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Circuit Board Posted by Dana [Email]  (#2822) [Profile/Gallery]
(more from Dana) on Sat, 17 Jun 2006 12:15:32
In Reply to: Urgent! Please...cooling fans - 1985 Turbo, jw, Sat, 17 Jun 2006 06:20:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Circuit Board....really no such thing in your 85 Saab unless you are talking about the fuse block connections. Please do the following with a 12VDC voltmeter.
Electrical power is always provided to the cooling fans in the 85 circuit, car running or not. 12VDC is powered through fuse #25 (30 ampere rating), a yellow wire runs from fuse #25 to a time delay off relay. The relay has a normally open electrical contact which shuts off the fans some time after the car is stopped. The other side of this electrical contact has a large yellow with white stripe wire which runs to the radiator thermosat switch on the drivers side upper corner of the radiator. If this thermosat closes on high radiator outlet temperator, it closes a contact. The other side of the thermosat switch has a green wire with runs down directly to the passenger side fan motor..... Again, the power path is only the fuse to delay relay to radiator switch to fan...nothing else.
Do the following:
1. Get a DC volt meter....measure from fuse #25 to car body and verify you have 12 VDC. Car does not have to be running.
2. Locate the time delay relay. On my 85 it is separate black relay "cube" (3" tall x 1" square with bottom electrical connector)which is clipped to inner engine compartment wall which run from the drivers side wheel well to the front of the car (toward the radiator). PUll off the bottom plug and measure for 12VDC between the yellow wire connection and car body. If you have voltage here then the wiring to the fuse #25 is good. If not find the loose connection.
3. You can jump out the time delay relay by jumping between the yellow wire and yellow with white stripe on the plug with the same gauge wire. The RELAY IS NOTORIOUS FOR FAILURE, causing the fans not to come on.
4. If you jump the relay contacts you can now measure voltage on the relay connector yellow with white stripe wire. This wire runs to the radiator switch and now you should be able to measure 12VDC at the thermosat switch. If the thermosat switch closes the fans should start. You could pull off the wiring to the temperature switch and touch the two wires together to test the fans if you had jumped out the delay relay previously. IF the fans start then you are good to go (if the radiator fan switch is working at the right temperature)....the link below will take you to the wiring diagram..its is the right side circuit on the diagram.
The time delay off relay is shown on the bottom right side of picture......
posted by 151.199.151...
, Sat, 17 Jun 2006 12:15:32 <-- Viewing This Message
, Sat, 17 Jun 2006 14:18:26
, Sat, 17 Jun 2006 06:37:18
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