testing a thermo switch

jack1 · 03-08-10, 03:45 PM

hi,, anyone know how to go about testing a thermostat switch??

Emjay · 03-08-10, 03:54 PM

which thermostat, radiator? what car?, whats the problem?

jack1 · 03-08-10, 04:40 PM

1985 audi 90 ,rad . needle wont rise and red light fashing and water wont circulate

Micky · 03-08-10, 04:47 PM

did you fill the rad up from the top hose or the tank ?

jack1 · 03-08-10, 05:02 PM

Quote:

Originally Posted by Micky

did you fill the rad up from the top hose or the tank ?

tried both micky and it comes through on the bottom hose

Micky · 03-08-10, 05:07 PM

the way to test the temp gauge is to earth the wire and it should go all the way to the top .
does yours have a gauge or just the lights ?

jack1 · 03-08-10, 05:13 PM

Quote:

Originally Posted by Micky

the way to test the temp gauge is to earth the wire and it should go all the way to the top .
does yours have a gauge or just the lights ?

a guage micky with a red warning light

Micky · 03-08-10, 05:20 PM

when does the light come on ? is it straight away when you turn on the key .i am not sure about these systems weather it goes out after a wile or comes on when to hot

jack1 · 03-08-10, 05:29 PM

Quote:

Originally Posted by Micky

when does the light come on ? is it straight away when you turn on the key .i am not sure about these systems weather it goes out after a wile or comes on when to hot

as soon as you turn the key so im thinking the thermo switch firstly or then maybe the pump

Micky · 03-08-10, 05:34 PM

just unplug the switch on the rad and see if the light goes out . i am sure if you connect both wires together the fan should run permantly .
is it overheating at all .it does sound like a faulty switch tbh .

03-08-10, 03:54 PM	#2
Emjay Man Fettler Extraodinaire Classic Audi Club Member Join Date: Jul 2008 Location: Up my own arse blowing smoke Posts: 7,417	which thermostat, radiator? what car?, whats the problem?

03-08-10, 04:40 PM	#3
jack1 4 ring whore! Classic Audi Club Member Join Date: Apr 2009 Posts: 2,319	1985 audi 90 ,rad . needle wont rise and red light fashing and water wont circulate

03-08-10, 04:47 PM	#4
Micky Mr Fifty Thousand! Classic Audi Club Member Join Date: Apr 2008 Location: Birmingham Posts: 8,738	did you fill the rad up from the top hose or the tank ?

03-08-10, 05:07 PM	#6
Micky Mr Fifty Thousand! Classic Audi Club Member Join Date: Apr 2008 Location: Birmingham Posts: 8,738	the way to test the temp gauge is to earth the wire and it should go all the way to the top . does yours have a gauge or just the lights ?

03-08-10, 05:20 PM	#8
Micky Mr Fifty Thousand! Classic Audi Club Member Join Date: Apr 2008 Location: Birmingham Posts: 8,738	when does the light come on ? is it straight away when you turn on the key .i am not sure about these systems weather it goes out after a wile or comes on when to hot

03-08-10, 05:34 PM	#10
Micky Mr Fifty Thousand! Classic Audi Club Member Join Date: Apr 2008 Location: Birmingham Posts: 8,738	just unplug the switch on the rad and see if the light goes out . i am sure if you connect both wires together the fan should run permantly . is it overheating at all .it does sound like a faulty switch tbh .