Re: How to test a relay? - Saab General Bulletin Board - Saabnet.com
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What car?
The radiator fan relay on a C900 worked something like this...
Energize the coil by turning on the car, it would close the circuit to the radiator fan. The fan wouldn't necessarily run because the radiator temperature switch was still open (cold).
There's a latching circuit with a timer in there. So after you turned off your car, it would allow the fan to keep running - IF the radiator temperature switch was still closed.
After some delay (4 minutes??), it would open the fan circuit, preventing the fan from draining your battery. This was just in case the radiator temperature switch stuck closed.
posted by 12.28.24...
Posts in this Thread:
- How to test a relay?, Vlad, Thu, 24 Jul 2003 06:28:02
- Re: How to test a relay?, JimBlake
, Thu, 24 Jul 2003 09:44:57 <-- Viewing This Message - Re: How to test a relay?, Dean, Thu, 24 Jul 2003 09:18:29
- Re: How to test a relay?, compaqted, Thu, 24 Jul 2003 07:42:16
- Re: How to test a relay?, Randy Thatcher
, Thu, 24 Jul 2003 07:34:45
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