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Thread: Running too cold

  1. #1
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    Default Running too cold

    Got a 55-plate CDTI150 and lately it has been running to cold,the gauge never goes over 70 even if i'm sitting in traffic. I do a round trip of 60 miles a day for work and am still getting an average of 50 mpg. I thought I would start by changing the thermostat. My local dealer has told me it comes complete with the housing and gasket and have quoted me £43 odd for the parts. I am thinking of fitting it myself, was wondering if it is a tough job? Thanks in advance.

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    Regular Member P3tchy's Avatar
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    I've got the same problem with my 04 cdti, its getting changed on sat, and yes its a complete unit with temp switch, will also need a new gasket and its not a very big job.

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    Let me know how you get on with that.I'm gonna get the parts and fit them myself if it's not too much stripping down to get to it. Does anyone know if there's a How-2 for replacing the thermostat?

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    My mates doing it on saturday for me, I can't me bothered with spanners anymore... lol

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    Full Member Big Sig's Avatar
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    Don't forget the new coolant, you may as well change it at the same time.
    Now I need a turbo to keep up!

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    Coolant is a good tip, as you loose approx 2 liters of it during the replacement-process. Use the Red GM-genuine one to top up the system. -I do not think it can be mixed with others and it is a special one designed for the alloy/material inside the engine.

    You'll save more coolant if use a few of those special pliers that can be locked on to the tubes and prevent coolant getting out, but still you loose a great bit.

    Did mine a few days ago, pretty straightforward, although had some problems with air in the system afterwards for the heater inside the car. Got some good advice here in the forum, bleeding it out thru the bleed-screw and all is good.

    Takes you a couple of hours to replace the thermostat, a bit fiddly to get the new one in and connect the hoses, but no major things.

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    my cdti 150 is running at about 40 then when i put my foot down i can watch it creep up to 80 then thats it never any more? then when i slow down goes back down to 40 any ideas????

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    Quote Originally Posted by andy_hare View Post
    my cdti 150 is running at about 40 then when i put my foot down i can watch it creep up to 80 then thats it never any more? then when i slow down goes back down to 40 any ideas????
    Faulty (stuck) Thermostat........
    Mine was not stuck, but it was not closing fully either, so engine-temp did not go over 80 degrees. -This caused crappy MPG and also the additional-heater was running almost all the time.
    With new thermostat, temp is around 85 during normal driving and closer to 90 at idle/standstill in traffic.

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    whats that cost to get sorted?????

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    I'm getting the parts at vauxhall so I'll get some red coolant at the same time,probably in the new year now.I'll keep you posted.

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