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        General >> Problems >> still no fast fan
        
(Message started by: david49uk on Sep 8^th, 2009, 10:22pm)

Title: still no fast fan
Post by david49uk on Sep 8^th, 2009, 10:22pm

Hi have changed the ect i have fitted a new relay but still no fast fans on my cossie, they did used to come on a few weeks ago but now they dont ok while im going forward but as soon as i stop the temp starts climing, fans are coming on but slow speed only can anybody give me something else to try, dave.

Title: Re: still no fast fan
Post by Highlander on Sep 8^th, 2009, 10:47pm

Hi Dave,

Can you drive as long as you like and it doesnt overheat? only when stationary?

what are your fans doing?

do you have both fans running slow?

do the fans run slow/fast/not at all with the Aircon on?

checked the fuses? (symptoms dont suggest the fuses but have a look)

Fuses

• Fuse no. 37 controls the energizing and de-energizing of the relay. If it burns out, both fans will always be off, since the PCM will have no way of turning them on, neither on low speed nor on high speed.

• Fuse no. 39 controls both fans on low speed and the first fan on high speed. If it burns out, none of the fans will work on low speed, and only the second fan will work on high speed.

• Fuse no. 44 controls the second fan on high speed. If it burns out, both fans will work on low speed, but only the first fan will work on high speed.

All three fuses are located in the auxiliary fuse box, next to the battery.

Title: Re: still no fast fan
Post by david49uk on Sep 8^th, 2009, 11:07pm

hi stuart thanks for the quick reply i can drive allday long but as soon as i stop temp starts climbing regardless of weather, the fans do come on but only slow speed both fans the same speed when aircon is on. a few weeks ago you could definalty hear the fans when they came on the same as my focus and my soninlaws modeo.dave

Title: Re: still no fast fan
Post by Highlander on Sep 8^th, 2009, 11:13pm

OBD scan would be the easiest way to find whats wrong, can you get one done?

Title: Re: still no fast fan
Post by david49uk on Sep 8^th, 2009, 11:19pm

ive got one of alex leads but the only softwere that will run is a realy old version which i cant find anything to check the fans,dave

Title: Re: still no fast fan
Post by Highlander on Sep 8^th, 2009, 11:22pm

With an OBD lead you can see what the PCM is currently ordering the fans to do. On the Enhanced page there are two PIDs: LFC (low speed fan command) and HFC (high speed fan command). If LFC is ON, the fans should be running on low speed. If HFC is ON, the fans should be running on high speed.

Title: Re: still no fast fan
Post by david49uk on Sep 8^th, 2009, 11:52pm

cheers for that will do a scan tomorrow let u know what they are doing, dave

Title: Re: still no fast fan
Post by david49uk on Sep 10^th, 2009, 9:59pm

put the softwere on car tonight went to enhanced page can see the two fans do they high light when they come on or can u switch them on with the softwere your self, dave

Title: Re: still no fast fan
Post by Highlander on Sep 11^th, 2009, 11:49am

If LFC is ON, the fans should be running on low speed. If HFC is ON, the fans should be running on high speed

It should show you if either of the above states is currently active, you cant activate them as far as I'm aware.

What you are looking for is HFC showing ON showing the PCM is telling them to run fast but the fans NOT running fast, that would indicate a wiring/connection problem

Title: Re: still no fast fan
Post by scorpio_man on Sep 11^th, 2009, 11:59am

hi there

iirc, and i'm really not sure on this, but you can 'test' them using VE.

it might be lead dependant, but go in to TEST tab, then enhanced.

you should see the controls for the fans there.

hopefully it'll work. ;) :-/

Title: Re: still no fast fan
Post by david49uk on Sep 12^th, 2009, 12:15am

tried the scan again cant seem to get any joy temp rises over half nothing comes up in the enhanced page. ect is reading 217 degrees, thats all i can find out can you tell me what im suposed to do on that page or what is suposed to happen, dave

Title: Re: still no fast fan
Post by PJDavis on Sep 12^th, 2009, 7:35am

I realise that your car is a Cossie, I have a 2.3, and when the switch (one of two) that lives attached to the thermostat housing, is disconnected, the both fans default to high speed. The connector has a small wire clip that keeps it in place rather than just a push fit. The other switch on the housing is for the temperature gauge. This may tell you at least if the fans are actually working on high speed, and if they do, then you'll know it's a wiring fault or sender fault. Of course, this only if the system is similar to mine. Maybe I'm just blethering! :-X

Title: Re: still no fast fan
Post by scorpio_man on Sep 12^th, 2009, 9:12am

hi there

i've put how they should work on my multiply site....

http://images.scorpioman19.multiply.multiplycontent.com/attachment/0/Si-0sQoKCBoAAFp@YUk1/COOLANT%20FAN%20OPERATION%20v2.pdf?nmid=253465415

hth

Title: Re: still no fast fan
Post by david49uk on Sep 14^th, 2009, 11:58pm

still no fast fans is there any way i can test the wiring from the relay back, dave