As above what is the normal water temp range. I fitted a scan 2 gauge and reads between 97 and 104 deg C???
Is this normal?
I was expecting around 90 deg C?
Thanks

 

Sounds about OK mate my in car 52mm gauge reads constantly just under 100 deg around town, sits at 85-90deg on the motorway and back when we had the icy winter conditions around 80-90 and in summer climbs up to around 110-120deg on my 1.8 Zetec. They do have a tendency to run hot the Zetec engines though so don't worry. Mine is plumbed in line with the top rad hose so reading intake water temp from rad i.e. hottest part of the water system.

 

Motorway cruising during the summer at a constant 80mph will see 112-114C on scangauge.

 

Excellent lads, thanks for for putting my mind at ease. Left it running just there for a few mins after giving it a run and fan switched on a 110 deg C to cool it down so all is going well.
Any idea why my resistor pack keeps failing?
i'm after replacing it twice and it works for a couple of weeks and then packs up again????
The only difference is the original one was a blue plastic pack and the replacement ones i got from Ford were black plastic but i don't think this would make a difference???

 

Have you checked you blower motor?

The cover over the pollen filter is a poor design and relies on the double sided foam seal to prevent water running off the windscreen into the air intake. When it does the usual symptom is a wet footwell. However it can also get into the blower motor and cause corrosion making it stiff.

Still takes a lot of current but little airflow, so the thermal fuse on the resistor pack blows. That can be replaced with a near equivalent from Maplin for a few pence.

Martin

 

Don't forget that the Focus RS temperature is actually the cylinder head temperature and not the water temp

Temp readings sound normal though!

 

I have a zetec-s mk5 Fiesta with a Scangauge and similar temps,but like Will says its reading head temp and that will allways be hotter than water temp.

 

Actually guy's, the indication on the ScanGuage, or any other OBD reader isn't cylinderhead temperature.

Your quite right that the sensor on Focus is CHT but the PCM takes that into account and adjusts the reading to what it considers to be a coolant temperature for the OBD datastream.

Same confusion for owners of fully electronic instrument clusters (all Focus). The temperature display isn't a gauge as with older units that used a dedicated sensor in the thermostat housing. Its more a 3 zone indicator, cold-running temp-hot programmed into the processor in the cluster reading the same OBD datastream.

Martin

 

Considering the heat is transferred to the thermistor via engine coolant I think it is coolant temp!!
tabetha

 

Not on a Focus or late Mondeo Blacktop Zetec engine it isn't tabetha (except the ST170 engine).

The 'thermistor' sensor is a probe about 5cm long. Its screwed into a dry pocket from the inlet manifold face above cylinder #1. Hence CHT.

At operating temperature, CH temperature is 10-15 degrees higher than coolant temperature. Also if you measure the voltage across the thermistor, you have to allow for the EEC-V PCM changing the bias resistor as temperature reaches ~90 degrees (IIRC).

Martin

 

yep thts right, removed mine when fitting my new inlet manifold to my FRS, and was surprised to see it was a dry pocket,

my scangauge reads around 95-110 through most driving conditions in the warmer weather, fans kick in at 112 on the scangauge, the zetec is a "hot" running engine, just the way it was designed,

i also have a SPA water temperature / Oil pressure gauge, the water temperature is measured from a sensor installed in the thermostat housing so is measuring actual coolant temperature, it read approx 10 degrees lower than the scangauge

 

i have the same inlet as you will be fitted soon just wondered what diff it made apart from the usual plastic cracks etc did it drive any different ?
tim

 

what inlet manifold is that then mate?? ive got an all ally one from ford racing??

but i havent had a chance to drive with it on yet waiting on a few more bits to finish it all off,

 

Yes pal ford racing alloy 1
tim

 

ah you bought Bens one then

most of what ive done for fitment etc is on my thread on the RSOC
http://bbs.rsownersclub.co.uk/showthread.php?t=224282
if you need more detailed / in depth info PM me on the RSOC forum as i frequent there a lot more than here, happy to help you get it fitted mate,

im almost finished mine just waiting on a few parts then it will be off for mapping, so i will beable to let you know the difference, but im expecting it to be much better through the higher RPMs as its quite a nice design for a manifold nice big plenum and long runners , but at lower rpm im unsure as to how it will affect running,

also you will need an oil cooler as the water / oil cooler system from the Rs wont fit with the new manifold, im expecting a new kit for the RS from HEL to arrive this week, so fingers crossed i can get it installed and let you know how it fits etc, as im not 100% happy with the setup i put in place at the moment,

anyway any more infor you need PM me on the RSOC mate, i will try and help where i can,