shultsy12
Member
Registered: 27th Oct 06
Location: Hemel Hempstead, Hertfordshire
User status: Offline
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only just started doing this no previous problems fan is constantly on from when i start the car to when i turn it off any ideas? also the temperature is all over the place up and down!
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jimmy 2.1
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Registered: 17th Oct 05
Location: Shipley, West Yorkshire
User status: Offline
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The fan comes on as soon as you start the car up?
If so, sounds like the fan switch in the radiator is stuck on. New ones don't cost that much
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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Yeah sounds like a fan switch problem, theyre only about a tenner, fix that before you worry about your temp being all over the place
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shultsy12
Member
Registered: 27th Oct 06
Location: Hemel Hempstead, Hertfordshire
User status: Offline
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where do i get one from?
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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Vauxhall still sell them I think, probably best to try them first but they arent hard to get hold of from motor factors
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lil_g
Member
Registered: 29th Oct 06
User status: Offline
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Autovaux 
As said only about £10
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Ronnie27
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Registered: 9th Aug 08
Location: Longtown, Cumbria
User status: Offline
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could also be coolant temp sensor as the fan will run all times as the ecu dosent know temp of car and fan always runs as a fail safe to protect it
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luke85
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Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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Nope, ECU has no control over the cooling fan
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Ronnie27
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Registered: 9th Aug 08
Location: Longtown, Cumbria
User status: Offline
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i know that but the ecu reads the temp and tels fan when to kick in i know this cos im a mechanic and hav had this problem on a cavilier and on a calibra
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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The ECu reads the engine temperature and adjusts the fuel/timing accordingly. It does not tell the fan when to come in at least on a corsa, and im certain it doesnt on the cav/calibra.
Ive re wired many conversions and the ECU has absolutley no like to the fan
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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like=link
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Ant
Member
Registered: 12th May 02
Location: Hereford and Worcester
User status: Offline
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yep ecu has nothing to do with fan control it cant there is a physical switch screwed into the side of the radiator. CTS as will only adjust the fueling.
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