Paul_RS

iTrader: (4)

Finally got my car going, but i'm having a problem with the fans switching on. They work fine witht he over ride switch, but the fan switch in the rad isn't bringing them on

Has anyone else had issue with using the uprated switch in a standard rad?

Moonstone Steve.

iTrader: (2)

Cossie4i has had problems m8, all on hear somewhere.

Steve

JamesH

iTrader: (21)

Mine was fine mate, but Cossie4i had 3 all didn't work in his car. Same symptoms as you. Wonder if yours is from the same batch? Stu should be able to tell you. Don't think they've tested Steve's ones yet...

Paul_RS

iTrader: (4)

I can't even remember when i bought mine

Its at least 6 months ago, if not longer!

Cilly-jey

my car dose the same, tryed 2 new ones in the rad, just use me over ride switch if temp gets 2 high. my over ride was not from msd thow.

dazzle740

iTrader: (1)

sorry if i'm wrong but was the idea of the uprated rad fan switch for owners using alloy rad not standard rads?

tabetha

Although said to be for alloy rads, it was the hysteresis(span) that was the improvement so better for std rads as well, the std rad fan switch was trying to get the temp below what the stat was trying to raise it to in some cases.
I was sent a msd one, that worked fine, purchaser just wanted to know actual span, ie on off temps of the switch, was switching fine.
tabetha

cossie4i+

iTrader: (15)

I still have not heard back from MSD about my switches.

Im pleased in a way that yours don't work either lol, maybe its not my Rad after all but then maybe your Rad is also blocked. (My car has never overheated)

Steve

marc_gti

iTrader: (2)

......

Cossy Mike

iTrader: (4)

I fitted one in my mates cossy for him and the fans would'nt kick in until around 90oC

Put my old one in and it worked fine.

There are 2 different types 82oC and the 88oC

I believe the uprated ones are nearer the 90oC

Buy a Ford one!

Paul_RS

iTrader: (4)

Ordered a genuine Ford one, so hopefully that'll get it going.


I flushed my rad a few days before fitting the switch so its 100% not it

martysmartie

iTrader: (1)

That temp you mention the 90 degrees would be correct, the "Uprated" switch does not close to around that temp and has just a few degrees span and so the fans operate for a short cycle, the trouble with the standard switch is that it brings the fans on to early and for far to long due to it's huge span (This is what causes the OE fuses etc to melt) If you have an alloy rad it suffers further from a heatsink effect and then the fans don't switch off. The standard span is some 11 degrees 88 degrees close and 77 degrees open which as said causes fighting with the stat as well.

Martin

cossie4i+

iTrader: (15)

This is the reason i wanted one.

Steve

Cossy Mike

iTrader: (4)

I have a Alloy rad on mine with genuine Ford fan switch and had no problems so far.

The fans are only on for around 1 minute and it stays cool unless it's standing or booted again.

I put the uprated one in mine and the fans would'nt kick in until the temp gauge was nearly touching the Red

I binned it

R5FORD

iTrader: (1)

my fans come on at 92 and go of at 88 not sure what switch etc

JamesH

iTrader: (21)

Not a good review on these then...mine had been fine though. Fans kicked in at 94°C with it fitted...

Hoogi

I'm coming to the end of my MKII Escort Cosworth build.

I've a Pro-Alloy Rad with an MSD Switch as mentioned.........guessing it's just a fingers crossed situation for me.

Just one question, is it a good idea to run a 82degree Thermostat to help matters ?

Burton do a Ford Unit (Part No. 1668305) but they're nearly Ł60

This is my first Cosworth Engine so all a little new to me.

cossie4i+

iTrader: (15)

Did you inform MSD about the fan switch not working ?

Im suprised they have not made a comment on the post

Steve

Gav Diamond

iTrader: (6)

The MSD one i had just ran the fans from the second i plugged it in...

NEIL A

iTrader: (6)

I was thinking of getting one of these but going by the feed back think I will hold off.

Moonstone Steve.

iTrader: (2)

The trouble is if people dont let msd know about these problems they cant resolve it, Stu did say on Steve's(cossie4i) post he had a couple if any problems, clearly there are more than that.

My switch works fine by the way

Steve

Paul_RS

iTrader: (4)

Out of interest i'm going to test mine properly, i've a thermocouple i use for work, so i'm going to heat the fan switch up and see when it opens.

I haven't report mine to MSD as i bought it ages ago and its not super expensive. Point of my post was just to see if many others had had this problem and to find out what switch is reliable.

RWD_cossie_wil

iTrader: (9)

Can you post a pic of the switch please? I have a similar problem with my small turbo escort. I'm NOT running an MSD switch, but a new one with a green casing, when the old one was red. In both instances, the fans won't come on with just radiator heat, even though the temp guage is near the red. The fans WILL work if you bridge the switch, which proves all the relays/wiring, or if you use the aircon switch to bring them in.

Rsmat

iTrader: (2)

Dont get ya knickers in a twist im sure Stu will be along soon.

Paul_RS

iTrader: (4)

Same fault as me, this is a link to the MSD switch

http://cgi.ebay.co.uk/UPRATED-Ford-S...item41558bc2f8


However mine has a white plastic surround on it, so maybe that green one is a revision over my type?

Gav Diamond

iTrader: (6)

Mine was Green one the one i took off the car was Red and worked fine on the standard rad but took forever to switch off on the Pro-Alloy rad, the car was took off the road not long after so never solved the problem

RWD_cossie_wil

iTrader: (9)

Thing is, I replaced my red switch due to the fans not coming in, so I'm wondering now if the switch I replaced it with is just no good/ wrong for the car? Are small turbo fan switches the same as the Webber managed cars?

I'm running std radiator, which is getting hot enough to burn your hand on, so should kick the fans in.

Might try another switch in the car tomorrow .. As said, I didn't get mine from MSD, but a different supplier.

Anyone know where to get a std switch from?

Paul_RS

iTrader: (4)

Small turbo switches are different as are BT escorts and late model sapphires. You have 4 contacts in your switch as the escorts had dual stage fans, one on then the second at a certain temp. The sierras just have either both on or both off fans, so only have two contacts. Both electrical connects are completely different too.

Ford still do the switches i think?

cossie4i+

iTrader: (15)

If people don't tell MSD the switch don't work they will never know they have a problem with the product.

teve

JamesH

iTrader: (21)

If my switch didn't work I'd be wanting my money back, not just saying "it's only Ł15" or whatever! I bet if you bought an item off a member on here for Ł15 that didn't work, you'd want your Ł15 back

Paul_RS

iTrader: (4)

Its just because i bought it soo long ago, i'll have to dig out the reciept tonight for a look.

JamesH

iTrader: (21)

I'm sure MSD have it on record mate, and seeing as there seems to be quite a few problems now I'm sure Stu will sort you out

Gav Diamond

iTrader: (6)

I did tell MSD about the problem and Stu said to return it and he would exchange it but as the car was off the road it was a low priority and got forgotten about till i saw this post.

cossie4i+

iTrader: (15)

Have you tested it yet ?

Yours done the same as one of the ones i was sent.

Steve

Cossy Mike

iTrader: (4)

Ford still do the switches

Both of mine come in and if the ignition is switched off one of the fans stops but the other continue's until cooled.

BRAMMER

iTrader: (23)

But wasn't the switch designed to come on for a shorter cycle? This would then mean your switches actually work its your not giving it chance to kick in at the higher temp.

cossie4i+

iTrader: (15)

I let the temp get upto 102c on one of the switches i was sent and the fans never came on. Paul also has the same problem.

Steve

martysmartie

iTrader: (1)

The Sierra fan setup is a just the same as other other model of the era, the switch like many of the other components was pulled from the parts bin. The Escos has a two speed fan setup and the switches are different and they also have four connections.

Easiest thing to do in your case as a test is to bridge the fan plug connector, this should start the fans, if it dosen't then it's NOT a switch problem, to be honest the switches rarely give trouble.

It's perfectly normal if you touch the radiator to get burnt.

To be honest I think the MSD "Uprated" switch is from another particular Ford
Martin

CossieRich

iTrader: (1)

What temp should the fans kick in at and switch off at using the msd switch? I have one on mine and will test to see how well it performs. I just fitted mine and then forgot about it lol. As long as my fans come on before the dsh gauge gets too high and then turn off again, i'm happy

martysmartie

iTrader: (1)

Circa 93 closed and open at 90 IIRC but it depends if you have standard or alloy rad.

Martin