Focus coolant temp sensor--Where is it??????

JamesH · 13-05-2008, 05:50 PM

On a W reg 2000 1.6 Zetec black top

Where is the coolant temp sensor guys? Its the same thermostat housing as the silvertop but without the top tapped for the coolant temp sensor, so where is it? Is it inside the housing?

If you want to replace it do you have to replace the whole housing? And if so where are the wires/how are they located?

The fans are NEVER cutting in and temp gauge won't EVER go higher than exactly halfway so I think its this

Cheers

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RichieST · 13-05-2008, 07:44 PM

pretty sure its between 2nd and 3rd plug, or this could be the case with the 1.8/2.0.

Does it have a/c? If so, put that on and the fans should cut in, at least you know they work. My focus 1.6 gauge never ever budged from half way either, and the fan would only cut in on the hottest of days being sat in traffic. Dont worry about it unless the gauge creeps past half way.

sebspring · 13-05-2008, 07:52 PM

as he says. it si measured on teh back of the head or something like this.

put the a/c switch on or put the direction fan to windscreen with fans on and that switches it on as well

RichieST · 13-05-2008, 08:01 PM

Quote:

Originally Posted by sebspring

put the direction fan to windscreen with fans on and that switches it on as well

only the post-facelift focus's will do this

JamesH · 13-05-2008, 09:04 PM

Quote:

Originally Posted by jungleistmassiv

pretty sure its between 2nd and 3rd plug, or this could be the case with the 1.8/2.0.

Does it have a/c? If so, put that on and the fans should cut in, at least you know they work. My focus 1.6 gauge never ever budged from half way either, and the fan would only cut in on the hottest of days being sat in traffic. Dont worry about it unless the gauge creeps past half way.

Well it was boiling over and the gauge still only read halfway which has led me to this conclusion!

Its a very early (W) Focus, 1.6; so is it on the back of the head then?

cjwood555 · 13-05-2008, 11:18 PM

yeah as above it's a Cylinder Head Temperature Sensor rather than coolant temp sensor....
the guage is driven over the CAN bus / SCP link and only is programmed to stay in the middle once up to temperature unless the temp varies dangerously. This was apparently because there was a large number of complaints of 'high running temperatures' in foci, despite the lack of a scale on the guage!

Ok so that probably doesn't help, but a failed CHT would probably result in rough running when cold. Have you checked fuses and relays? Also worth testing the fan itself directly off the battery....

Chris

RichieST · 15-05-2008, 04:07 PM

I'd firstly get the thermostat and expansion tank cap changed. Does it boil over all the time, or just when its sat idling?

JamesH · 15-05-2008, 04:23 PM

Just when idling, as obviously when moving there is air going through the rad

I think stat is fine as once warm I felt the pipe and water was going through

Zetecfiesta · 05-06-2008, 12:08 PM

did anybody find the location of the coolent head temp sensor as im looking for it now and cant find it!

cjwood555 · 05-06-2008, 06:55 PM

as above, it's a head temperature sensor, not a coolant temp sensor - it's between spark plugs 2 and 3....

mark.evs · 26-10-2009, 02:57 PM

first i'd like to say hi as im new to your site, looks great and will probily be on here a bit.

I'm searching for this invisable sensor too, Its for an 1800 black top zetec 1998. its not between plugs 2 and 3 in the cam cover and not in the stat housing. it's been on diagnostic maching and it found a fault with the 'engine management cooling temp switch'. any ideas? it's not under the cam cover is it? many thanks.

Csm · 26-10-2009, 03:16 PM

Under the cam cover matey

mark.evs · 26-10-2009, 03:19 PM

cheers, the haynes book showed it being in the cover. it's been driving me nuts for weeks. Thanks again.

mark.evs · 27-10-2009, 10:45 AM

it's not under the cover either. any other ideas?

richard21172 · 17-02-2012, 02:59 PM

did the original problem get fixed ? i have the same issue on a Y reg focus

JamesH · 17-02-2012, 05:47 PM

As far as I know, changing the thermostat fixed the problem!

13-05-2008, 07:44 PM	#2
RichieST 10K+ Poster!! Garage is empty, add now Trader Score: (2) Join Date: Aug 2004 Location: Wiltshire Posts: 14,577 Rep Power: 23	pretty sure its between 2nd and 3rd plug, or this could be the case with the 1.8/2.0. Does it have a/c? If so, put that on and the fans should cut in, at least you know they work. My focus 1.6 gauge never ever budged from half way either, and the fan would only cut in on the hottest of days being sat in traffic. Dont worry about it unless the gauge creeps past half way. __________________

15-05-2008, 04:07 PM	#7
RichieST 10K+ Poster!! Garage is empty, add now Trader Score: (2) Join Date: Aug 2004 Location: Wiltshire Posts: 14,577 Rep Power: 23	I'd firstly get the thermostat and expansion tank cap changed. Does it boil over all the time, or just when its sat idling? __________________

15-05-2008, 04:23 PM	#8
JamesH 10K+ Poster!! Garage is empty, add now Trader Score: (21) Join Date: Jul 2003 Location: Sussex Posts: 10,268 Rep Power: 20	Just when idling, as obviously when moving there is air going through the rad I think stat is fine as once warm I felt the pipe and water was going through __________________ Breaking my BIG spec Saff - LOTS of top parts for sale--click me!

17-02-2012, 05:47 PM	#16
JamesH 10K+ Poster!! Garage is empty, add now Trader Score: (21) Join Date: Jul 2003 Location: Sussex Posts: 10,268 Rep Power: 20	As far as I know, changing the thermostat fixed the problem! __________________ Breaking my BIG spec Saff - LOTS of top parts for sale--click me!

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13-05-2008, 07:52 PM	#3
sebspring Winker Garage is empty, add now Trader Score: (3) Join Date: Oct 2007 Location: London Posts: 1,125 Rep Power: 7	as he says. it si measured on teh back of the head or something like this. put the a/c switch on or put the direction fan to windscreen with fans on and that switches it on as well

13-05-2008, 11:18 PM	#6
cjwood555 Advanced PassionFord User Garage is empty, add now Trader Score: (0) Join Date: Feb 2005 Location: Solihull Posts: 2,064 Rep Power: 11	yeah as above it's a Cylinder Head Temperature Sensor rather than coolant temp sensor.... the guage is driven over the CAN bus / SCP link and only is programmed to stay in the middle once up to temperature unless the temp varies dangerously. This was apparently because there was a large number of complaints of 'high running temperatures' in foci, despite the lack of a scale on the guage! Ok so that probably doesn't help, but a failed CHT would probably result in rough running when cold. Have you checked fuses and relays? Also worth testing the fan itself directly off the battery.... Chris

05-06-2008, 12:08 PM	#9
Zetecfiesta PassionFord Post Whore!! Garage is empty, add now Trader Score: (0) Join Date: Jan 2005 Location: Westhoughton Bolton Posts: 4,091 Rep Power: 13	did anybody find the location of the coolent head temp sensor as im looking for it now and cant find it!

05-06-2008, 06:55 PM	#10
cjwood555 Advanced PassionFord User Garage is empty, add now Trader Score: (0) Join Date: Feb 2005 Location: Solihull Posts: 2,064 Rep Power: 11	as above, it's a head temperature sensor, not a coolant temp sensor - it's between spark plugs 2 and 3....

26-10-2009, 02:57 PM	#11
mark.evs newbie Garage is empty, add now Trader Score: (0) Join Date: Oct 2009 Location: Bridgend Posts: 5 Rep Power: 0	first i'd like to say hi as im new to your site, looks great and will probily be on here a bit. I'm searching for this invisable sensor too, Its for an 1800 black top zetec 1998. its not between plugs 2 and 3 in the cam cover and not in the stat housing. it's been on diagnostic maching and it found a fault with the 'engine management cooling temp switch'. any ideas? it's not under the cam cover is it? many thanks.

26-10-2009, 03:16 PM	#12
Csm PassionFord Post Whore!! Garage is empty, add now Trader Score: (0) Join Date: Sep 2005 Location: Bonnie Scotland Posts: 5,686 Rep Power: 13	Under the cam cover matey

26-10-2009, 03:19 PM	#13
mark.evs newbie Garage is empty, add now Trader Score: (0) Join Date: Oct 2009 Location: Bridgend Posts: 5 Rep Power: 0	cheers, the haynes book showed it being in the cover. it's been driving me nuts for weeks. Thanks again.

27-10-2009, 10:45 AM	#14
mark.evs newbie Garage is empty, add now Trader Score: (0) Join Date: Oct 2009 Location: Bridgend Posts: 5 Rep Power: 0	it's not under the cover either. any other ideas?

17-02-2012, 02:59 PM	#15
richard21172 Virgin Garage is empty, add now Trader Score: (0) Join Date: Feb 2012 Location: Devon Posts: 1 Rep Power: 0	did the original problem get fixed ? i have the same issue on a Y reg focus

17-02-2012, 05:47 PM
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