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Old 12th September 2023, 13:21   #1
Tenesmus
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Default Engine High Temperature Warning

5 minutes into my drive home I realised the temperature gauge was at 12 o'clock, the red light on and the "High Temperature" message. A few seconds later the message disappeared and the gauge dropped instantly to normal 9 o'clock, and stayed there for the rest of the journey, about 15 minutes.

A blip? The initial signs of a failing thermostat? Any ideas?
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Old 12th September 2023, 14:18   #2
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My first thought would be an airlock following such an incident
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Old 12th September 2023, 14:45   #3
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I've just remembered there was a bang or pop seconds before I saw the warning. I assumed it was something falling out a tree onto the roof, but could it be connected?
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Old 12th September 2023, 15:53   #4
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When she is cool see what the coolant level looks like in the expansion tank - is it normal ?
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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.
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Old 12th September 2023, 16:30   #5
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A slight hiss and no sign of any coolant through the top (you can't see anything through the side where the min max is, which means there's nothing there or the plastic is too opaque to see if there is).
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2016 Vauxhall Viva SL (Father Jack) "assisted manual" (auto) in purple. Going rusty underneath already...

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Old 12th September 2023, 18:56   #6
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Quote:
Originally Posted by Tenesmus View Post
A slight hiss and no sign of any coolant through the top (you can't see anything through the side where the min max is, which means there's nothing there or the plastic is too opaque to see if there is).
Look straight down into the tank when the lid is off, you can see the max setting, it's a lot lower than most folk think.

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Old 12th September 2023, 19:12   #7
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Like Trikey says, look at the bottom of the header tank, with the cap off. You will see some ‘fins’ at the bottom. The water should just be above the bottom of the fins. The bottom, NOT at the top of the fins.
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Old 13th September 2023, 07:13   #8
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Exclamation Coolant level: clarification

Quote:
Originally Posted by bl52krz View Post
The water should just be above the bottom of the fins. The bottom, NOT at the top of the fins.
Maintaining the correct coolant level couldn't be simpler and it doesn't involve the fins!
  1. When the engine is stone cold remove the expansion tank cap
  2. Top-up the coolant until it covers the tab marked MIN and just reaches, but does not obliterate, the tab marked MAX.
  3. Refit the expansion tank cap. Do not over-tighten it.
In the past, references to the fins have misled owners into overfilling the cooling system, experiencing coolant ejection and then panicking about head gasket failure. The MIN and MAX markings are the only guide that is necessary.

Tenesmus; you've indicated that your expansion tank is empty. You need to fill it to the MAX marker and urgently investigate the reason for the coolant loss. Begin by checking inside the 'V'.

Simon
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Old 13th September 2023, 23:12   #9
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Thanks chaps. I haven't had a chance to do anything except top it up to just above the MIN (didn't take much) and put the container in the boot.

I'll be disappointed if it's the thermostat (assuming that's why you mentioned checking in the V), it's already been replaced twice.
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2016 Vauxhall Viva SL (Father Jack) "assisted manual" (auto) in purple. Going rusty underneath already...

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Old 14th September 2023, 16:52   #10
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Quote:
Originally Posted by SD1too View Post
Tenesmus; you've indicated that your expansion tank is empty. You need to fill it to the MAX marker and urgently investigate the reason for the coolant loss. Begin by checking inside the 'V'.

Simon
Give the man a cigar. With the help of a bright torch you can clearly see the colourful puddles. Thanks for the help.

I had one replaced in 2016, the next in 2020, now it'll be another. Fortunately they are pretty cheap.
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2005 Connoisseur 2.5 auto SE Tourer in BRG with Sandstone Beige and Black piping interior (the 2nd of only 7 Rover 75s produced 5th November 2004, and it’s the 244th of 303 facelift British Racing Green 75 tourers built worldwide). All I've done is add Rover walnut gear knob and handbrake...

2016 Vauxhall Viva SL (Father Jack) "assisted manual" (auto) in purple. Going rusty underneath already...

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