And you test for that by shorting pin 3 of the switch plug to earth.
If the fans then come on at the low speed, it’s confirmed.
Plenty of context here:
http://www.frenchcarforum.co.uk/forum/v ... hp?t=19090
Xantia Overheating
Moderator: RichardW
N93489 looks like it's for air-conditioned turbo-diesels.
2 listings for petrol engines, you're after the 2-pin one, probably N93491.
N93474 RADIATOR THERMO SWITCH XANTIA ALL PETROL, MANUAL G/BOX 8.00
N93476 RADIATOR THERMO SWITCH XANTIA TD (NO AIRCON) 8.50
N93489 RADIATOR THERMO SWITCH XANTIA TD + AIRCON 8.50
N93491 RADIATOR THERMO SWITCH XANTIA PETROL MANUAL G/BOX 7.50
2 listings for petrol engines, you're after the 2-pin one, probably N93491.
N93474 RADIATOR THERMO SWITCH XANTIA ALL PETROL, MANUAL G/BOX 8.00
N93476 RADIATOR THERMO SWITCH XANTIA TD (NO AIRCON) 8.50
N93489 RADIATOR THERMO SWITCH XANTIA TD + AIRCON 8.50
N93491 RADIATOR THERMO SWITCH XANTIA PETROL MANUAL G/BOX 7.50
2002 C5 2.0i AL4 230,000 km 76372389
Maybe not.
It’s not likely to be critical.
A little bit of fiddling should enable you to make ‘accommodations’ to make the 2-pin plug fit.
Can’t see from this distance, but if the new switch has 3 pins, you only use pins 1 & 3.
Pin 1 is earth, and pin 3 is the switch for the lower temperature.
You can connect the 2 plug wires to pins 1 & 3 of the switch in whatever order, because it’s either switch open when cool, or switch closed when hot.
It’s not likely to be critical.
A little bit of fiddling should enable you to make ‘accommodations’ to make the 2-pin plug fit.
Can’t see from this distance, but if the new switch has 3 pins, you only use pins 1 & 3.
Pin 1 is earth, and pin 3 is the switch for the lower temperature.
You can connect the 2 plug wires to pins 1 & 3 of the switch in whatever order, because it’s either switch open when cool, or switch closed when hot.
2002 C5 2.0i AL4 230,000 km 76372389
As the coolant system system is, though airtight, not under vacuum, air-lock build ups are possible due to the movement of air/water in the standard cycle and the opening and closing of the thermostat etc. Obviously in normal circumstance the air will make its way to the highest point in the system, but if the pockets of air become compartmentalised they may turn into 'air-locks'.RichardW wrote:I think spontaneously occurring cooling system air locks are a myth - how can you suddenly get an air lock - unless work has been done on the system - or it's losing water?
However, you are partially right in as much as coolant systems ought to be designed so that this doesn't happen.
'00 Saxo VTR