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Old 26th February 2021, 14:56   #1
peelaaa
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Default coolant temp gauge slightly low

Hi,

my cdti has already had the inline thermostat added but just today I noticed that the temp gauge is not exactly at the 2100 position. Its not far off mind, about 2030.
Have the inline thermostats been known to fail?

thanks
Ian
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Old 26th February 2021, 15:33   #2
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Quote:
Originally Posted by peelaaa View Post
Hi,

my cdti has already had the inline thermostat added but just today I noticed that the temp gauge is not exactly at the 2100 position. Its not far off mind, about 2030.
Have the inline thermostats been known to fail?

thanks
Ian

Yes.
Use the IPK measurement to see what the actual temperature is
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Old 26th February 2021, 18:38   #3
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Quote:
Originally Posted by peelaaa View Post
- - - the temp gauge is not exactly at the 2100 position. Its not far off mind, about 2030.
The Trip Screen Diagnostic routine will tell you it's running at about 68-70°C, so the in-line stat appears to be leaking. What brand did you fit?


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Old 26th February 2021, 19:37   #4
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Originally Posted by T-Cut View Post
The Trip Screen Diagnostic routine will tell you it's running at about 68-70°C, so the in-line stat appears to be leaking. What brand did you fit?


TC
It was fitted before I bought car so I'll give it a check over the next few days.
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Old 26th February 2021, 21:44   #5
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Checked this evening, It was max 75c, averaging about 72c over a 30 mile drive

Last edited by peelaaa; 27th February 2021 at 12:47..
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Old 27th February 2021, 12:22   #6
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If the temperature has 'always' been there but you hadn't really noticed it before, then I reckon the in-line stat isn't the recommended type. It needs to be water-tight when closed otherwise the bleed-by will lmit what temperature the engine will attain. I'd suggest replacing it with one made by First Line, Gates or Mahler. These have been shown to perform best because there's little if any bleed-by.

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Old 27th February 2021, 12:45   #7
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Quote:
Originally Posted by T-Cut View Post
If the temperature has 'always' been there but you hadn't really noticed it before, then I reckon the in-line stat isn't the recommended type. It needs to be water-tight when closed otherwise the bleed-by will lmit what temperature the engine will attain. I'd suggest replacing it with one made by First Line, Gates or Mahler. These have been shown to perform best because there's little if any bleed-by.

TC
The gauge had always been steady at the 9pm mark until recently so it must be failing. Cant see any leaks anywhere either.

What thermostat should I be seeking, the renault 5 one?, or is there a generic code for them?
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Old 27th February 2021, 18:05   #8
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Yes it's the Renault 5 stat, branded with one of the names mentioned. I have no code or part number references. You'll almost certainly locate one on eBay.


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Old 28th February 2021, 13:06   #9
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I have the recommended in-line stat provided by DMGS and works fine. As you can see the IPK temp is showing 86c but the gauge is barely over the quarter mark. That to me says there is a fault in the gauge reading not the temp sender or stat performance.

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Old 28th February 2021, 22:10   #10
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Hi MacRob,
Have you tried running a 'Test 2.0' on your dash - to see if the cluster needles move properly?
If the needle moves correctly, the data stored in your IPK could be incorrect (there are7? temperature positions stored in the IPK to control where the needle points, and at which temperature).

Peelaaa, it definitely sounds like your inline stat needs replacing, as T-Cut has suggested.
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