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Old 13th April 2019, 21:11   #21
RogerHeinz57
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Are you running a KV6 powered vehicle ?

If you are, here is something to check that only takes a moment -
Remove the cover that the oil filler cap sit over, take a look with a torch if possible, and take a look at the gaps between the alloy manifold pipework at the "V" area.
Is there a pool of coolant laying at the bottom ?
If yes, then either the thermostat or it's seal may have let go, and the mist from the boiling coolant may have sprayed over the engine temperature sensor causing the panic at the dash panel gauge and red warning light to display. This being the case, the cause of the puddle underside is because the "V" section of the engine has a small drain / port hole allowing fluids to drain out. The hole is behind where the water pump housing is and the flow will end up on the road just by the inside of the drivers side front wheel.
My ZT 190 has done this, the thermostat has sprung a leak at one of the connectors for a hose to fit on.
Not enjoying the repair, but taking my time and cleaning everything up to a good state prior to re-assembly.

Hope this may help you get to the bottom of your mystery !
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Old 13th April 2019, 22:22   #22
slovcan
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Quote:
Originally Posted by RogerHeinz57 View Post
Are you running a KV6 powered vehicle ?

If you are, here is something to check that only takes a moment -
Remove the cover that the oil filler cap sit over, take a look with a torch if possible, and take a look at the gaps between the alloy manifold pipework at the "V" area.
Is there a pool of coolant laying at the bottom ?
If yes, then either the thermostat or it's seal may have let go, and the mist from the boiling coolant may have sprayed over the engine temperature sensor causing the panic at the dash panel gauge and red warning light to display. This being the case, the cause of the puddle underside is because the "V" section of the engine has a small drain / port hole allowing fluids to drain out. The hole is behind where the water pump housing is and the flow will end up on the road just by the inside of the drivers side front wheel.
My ZT 190 has done this, the thermostat has sprung a leak at one of the connectors for a hose to fit on.
Not enjoying the repair, but taking my time and cleaning everything up to a good state prior to re-assembly.

Hope this may help you get to the bottom of your mystery !
I just checked his profile. It's a 1.8T.
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Old 14th April 2019, 08:25   #23
SD1too
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Quote:
Originally Posted by fontaine666 View Post
scrap time then, shame.
John,

Have you checked that your radiator cooling fan is working?
  1. Start the engine from cold.
  2. On the air con/heater control panel press the windscreen demist button.
  3. Get out of the car and walk to the front of the bonnet. Peer in through the radiator grille.
  4. Can you see and hear the electric fan running continuously (not pulsing on and off)?

Please report back and put out of your head any thoughts of scrapping your Rover 75. We are here to help you fix it when your garage can't.

Simon
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Old 14th April 2019, 08:51   #24
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Quote:
Originally Posted by SD1too View Post
John,

Have you checked that your radiator cooling fan is working?
  1. Start the engine from cold.
  2. On the air con/heater control panel press the windscreen demist button.
  3. Get out of the car and walk to the front of the bonnet. Peer in through the radiator grille.
  4. Can you see and hear the electric fan running continuously (not pulsing on and off)?

Please report back and put out of your head any thoughts of scrapping your Rover 75. We are here to help you fix it when your garage can't.

Simon
Hi Simon, thank you for that, obviously the last thing I want to do is scrap the car, but if the cost is going to outweigh the price I paid for the car then thats the only viable option.

The issue I have is that I had to abandon the car 5 miles from where I live, so checking things is a no go. However, the fan has been working for sure, it's even on in a video I made of the coolant leaking out of the car, which hopefully you can see here...

https://www.youtube.com/watch?v=2vUK-2tlUIo

The fan certainly seemed to be working fine up until these issues and would kick in when the car was stopped, and like you say when the heater was on without pressing the 'auto' button, or whatever button it is called, I forget.
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Old 14th April 2019, 08:57   #25
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Quote:
Originally Posted by fontaine666 View Post
Hi Simon, thank you for that, obviously the last thing I want to do is scrap the car, but if the cost is going to outweigh the price I paid for the car then thats the only viable option.



The issue I have is that I had to abandon the car 5 miles from where I live, so checking things is a no go. However, the fan has been working for sure, it's even on in a video I made of the coolant leaking out of the car, which hopefully you can see here...



https://www.youtube.com/watch?v=2vUK-2tlUIo



The fan certainly seemed to be working fine up until these issues and would kick in when the car was stopped, and like you say when the heater was on without pressing the 'auto' button, or whatever button it is called, I forget.


A leak that bad and the garage can’t find it🤨


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Old 14th April 2019, 09:11   #26
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A leak that bad and the garage can’t find it🤨


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Mental eh...
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Old 14th April 2019, 11:12   #27
SD1too
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Hi John,

Thanks for your reply. First a bit of philosophy ..
Quote:
Originally Posted by fontaine666 View Post
... but if the cost is going to outweigh the price I paid for the car then thats the only viable option.
Many people say that but it makes no sense to me. What has the purchase price got to do with anything? What is relevant is can you repair it for a reasonable price which still leaves you with a high quality car which you enjoy driving and are proud to own. Bear in mind what you would have to pay to replace it with something comparable.
Quote:
... the fan has been working for sure, it's even on in a video I made of the coolant leaking out of the car ...
I've seen the video and heard the fan. However that could be the fast speed and doesn't prove that the slow speed is working. By the time the fast speed triggers at 112 degrees C, you're fighting a losing battle.
Once you've got the car towed or recovered back to your house I would still recommend that you check the slow speed by doing the demist test. You'll kick yourself if you find that all it is is a failed resistor.

I agree with Zedhed. Forget that garage. Fill up the coolant, jack up the front of the car, remove the engine undershield, start the engine and use the most powerful tool you possess: observation. You must be able to trace a coolant leak of the kind shown in your video.

Simon
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Old 14th April 2019, 11:25   #28
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Originally Posted by SD1too View Post
Hi John,

Thanks for your reply. First a bit of philosophy ..

Many people say that but it makes no sense to me. What has the purchase price got to do with anything? What is relevant is can you repair it for a reasonable price which still leaves you with a high quality car which you enjoy driving and are proud to own. Bear in mind what you would have to pay to replace it with something comparable.

I've seen the video and heard the fan. However that could be the fast speed and doesn't prove that the slow speed is working. By the time the fast speed triggers at 112 degrees C, you're fighting a losing battle.
Once you've got the car towed or recovered back to your house I would still recommend that you check the slow speed by doing the demist test. You'll kick yourself if you find that all it is is a failed resistor.

I agree with Zedhed. Forget that garage. Fill up the coolant, jack up the front of the car, remove the engine undershield, start the engine and use the most powerful tool you possess: observation. You must be able to trace a coolant leak of the kind shown in your video.

Simon
Would a faulty resistor cause that coolant leak though?
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Old 14th April 2019, 11:47   #29
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Quote:
Originally Posted by SD1too View Post
Hi John,

Thanks for your reply. First a bit of philosophy ..

Many people say that but it makes no sense to me. What has the purchase price got to do with anything? What is relevant is can you repair it for a reasonable price which still leaves you with a high quality car which you enjoy driving and are proud to own. Bear in mind what you would have to pay to replace it with something comparable.

I've seen the video and heard the fan. However that could be the fast speed and doesn't prove that the slow speed is working. By the time the fast speed triggers at 112 degrees C, you're fighting a losing battle.
Once you've got the car towed or recovered back to your house I would still recommend that you check the slow speed by doing the demist test. You'll kick yourself if you find that all it is is a failed resistor.

I agree with Zedhed. Forget that garage. Fill up the coolant, jack up the front of the car, remove the engine undershield, start the engine and use the most powerful tool you possess: observation. You must be able to trace a coolant leak of the kind shown in your video.

Simon
Forgot to ask, can I just fill the coolant with water for now, or does it need the antifreeze too? Thanks
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Old 14th April 2019, 16:14   #30
SD1too
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Quote:
Originally Posted by fontaine666 View Post
Would a faulty resistor cause that coolant leak though?
My thought process was that if the resistor is open circuit causing loss of the slow speed, the temperature would rise to 112 degrees C before the fast speed was triggered. If, for whatever reason, the fan is unable to lower the temperature then the pressure relief valve in the expansion tank cap might open and expel a large amount of coolant.

The test is easy and quick and will answer your question.

Quote:
Originally Posted by fontaine666 View Post
Forgot to ask, can I just fill the coolant with water for now, or does it need the antifreeze too? Thanks
Recently a member's car was filled with a very low concentration of antifreeze on the understanding that some work would soon be carried out requiring draining. The best laid plans are susceptible to change and that's what happened. Unfortunately time passed and the overnight temperature dropped below freezing. I think you can guess the rest.
So the answer to your question is: how self-disciplined are you?

Simon
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