp.
From the windscreen gauge it appears to open around 93c and drops a few degrees, then continues to rise again 100+ drops a bit then goes on up.
Waiting for the mechanic now,
Any suggestions gratefully accepted.

madeupname · 22nd March 2019, 14:24

when this happened on mine it was a large air bubble in the coolant.
After trying all sorts to sort it out I followed advice on here and refilled the system from the expansion tank with the bleed nut open and the engine running. It flows round slow enough to put the bleed nut back and switch off before the expansion tank gets too low.

klarzy · 22nd March 2019, 15:01

Could the HUD you fitted be effecting the feedback from the thermostat?? If you disconnect it, does the ipk dial return to normal..??

Terryf · 22nd March 2019, 15:59

Quote:

Originally Posted by klarzy

Could the HUD you fitted be effecting the feedback from the thermostat?? If you disconnect it, does the ipk dial return to normal..??

Thanks Klarzy, never thought of that, will check.

Terryf · 23rd March 2019, 12:30

Quote:

Originally Posted by Terryf

Thanks Klarzy, never thought of that, will check.

No that's not it, no change went HUD gauge disconnected.
But did find when dash gauge was showing normal and HUD gauge showing 107c radiator top hose was almost cold.
Terry

Yorkshire GOC · 23rd March 2019, 13:17

If you had really reached 107 would not the high speed fan kick in - on the 1.8t its would kick in at 105 and stay on until back to 92 -not sure about the V6 but i assume the same principle applies. Is your HUD faulty - have you run the onboard temp display (19/07) to compare the two. When i had a Hans Gauge fitted i did this to ensure they both were giving the same output - which they did.

P-Nut · 23rd March 2019, 13:54

It's 108-112c for the KV6 high fan kick in speed

Terryf · 23rd March 2019, 18:58

Quote:

Originally Posted by Yorkshire GOC

If you had really reached 107 would not the high speed fan kick in - on the 1.8t its would kick in at 105 and stay on until back to 92 -not sure about the V6 but i assume the same principle applies. Is your HUD faulty - have you run the onboard temp display (19/07) to compare the two. When i had a Hans Gauge fitted i did this to ensure they both were giving the same output - which they did.

Thanks I forgot about that one. But as the radiator top hose was almost cold I think that may be the problem.
Terry

22nd March 2019, 14:07	#1
Terryf Gets stuck in Rover 75 Saloon BRG Join Date: Jun 2007 Location: Retford Posts: 573 Thanks: 119 Thanked 142 Times in 69 Posts	New problem for me. A few days ago I fitted a HUD to my windscreen to show coolant temp, among other things. Today I saw coolant temp go to 117c . I thought that will be wrong and glanced down to look at the dash gauge. I was horrified to see it at the 11 o'clock mark. I have checked coolant level OK, oil level OK, high speed fan roaring like a banshee, ok I am beginning to suspect the thermostat. I have Kaisers metal housing fitted with the lower opening temp. From the windscreen gauge it appears to open around 93c and drops a few degrees, then continues to rise again 100+ drops a bit then goes on up. Waiting for the mechanic now, Any suggestions gratefully accepted.

22nd March 2019, 14:24	#2
madeupname Posted a thing or two Rover 75 Connie Mk2 1.8 (Mo) Join Date: Feb 2017 Location: Sheffield Posts: 1,531 Thanks: 875 Thanked 335 Times in 289 Posts	when this happened on mine it was a large air bubble in the coolant. After trying all sorts to sort it out I followed advice on here and refilled the system from the expansion tank with the bleed nut open and the engine running. It flows round slow enough to put the bleed nut back and switch off before the expansion tank gets too low. __________________ Mo was born Tuesday, 22nd June 2004 @ 08:32:41 This vehicle was the 99,307th 75 to run off the production line, out of 112,381 This vehicle was the 5,377th 75 1.8 Connoisseur to be made out of 6,033 This vehicle was the 783rd 75 in Firefrost Red (code: CEV) to be made out of 2,089 Firefrost Red 75s

22nd March 2019, 15:01	#3
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Could the HUD you fitted be effecting the feedback from the thermostat?? If you disconnect it, does the ipk dial return to normal..?? __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

23rd March 2019, 13:17	#6
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	If you had really reached 107 would not the high speed fan kick in - on the 1.8t its would kick in at 105 and stay on until back to 92 -not sure about the V6 but i assume the same principle applies. Is your HUD faulty - have you run the onboard temp display (19/07) to compare the two. When i had a Hans Gauge fitted i did this to ensure they both were giving the same output - which they did. __________________ 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.

23rd March 2019, 13:54	#7
P-Nut Gets stuck in MG ZT 190+ Join Date: Nov 2012 Location: North Shields Posts: 561 Thanks: 143 Thanked 170 Times in 103 Posts	It's 108-112c for the KV6 high fan kick in speed __________________ Approved food eater

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