PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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Just got back from a little drive along the M6, and needless to say, I'm a bit puzzled by some symptoms from the car...
Driving along at 70mph (around 3200rpm) the temp gauge has begun to go from 90 to 95, then back down again... Increase to 85-90 and it reaches 100 before it comes back down, but this is only when coasting along (not flooring it).
Stick below 3000rpm (about 60mph/2800rpm) the gauge just sits bang on 90, no problems...
If I'm doing 70 and the gauge starts to increase, floor it and it then goes down... Accelerate slowly but steadily, it increases again to the 100 mark before coming down. Also if driving the car very hard, it will go no higher than about 92 at best.
I did pull over in the services to have a quick check on fluid levels & such. The coolant was still on the mark, and there was also no excessive pressure buildup which sometimes indicates HG failure. The coolant hoses and rad were also quite cool, as they are during normal running. Puzzling! Oil level was also fine and no no signs of mayo on the cap or anything. Plus the coolant was still a nice blue color with no discoloration.
Before people say CTS & temp sensor for the dash, they were replaced during the rebuild around 2000 miles ago now. As was the waterpump. The only thing I didn't replace was the thermostat, but the symptoms its got to me don't indicate a thermostat failure or fcuk up...
Any ideas??
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ChrisBoom
Member
Registered: 6th Dec 06
Location: Highland
User status: Offline
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Engine?
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antone_86
Member
Registered: 28th Mar 07
User status: Offline
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This may sound dumb but what is your airflow into the radiator like? Is there anything that is obstructing it e.g. after market body kit/spoiler?
Any photos if thats the case?
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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radiator was replace with a new one during the build, and its just standard gsi bodywork.
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antone_86
Member
Registered: 28th Mar 07
User status: Offline
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Tricky one... let me think on it... :S
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ChrisBoom
Member
Registered: 6th Dec 06
Location: Highland
User status: Offline
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quote:
Originally posted by PaulW
radiator was replace with a new one during the build, and its just standard gsi bodywork.
Guessing by this that its a C16XE?
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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C16.. X16.. basically the same
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ChrisBoom
Member
Registered: 6th Dec 06
Location: Highland
User status: Offline
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quote:
Originally posted by PaulW
C16.. X16.. basically the same
Yup. Try checking the wires around the temperatue sensor, i know on 1.2 8vs (Much different I know, but may be of help) that the wire off the sensor can come loose, touch metal and cause the temperature readings to be all over the place.
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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already been checked, also checked over the earths.
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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do you have the old dash temp sender Paul?
the new one might be faulty remember
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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yeah its still in the garage... I'll whack it in tomorrow see if it makes any difference.
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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i had 3 new faulty temp senders, i ended up putting the original back in,
or it could be a airlock?
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Rob_Lee
Banned
Registered: 9th Dec 05
Location: Folkestone Drives: Nova 1.6 16v
User status: Offline
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i'd say its an airlock.
When i first did the conversion in the nova it used to read really irratic on the gauge.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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airlock, sensor, water pump or wiring fault
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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gona replace the thermostat along with both sensors later.
waterpump was new aswell
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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Update...
Changed the Sender - no change
Bled the system through - no change
Changed Thermostat - no change
Changed sensor AND CTS aswell - no change
REMOVED THERMOSTAT COMPLETELY - no change
Disconnected the wire FROM the sensor itself...
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quote:
Originally posted by broster
airlock, sensor, water pump or wiring fault
You win first prize mark 
Solution...
http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=P/EOT-150BU-B
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