| 84 cooling fan runs constantly |
Subject: 84 cooling fan runs constantly by postalvette on 2011/3/1 8:10:57 Bought my son an 84 vette and as soon as you turn the ignition on the fan starts. Replaced the relay, no joy. Disconnected both the a/c pressure switch and the engine temp switch, fan still runs. Disconnecting the relay does stop the fan. Measure the green/white wire going into the relay and it goes straight to ground, but if I measure the wires from the a/c switch and the temp switch they read open. Is there a difference in the wiring for an 84 compared with later model years? I do have a check engine light on constant that I have to check. Can the ECM cause the fan to run constant? I've seen two different wiring charts for this, one looks like you have to have the grounds from either the a/c switch or temp switch to turn the relay on and power the fan. The other one takes inputs from both switches into the ECM and it sends the signal to the relay to energize the fan. Any help would be great! |
