Cutlass Ciera Cruiser V6-3300 3.3L (1989)
Radiator Cooling Fan Motor: Component Tests and General Diagnostics
System Diagnosis
1.
On models less heavy duty cooling, proceed as follows:
a. If coolant fan does not turn on, perform test A.
b. If coolant fan does not run for delay period after engine is turned off with coolant temperature above 226°F, perform test B.
c. If coolant fan runs continuously with A/C, if equipped, off, coolant temperature cool and engine running, perform test G.
d. If coolant fan does not run with A/C on and A/C system is operating normally, turn ignition switch to RUN position, disconnect A/C high
pressure switch connector and connect a fused jumper between dark green and black/white wires. If fan runs, replace A/C high pressure switch.
If fan does not run, check dark green and black/white wires for open.
e. If coolant fan does not turn off after 10 minutes when ignition switch is off, disconnect coolant fan relay connector. If coolant fan turns off,
replace coolant fan relay. If fan does not turn off, replace coolant fan delay relay.
2.
On models with heavy duty cooling, proceed as follows:
a. If puller coolant fan does not come on, perform test A.
b. If puller coolant fan does not run for delay period after engine is turned off with coolant temperature above 226°F, perform test B.
c. If pusher coolant fan does not turn on with coolant temperature above 226°F or with A/C on and A/C head pressure above 300 psi, perform
test C.
d. If puller and pusher coolant fans run with A/C on but not with A/C off and coolant temperature is above 226°F, check dark green/white wire
between splice S155 and coolant fan switch for open and, if wire is satisfactory, replace coolant fan switch.
e. If pusher and/or puller coolant fans do not run with A/C on and A/C system is operating normally, perform test D.
f.
If pusher coolant fan runs with ignition switch in OFF position, replace pusher coolant fan relay.
g. If puller coolant fan does not turn off after 10 minutes when ignition switch is off, disconnect puller coolant fan relay connector. If fan turns
off, replace puller coolant fan relay. If fan does not turn off, replace coolant fan delay relay.
h. If puller and pusher coolant fans run continuously with A/C off, coolant temperature cool and engine running, perform test E.
i.
If puller fan runs continuously with A/C off, coolant temperature cool and engine running, perform test F.
j.
If pusher fan runs with ALDL connector white/black wire terminal grounded, replace coolant fan relay diode.
TEST A: FAN OPEN TEST
1.
Disconnect connector from coolant fan switch, ground connector terminal with a fused jumper and turn ignition switch to RUN position. If fan
runs, replace coolant fan switch and proceed to step 3.
2.
If fan does not run, check and repair dark green wire, dark green/white wire and coolant fan relay diode, then proceed to step 3.
3.
Turn ignition switch to RUN position and ground white/black wire terminal of ALDL connector with a fused jumper. If fan runs, problem is ECM
related.
4.
If fan does not run, turn ignition switch to RUN position and ground dark green wire terminal of ECM 32 pin connector with a fused jumper. If fan
runs, problem is ECM related.
5.
If fan does not run, leave fused jumper connected as in step 4, turn ignition switch to RUN position, disconnect coolant fan relay connector (less
heavy duty cooling) or puller coolant fan relay connector (with heavy duty cooling) and measure voltage from brown and red wire terminals to
ground. If battery voltage is not present at one or both terminals, check attached circuit for open.
6.
If battery voltage is present at both terminals, leave fused jumper connected as in step 4 and measure voltage between brown and dark green wire
terminals. If battery voltage is not present, check dark green wire circuit for open.
7.
If battery voltage is present, connect 20 amp fused jumper between red and black/red wire terminals at the relay connector. If fan runs, replace
relay.
8.
If fan does not run, leave fused jumper connected as in step 7, disconnect coolant fan connector (less heavy duty cooling) or puller coolant fan
connector (with heavy duty cooling) and measure voltage from black/red wire terminal to ground. If battery voltage is not present, check black/red
wire for open.
9.
If battery voltage is present, move ground lead of voltmeter to black wire terminal of fan connector.
10.
If battery voltage is not present, check black wire for open.
11.
If battery voltage is present, replace coolant fan motor.
TEST B: FAN DELAY TEST
1.
Cycle ignition switch, then turn to OFF position, disconnect connector from coolant fan switch and ground connector terminal with a fused jumper.
If fan runs, replace coolant fan switch.
2.
If fan does not run, disconnect connector from coolant fan delay relay and measure voltage from orange wire terminal of ECM 24 pin connector
and from red wire terminal of ECM 32 pin connector to ground. If battery voltage is not present at one or both terminals, check attached circuit for
open.
3.
If battery voltage is present at both terminals, turn ignition switch to RUN position and measure voltage from pink/black wire terminal of ECM 24
pin connector to ground. If battery voltage is not present, check pink/black wire for open.
4.
If battery voltage is present, turn ignition switch to OFF position and measure voltage from pink/black wire terminal of ECM 24 pin connector and
ground. If there is more than 2 volts, check pink/black wire for short to battery voltage.
5.
If battery voltage is not present, measure voltage between orange and black/white wire terminals of ECM 24 pin connector. If battery voltage is not
present, check black/white wire for open.
6.
If battery voltage is present, ground coolant fan switch connector terminal with a fused jumper and measure voltage between red and dark
green/white wire terminals at relay connector.
7.
If battery voltage is not present, check dark green/white wire for open.
