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DCi 3.0 Initiale Overheating at speed

UserPost

09:28
April 29, 2012


hickettsa

Guest

1
0

Hi there,

Have been VS owner for 5 years, now 120,000 miles, all main dealer serviced last one in March, and have been very happy with the car.

 

A few weeks ago not long after last Renault service, the VS started to overheat at speed (above 70 on motorway!), temperature would drop on reducing speed and coolant was disappearing, AA and local specialist have done the gas emissions test re : head gasket which seemed positive.

They have by way of diagnosis:

  • replaced cracked expansion bottle
  • replaced thermostat
  • replaced water pump, and done timing belt etc at same time
  • replaced radiator

None of the above has solved the issue, at speed my beloved VS is still overheating and the heater is blowing cold air which seems to suggest coolant circulation issues or worse?.

The garage put the copper filing, type gunk into coolant system to validate the Head gasket was OK and the overheating is still there. 

Having spend a fair bit so far, I and my wallet are creaking, anyone had similar issue and / or got any ideas, I love the car so am keen to finish the work but running out of ideas.

Thanks in advance

Andy

12:46
April 29, 2012


R9UKE

Guest

2
0

Is the car holding it's coolant?

18:48
April 29, 2012


hickettsa

Guest

3
0

R9UKE said:

Is the car holding it's coolant?

Hi there R9UKE, thanks for your interest.

 

The coolant seems to be reducing, although there is coolant in there when the air out of the heater is blowing cold when set to hot.  The coolant seems to be coming out of the cap also when overheating.

 

Any thoughts?

19:44
April 29, 2012


R9UKE

Guest

4
0

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

17:09
May 2, 2012


hickettsa

Guest

5
0

R9UKE said:

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

R9UKE, thanks for this, it looks like having done the tests again! that the Head gasket is now the line of enquiry, hopefully not cracked cylinder head(s) as well. Fingers crossed. Will keep you informed.

17:12
May 11, 2012


hickettsa

Guest

6
0

hickettsa said:

R9UKE said:

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

R9UKE, thanks for this, it looks like having done the tests again! that the Head gasket is now the line of enquiry, hopefully not cracked cylinder head(s) as well. Fingers crossed. Will keep you informed.

Folks,

Heads off, head gasket look OK, some black shadow on one cylinder, awaiting Cylinder heads pressure test results.  EGR valve blocked, as alternate.  All strange, not sure what the best outcome is now.  Any ideas.

22:00
May 11, 2012


lexi

Guest

7
0

hickettsa said:

hickettsa said:

R9UKE said:

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

R9UKE, thanks for this, it looks like having done the tests again! that the Head gasket is now the line of enquiry, hopefully not cracked cylinder head(s) as well. Fingers crossed. Will keep you informed.

Folks,

 

 It's a shame that an engine that should be bulletproof on paper gives problems like this. 

   You can only wait for head tests. May even be block that is cracked?

I always replace the cap and T/stat together.  Keep us posted .

       

Heads off, head gasket look OK, some black shadow on one cylinder, awaiting Cylinder heads pressure test results.  EGR valve blocked, as alternate.  All strange, not sure what the best outcome is now.  Any ideas.

18:01
May 14, 2012


hickettsa

Guest

8
0

lexi said:

hickettsa said:

hickettsa said:

R9UKE said:

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

R9UKE, thanks for this, it looks like having done the tests again! that the Head gasket is now the line of enquiry, hopefully not cracked cylinder head(s) as well. Fingers crossed. Will keep you informed.

Folks,

 

 It's a shame that an engine that should be bulletproof on paper gives problems like this. 

   You can only wait for head tests. May even be block that is cracked?

I always replace the cap and T/stat together.  Keep us posted .

       

Heads off, head gasket look OK, some black shadow on one cylinder, awaiting Cylinder heads pressure test results.  EGR valve blocked, as alternate.  All strange, not sure what the best outcome is now.  Any ideaslexi said:

hickettsa said:

hickettsa said:

R9UKE said:

I would replace the coolant cap if it wasn't replaced when the expansion bottle was done – cheap part so it's worth a go!  Other than that, most overheating dV6s are diagnosed as having cracked cylinder heads – but this is something that would have affected the results of those head gasket tests.

R9UKE, thanks for this, it looks like having done the tests again! that the Head gasket is now the line of enquiry, hopefully not cracked cylinder head(s) as well. Fingers crossed. Will keep you informed.

Folks,

 

 It's a shame that an engine that should be bulletproof on paper gives problems like this. 

   You can only wait for head tests. May even be block that is cracked?

I always replace the cap and T/stat together.  Keep us posted .

       

Heads off, head gasket look OK, some black shadow on one cylinder, awaiting Cylinder heads pressure test results.  EGR valve blocked, as alternate.  All strange, not sure what the best outcome is now.  Any ideas.

Folks,

 

Completely stumped, no cracked heads after pressure tests.  Desperate News, probably now for breaking, scrap, any ideas?  Possibly thinking of a 2.2 dci VS now or maybe Avantine; is the 2.2 any more solid than the 3.0?

 

If anyone has any other ideas, let me know, FrownYell

19:40
May 14, 2012


R9UKE

Guest

9
0

Oh dear, sorry to hear that.  As for the 2.2 dCi question – absolutely not, it's by far most troublesome of the Vel Satis engines.  Running costs are an issue, but the 3.5 V6 seems to represent best reliability.

The Avantime is a great car, I have one and absolutely love it.  But do I prefer it to the Vel Satis?  No.  The driving experience, comfort and amount of gadgets are well behind.  However – reliability seems much better.

Just out of interest, how much would you want for the car as it is?  I'd love an overheating dV6 to conduct a few experiments on and monitor exactly what happens to cause it to overheat….

19:40
May 14, 2012


R9UKE

Guest

10
0

Oh dear, sorry to hear that.  As for the 2.2 dCi question – absolutely not, it's by far most troublesome of the Vel Satis engines.  Running costs are an issue, but the 3.5 V6 seems to represent best reliability.

The Avantime is a great car, I have one and absolutely love it.  But do I prefer it to the Vel Satis?  No.  The driving experience, comfort and amount of gadgets are well behind.  However – reliability seems much better.

Just out of interest, how much would you want for the car as it is?  I'd love an overheating dV6 to conduct a few experiments on and monitor exactly what happens to cause it to overheat….


 

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