radiator tempreture switches, are they all the same?
went to get a new switch today and i sais i had a 3 pin switch and there are abourt 12 different types from vx and £23 listed on epc, co could i get on of a cav/cally turbo as the cut in at a cooler temp if it was a 3pin switch, and also the was two different cricuit types to, somethink like NO/NC, or similar?
only one way - get the knackered one out and get the part number to be sure - i had the same prob a few years back and it was the only way to do it - when my rad went the switch in the rad i bought 2nd hand was different
The one for my cav turbo has three pins, but the guy a vx asked if the car had aircon when I got it, might mean there are differences and it was £12 and the plastics blue, my GSi one was yellow and had two pins.
1) 2 stage temp switch intended for use with a 2 speed fan.
These were fitted to
Cav 3 diesels
Astra 3 diesels
Simon P's Astra 3 cab
This it's used on the astra gsi too according to EPC.
At one temp one contact opens for slow speed (normaly a standard temp or a tad lower 100°) and at another temp (much higher than normal 110°) it cuts in at fast speed. The speeds don't matter though as you can wire them up how you want. (but 2 stage fans are excellent. All you need to do is fit a white ceramic resistor. Like this :
2) For air con cars.
Has a normal fan contact (but usually at a much higher temp 115°)
and a normally closed contact which turns the aircon off if the coolant if very hot (120°).
This type is no use to you.
A cavalier turbo with air con has a 2 pin switch which cuts in at 88° part no 90 357 303 I think. Sadly though you have to cut off your existing plug or adapt it somehow.
EPC lists loads of rad switches but it doesn't list their temps which is so bloody anoying it's untrue.
On certain cavalier 3's there is a spare two pin connector by the battery with brown/white/yellow wires.
Plug the resistor in here and screw is down to the two existing holes infront of the battery (as shown in pic) or to the fan bracket which is where it was fitted on later ecotec models.
Then remove old 2 pin temp switch and fit the 3 pin temp switch.
If the low temp cutin point is the same as your existing switch and it's a car that doesn't get very hot there is not much advantage except if you have a fan override switch fitted in the car in which case you should connect it to the brown/yellow wire so it runs slowly on override keeping things gently cool.
P.S - on the astra 3 the connector and resistor is usually screwed to the front panel or rear of fan.