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Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you.

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Old 25th November 2017, 19:00   #1
Jonathancilia
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Default Saxo operating temperature

Hi guys do you know if its normal that my saxo diesel hovers around 105 degrees celcius while driving? The overheating light never lit but i think its running abit hot to be honest. Coolant is full and bled, When cold it first goes to 60 degrees then stops for a bit then goes to 80 degrees than stops again and then goes to 95-105 degrees and pretty much stay there, fan starts at 110 degrees, i boight a new fan switch as it was faulty. It has markings in it 97-102 degrees but the fan starts at 110 degrees. What you guys think?

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Old 26th November 2017, 10:47   #2
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you don't get 60 degrees when cold. Temp sensor or gauge is faulty.
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Old 26th November 2017, 14:56   #3
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No i meant when i start it, i drive for like 10 minutes then rises to 60 degrees and so on till it reaches 100-105 degrees

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Old 26th November 2017, 18:21   #4
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Check that the fan comes on at an ACTUAL 102 degrees and off at an ACTUAL 97 and ignore the gauge.
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Old 26th November 2017, 18:55   #5
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It comes on at 110 degrees and stops at around 95 degrees

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Old 26th November 2017, 18:56   #6
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By the way the gauge is aftermarket, my car has the light only and i installed an adapter in the top radiator hose to read the temperature, maybe the temp in the radiator is lower ?

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Old 27th November 2017, 08:21   #7
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your gauge is crap --
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Old 27th November 2017, 10:11   #8
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How can you say that ?

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Old 27th November 2017, 16:48   #9
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because it's not displaying the actual temperature. Get a new genuine part for peace of mind, or leave as it is.
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Old 27th November 2017, 17:37   #10
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I tested the gauge before i installed it in boiling water it read correctly

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Old 27th November 2017, 18:09   #11
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Rather than anyone responding with "3/4" etc... What is the actual optimum running temp? in Celsius.. 85-95c?
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Old 27th November 2017, 18:22   #12
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Mine always hovers at 100-105 but she seems happy doesnt complain lol

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Old 27th November 2017, 18:42   #13
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Your fan switch will have a degree of calibration.

When your fan comes on the switch will be in the range it's rated for.

If it helps, the fan in my last 1.5d (Which I owned for 6 years and over 70,000 miles) NEVER came on. Even when it's hot summer.

My new 1.5d... well I've not had it long but the temp gauge never goes above half. however there's no scale on it.

I wouldn't be worrying about it, the 1.5D suffers badly from oil getting too hot. that'll kill it before hot coolant.


I think your gauge is over-reading a little bit.
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Old 27th November 2017, 18:45   #14
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Really ? But if driving it for long times only it gets the oil hot ? I never had problems till now, i used 10w40 fuchs semi shnthetic

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Old 28th November 2017, 05:44   #15
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Is there any manual fan switches that i can install to switch the fan on myself ?

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Old 28th November 2017, 09:18   #16
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85-90c is normal op temp of engine thats why fan kicks in at 95c
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Old 28th November 2017, 09:21   #17
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there is no engine in the world that runs at 100c or more--unless its a steam engine

mybe suggest new expansion tank cap to start with --
at the temps quoted the top hose would be pumped up hard --if not then tank cap is not holding pressure--which would allow water to boil in head
with 20psi water don,t boil till 130c
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Old 28th November 2017, 09:39   #18
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I will try new cap because its cheap anyway

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Old 28th November 2017, 09:40   #19
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Or maybe i will try another gauge, i have another one that i can use

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Old 28th November 2017, 15:30   #20
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This is the highest temp the gauge is rising to after lots of driving, its a dragon gauge bought from ebay

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