Radiator fan Sequence 1990
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
90 white shop manual seemed vague as to when & how the secondary fan operates. Mine did not run when the AC was in use.
I installed a jumper wire to connect the two relay ground wires so that both fans start @ 228* or start when AC is selected. The AC works better (colder, sooner) & engine temps remain close to normal in traffic.
The fan relays are on a common bracket attached to the left side of the fan shroud.
I used insulated male/female butt connectors in the ground jumper wire. Connect in spring, disconnec in fall.
I installed a jumper wire to connect the two relay ground wires so that both fans start @ 228* or start when AC is selected. The AC works better (colder, sooner) & engine temps remain close to normal in traffic.
The fan relays are on a common bracket attached to the left side of the fan shroud.
I used insulated male/female butt connectors in the ground jumper wire. Connect in spring, disconnec in fall.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
I would believe that the 2nd fan is supposed to run anytime the A/C is selected under 35 MPH.
You need to check out fan relay + wiring connector to see of it is compromised somewhere along the frame.
You need to check out fan relay + wiring connector to see of it is compromised somewhere along the frame.
