Camaro RS V8-305 5.0L VIN E TBI (1990)
ground. If battery voltage is not obtained, check fusible link E and red wire for open, then connect voltmeter between terminal D (brown) and
ground. If battery voltage is not obtained, check FAN/FP fuse and brown wire for open. If battery voltage was obtained, proceed to step 2.
2.
With coolant fan relay disconnected, connect a 20 amp fused jumper wire between terminals E (red) and A (black/red). If coolant fan runs,
proceed to step 4. If coolant fan does not run, leave jumper in place and proceed to step 3.
3.
Disconnect coolant fan connector, then connect voltmeter between terminal B (black/red) and ground. If battery voltage is not obtained, check
black/red wire for open, then connect voltmeter between terminals B (black/red) and A (black). If battery voltage is not obtained, check black wire
for open. If battery voltage was obtained, repair or replace coolant fan.
4.
Reconnect coolant fan relay, then connect fused jumper from coolant fan switch connector to ground. If coolant fan runs, check or replace coolant
fan switch. If coolant fan does not run, check dark green/white wires for open. If wires are satisfactory, check or replace coolant fan relay.
Test B: Coolant Fan A/C Open
1.
Turn ignition switch to On position, then disconnect A/C control head connector and connect fused jumper wire between terminal B (dark green)
and ground. If coolant fan does not run, check dark green/white and dark green wires for open, then connect jumper between terminals B (dark
green) and A (black). If coolant fan does not run, check black wire for open. If coolant fan runs, repair or replace A/C control head.
Test C: Coolant Fan Does Not Turn Off
1.
If coolant fan runs with ignition in Off position, replace coolant fan relay.
2.
With ignition in RUN position and A/C Off, disconnect coolant fan switch. If coolant fan turns Off, check or replace coolant fan switch. If coolant
fan continues to run, check dark green/white and dark green wires and A/C control head for short to ground.
VIN F
If coolant fan does not turn on, perform test A. If coolant fan does not turn off with engine cool, A/C mode selector OFF and ignition switch in RUN
position, perform test B. If coolant fan does not turn on with A/C mode selector ON and head pressure above 233 psi, but does run with engine hot,
perform test C and, if only auxiliary coolant does not turn on, perform test D.
Test A: Coolant Fan Does Not Turn On
1.
Turn ignition switch to On position, then ground terminal B (white/black) of ALDL connector. If coolant fan runs, problem is ECM related.
2.
If coolant fan does not run, ground terminal C3/E8 (dark green/white) of ECM with a fused jumper wire. If coolant fan runs, problem is ECM
related.
3.
If coolant fan does not run, leave terminal C3/E8 grounded as in step 2. Disconnect coolant fan relay connector and measure voltage from terminal
D (brown) of coolant fan relay connector to ground. If no voltage is present, check brown wire and FAN/FP fuse for open.
4.
If battery voltage is present, lamp illuminates in steps a and b, disconnect coolant fan relay connector and connect fused jumper between orange
and black/red wire terminals. If coolant fan runs, replace coolant fan relay.
5.
If coolant fan does not run, leave terminal C3/E8 grounded as in step 2. Measure voltage between terminals D (brown) and F (dark green/white) of
coolant fan relay connector. If no voltage is present, check dark green/white wire for open.
6.
If battery voltage is present, measure voltage from terminal E (orange) of coolant fan relay connector to ground. If no voltage is present, check
orange wire and fusible link D for open.
7.
If battery voltage is present, disconnect coolant fan relay connector and connect a 20 amp fused jumper wire between terminals E (orange) and A
(red/black). If coolant fan runs, replace relay.
8.
If coolant fan does not run, leave jumper wire connected as in step 7. Measure voltage between terminal B (black/red) of coolant fan connector
and ground. If no voltage is present, check black/red wire for open.
9.
If battery voltage is present, leave jumper wire connected as in step 7. Measure voltage between terminals B (black/red) and A (red) of coolant fan
connector. If no voltage is present, check black wire for open.
10.
If battery voltage is present, replace coolant fan motor.
Test B: Coolant Fan Does Not Turn Off With Engine Coolant Cool, A/C Mode Selector OFF & Ignition Switch In RUN Position
1.
With ignition switch in RUN position, disconnect coolant fan relay connector and connect test lamp between terminals D (brown) and F (dark
green/white) of coolant fan relay connector. If lamp does not light, replace coolant fan relay.
2.
If lamp lights, check dark green/white wire for short to ground. If wire is satisfactory, problem is ECM related.
Test C: Coolant Fan Does Not Turn On With A/C Mode Selector ON & Head Pressure Above 233 psi, But Does Run With Engine Hot
1.
Turn ignition switch to On position, set A/C mode selector to MAX, disconnect fan A/C pressure switch connector, then measure voltage between
terminal B (gray) Of fan A/C pressure switch and ground. If no voltage is present, check gray wire for open.
2.
If battery voltage is present, measure voltage between terminal B (gray) and A (black/white) of A/C pressure switch connector. If no voltage is
present, check black/white wire for open.
3.
If battery voltage is present, connect a fused jumper wire between terminal B (gray) and A (black/white) of A/C pressure switch connector. If
coolant fans do not run, problem is ECM related.
4.
If coolant fans run, replace fan A/C pressure switch.
