Symptom Tests: Notes

SYMPTOM TEST INDEX

Symptom	Go To Test
Radiator fan does not run at all, but condenser fan runs with A/C ON.	A
Both radiator fan and condenser fan do not run on low or high speed with the A/C ON or when the engine coolant temperature is above 210°F (99°C).	Check the No. 3 (15-amp) fuse in the driver's under-dash fuse/relay box. If the fuse is faulty, replace it. If the fuse is OK, repair the open in the wire between the No. 3 (15-amp) fuse in the driver's under-dash fuse/relay box and the radiator and condenser fan relays.
Condenser fan runs but radiator fan does not run when the engine coolant temperature is above 199°F (93°C), but both fans run with the A/C ON.	Replace the radiator fan control relay.
Both radiator fan and condenser fan do not run at low speed when the engine coolant temperature is above 199°F (93°C), but both fans run with A/C ON and when the engine coolant temperature above 210°F (99°C).	B
Both radiator and condenser fans do not run when the engine coolant temperature is above 199°F (93°C), but radiator fan runs with A/C ON.	See appropriate MANUAL A/C-HEATER SYSTEMS article in HVAC.
Both radiator fan and condenser fan run with ignition switch ON, with A/C OFF, and when the engine temperature is below 99°F (93°C).	C
Both radiator fan and condenser fan do not run at high speed with the A/C ON.	See appropriate MANUAL A/C-HEATER SYSTEMS article in HVAC.
Both radiator fan speed and condenser fan speed do not change from Low to Hi when the engine coolant temperature is 210°F (99°C), but both fan's speed change with A/C ON.	D
Condenser fan speed does not change from Low to Hi with A/C ON or the engine coolant temperature is above 210°F (99°C).	See appropriate MANUAL A/C-HEATER SYSTEMS article in HVAC.