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        General >> Problems >> engine fans running all of the time
        
(Message started by: David_South_West on Apr 26^th, 2006, 8:39pm)

Title: engine fans running all of the time
Post by David_South_West on Apr 26^th, 2006, 8:39pm

the engine cooling fans on my 24v have started to run full all of the time ...changed engine temp sensor(the one with 2 wires)..well i plugged the new one in to the socket on wiring loom..no difference.Switching air con off makes no difference.i have checked big green relay and when engine not running and ignition is on the relays open and fans switch off.
any ideas anyone.
Another problem speed sensitive steering is light in the mornings when everything is cold but soon as car warms up becomes heavy even at parking speeds
Thanks
David

Title: Re: engine fans running all of the time
Post by sector-9 on Apr 26^th, 2006, 9:37pm

Unplug the air-con trinary switch - it's a three-pin connector in front of the 'radiator', near the LH headlamp. If that stops the fans then the fault is the switch or too much pressure in the air-con system (e.g overfilled).

Darren

Title: Re: engine fans running all of the time
Post by David_South_West on Apr 26^th, 2006, 10:02pm

thanks for suggestion Darren...just tried that ..fans still on !

Title: Re: engine fans running all of the time
Post by sector-9 on Apr 27^th, 2006, 12:06am

You're absolutely right meg, that's why I told him to disconnect the trinary switch as it is this which switches the fans on at full speed if pressure too high - it also shuts off the compressor, and if the pressure is too low (but doesn't run the fans).

Darren

Title: Re: engine fans running all of the time
Post by David_South_West on Apr 27^th, 2006, 12:29pm

Just checked air con clutch definately engaging..checked voltage at ect sensor white wire is showing 4.6 volts....should it be the brown wire showing voltage?
Thanks

Title: Re: engine fans running all of the time
Post by Octavian_P on Apr 27^th, 2006, 3:42pm

Hi there, can you measure the resitance, because that voltage doesn't sound good

at -40 degC 880 Kohm 4.53 V

http://www.fordscorpio.co.uk/sensors.htm

Title: Re: engine fans running all of the time
Post by WAYNE on Apr 29^th, 2006, 6:59pm

hi
try checking wires from engine coolant temp switch for breakages by removing black sheathing carefully,then trace back towards waterpump.this hapened on my 24v and turned out to be a broken wire (green) which made fans run constantly.hth
wayne