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  Engine not getting up to normal temperature 20 Feb 2014 (Ask HJ)
  My 2007 Audi A5 3.0 TDI Quattro has started running cool. I have owned the car from new and up to last autumn (2013), the temperature gauge used to get...
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  How should I make sure my turbocharged engine cools properly when I switch it off? 5 Oct 2013 (Ask HJ)
  You often advise about cooling down turbos before switching off the engine. I have a TC petrol engine and during normal driving the oil temp rises to 94/95C....
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  Vauxhall Astra won't start - what's the faul? 4 Oct 2013 (Ask HJ)
  My 1998 Vauxhall Astra 1.6 petrol has started making strange engine noises yesterday. It sounds like an exhaust blow and rattle under 2000rpm, but cleared...
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  What's causing my Jeep Grand Cherokee to misfire? 24 Sep 2013 (Ask HJ)
  I have a dangerous misfire on 13 year old Jeep Grand Cherokee 4.0-litre petrol. When partly warmed up, it goes through a spell of chronic misfire on part...
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  Faulty sensors on Ford Focus - how can I fix it? 27 Aug 2013 (Ask HJ)
  I have a 2006 Ford Focus. A few months back the engine management light came on and my local garage said it was caused by the emissions sensor. However,...
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  What could be causing the radiator fan to switch on too often on my 2008 Jaguar S-Type? 6 Jul 2013 (Ask HJ)
  I have a 2008 Jaguar S-Type 2.7 diesel with 27,000 miles on the clock. Of late it seems to me that the radiator fan operates much too frequently, almost...
• 2.0 VVT-i T25 - White Smoke Avensis 17 Apr 2013 (Forum)
  for hours in traffic without any issues. The coolant level hasn’t dropped at all as I have marked this on the expansion tank and the colour is nice and blue. The oil was changed by my mechanic about 1000 miles ago and looked fine as is the replacement oil. Dipstick looks good, oil filler cap looks good. I
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  Vauxhall Vivaro 1.9 CDTi just won't rev... 12 Apr 2013 (Ask HJ)
  I have a 2003 Vauxhall Vivaro 1.9 CDTi van with 95,000 miles on the clock. It has been running fine but after having been parked up and not run for a few...
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  Old Audi won't start properly 18 Sep 2012 (Ask HJ)
  I have an M reg Audi A4 which has a problem starting and then just dying. I start it again and give it some throttle and rev it for a half a minute and...
• Ford Focus (1998 - 2004) - 00 1.6 Overheat Problem 19 Jul 2012 (Forum)
  extremely slowly. I am not mechanically minded (the oil filter change is the top of my abilities!) but have looked online and found suggestions that it could be blocked coolant or dodgy thermostat. Does anyone have an opinion on if it's something so simple or if this is indicative of impending engine blow
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  What does the warning light on my Fiesta mean? 21 May 2012 (Ask HJ)
  I have a 2002 Ford Fiesta 1.4 Tdci - I was driving along and all of a sudden I had power loss and a warning light on the instrument cluster, reading E.A.C...
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  Vauxhall Corsa won't start 23 Feb 2012 (Ask HJ)
  I have a Vauxhall Corsa SXI 1.3CDTI on a 57 plate that is not starting. It's been to Vauxhall who said there is low compression and the valves are damaged. I...
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  Should I sell my 2004 Mercedes-Benz E270 to avoid problems in the future? 28 Jan 2012 (Ask HJ)
  I purchased a Mercedes-Benz E270 CDI Elegance Estate on 1 September 2004. It has only done 55,000 miles, is in excellent condition and has been serviced...
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  Fiesta heating problem 7 Dec 2011 (Ask HJ)
  I've just got my car back from having an MOT and my heating has noticeably deteriorated, prior to the MOT it was working perfectly. On the heating...
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  Blame game 27 Apr 2011 (Ask HJ)
  Recently had new timing chain fitted to my 2001 Corsa, as recommended to me by diagnostic expert. Had car back and on 10th day it overheated as I attempted...
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  Can I take my warranty company to the small claims court? 11 Sep 2010 (Ask HJ)
  I have a claim on an extended warranty for a broken-down ECU, sensor and wiring harness which had to be replaced. The cause on the invoice was "Thermister...
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  Is it risky to buy a high mileage P-reg BMW 320i Cabriolet? 12 Aug 2010 (Ask HJ)
  I've seen a P-reg BMW 320i Cabriolet E36 with 237,000 miles, which looks alright and has a full BMW service history and MoT. The seller says it drives...
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  How do I use Radweld in my Peugeot HDI? 7 Aug 2010 (Ask HJ)
  I'm absolutely hopeless on these matters but I've got a leak somewhere in my radiator. I'm having to top up the coolant every few days. I bought some Radweld,...
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  Why is my Volkswagen Golf IV cutting out? 25 Jul 2010 (Ask HJ)
  My 2000 Volkswagen Golf IV 2.0-litre automatic runs fine from cold, but when it warms up it starts to misfire, then has no power and then cuts out. I have...
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  Automatic transition 13 Feb 2010 (Ask HJ)
  Our 2005 Astra 1.8 Auto has just become a near write-off. The auto gearchange stopped working and when we took it to two Vauxhall garages both said that...