Cooling fan switch variants

[Kagor 0]

Hi,

 

I have done a good search on the forum but could not find a clear answer, hence another temperature switch question for you.

 

The car is a 205 GTI 1989 1,9L XU9JAZ (DKZ)

 

My radiator fan does not turn on during normal use and I am risking overheating the engine at stand stills. The work on the coolant system so far: the thermostat is replaced and opens correctly, the cooler radiator core is replaced to a new Nissens one, also a new heater core is installed. I did troubleshoot the fan motor and it powers on when 12V is fed directly.

 

At the moment, I am suspecting the coolant temperature switch and want to order a new one, however, I cannot work on the car for a while, to pull out and identify the old temp switch.

 

Is there a way to find the correct part number and temperature range installed on the car by some other way?

 

I am of course considering models valid up to 01/1990, as the pin arrangement on my switch is the early type with two vertical and one horizontal pin.

 

 

 

Thank you 

 

[petert 598]

Hi, being DKZ, I take it yours is Motronic? If so, I thought it would have had the later type with three pins in a row. A connector similar to the throttle body?

[Tom Fenton 1,547]

Correct switch for a GTI in the UK is 1264 22.

It is identified by a red band around the switch body.

Check your car as it may be different in Europe.

[DamirGTI 344]

For ID which of the temp. variations you have , will need to undo and remove the switch from the radiator and read the temp. ratings written on the switch .

 

Over here , i found purple ring switches common fitment ...

 

D

[petert 598]

Being a DKZ, I assumed it would be like this, with 87-92 and 92-97 cut offs.

[Kagor 0]

7 hours ago, petert said:

Hi, being DKZ, I take it yours is Motronic? If so, I thought it would have had the later type with three pins in a row. A connector similar to the throttle body?

The registered engine output is 90kw, which seems like a DKZ. However 1989 is the transition phase, the car exterior/interior looks like phase 1,5.

[Kagor 0]

Is there an easy way to identify the Motronic system?

[Kagor 0]

4 hours ago, Tom Fenton said:

Correct switch for a GTI in the UK is 1264 22.

It is identified by a red band around the switch body.

Check your car as it may be different in Europe.

Hmmm, this one is the hot running one.

[petert 598]

Look at the dizzy cap. Which one?

[welshpug 1,666]

its totally separate to the cooling fan control so I wouldn't worry about that.

 

 

but the MOTRONIC printed on the ecu is rather a large giveaway, also the AFM has a different part number, and the distributor doesnt have a vacuum advance and there will be a crank sensor in the top of the bellhousing.

[petert 598]

Yes, whilst fan control is separate, they work differently. The Motronic version turns the relays on by switching the negative(s) not the positive(s).

[welshpug 1,666]

is that for the ac twinfan setup?

[Kagor 0]

3 hours ago, petert said:

Look at the dizzy cap. Which one?

It looks like the black one.

[Kagor 0]

6 hours ago, DamirGTI said:

For ID which of the temp. variations you have , will need to undo and remove the switch from the radiator and read the temp. ratings written on the switch .

 

Over here , i found purple ring switches common fitment ...

 

D

Ok, thanks!

One manufacturer of temp switches suggest these, The colour markings seems to have appeared with the transition to the later three pin in a row model. I think someone else on this forum has also confirmed that.

[DamirGTI 344]

Yes , previous models switches had only temp. rating written on them .. no color markings .

 

Later ones have both , but can be a bit hit and miss going just by color markings depending on the brand of the switch .. certainly isn't standardized between all the aftermarket manufactures , so always double check the switch rating written/embossed on the actual switch or particular switch specs. if buying online .

 

D

 

 

 

[Kagor 0]

Just had a look at the temp switch and  it was indeed the early model |_|

 

temperature range: 97/92-110/96 deg C

Part number:  1264 22

 

Thank you all for your help!

[petert 598]

I've never seen a DKZ with an early temp sensor. You learn something everyday.

 

Yes Mei, I was referring to twin fan setups, whether early or late.

[Kagor 0]

I am really confused, the parts vendor recommends a couple of lower temp range models and never mentions the higher temp 1264 22 why is this so difficult  Has there been a service bulletin out or what? I have no history of the car, the fan has never been working properly before, so no reference.

To maintain ideal engine temperature, I suppose that the location of the temp switch makes a difference, coupled with some other factors, hence the different options of temp range.

 

In how many positions can you find these switches in?

 

Am I overthinking this or how sensitive are these aluminum block engines? The last thing I want to see is engine damage from excessive heat or a noisy fan.

[welshpug 1,666]

they will be fine on the standard switch.

[Kagor 0]

1 hour ago, welshpug said:

they will be fine on the standard switch.

Hi welshpug,

 

do you mean 1264 22 ranging between 97/92 - 101-96 deg C 

 

 

Thanks.

[DamirGTI 344]

Personally , i see no need for the highest rating switch .. in fact i tend to avoid them .

 

I'd go with the middle range switch , that'll be "97-92 92-87" or purple/violet as Peter posted above ... along/combine with the 88C thermostat .

 

 

D

 

[petert 598]

It's very important to match the thermostat to the switch. For example, if you fit an 82 switch with a 92 thermostat, the fan(s) never turn off.

[Kagor 0]

I wouldn't want that for sure. 

The current thermostat is an 89 deg C, I'll try to fit a 1264 18 switch, 93/88 - 97/92 deg C

Thank you all.