Diagnosis And Testing - Radiator Fan Control
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Fan control is accomplished three ways. The fan runs when the air conditioning pressure reaches a set psi. See charts below. In addition to this control, the fan is turned on by the temperature of the coolant which is sensed by the coolant temperature sensor which sends the message to the Powertrain Control Module (PCM). The PCM turns on the fan through a fan relay. On models equipped with automatic transmission, a transmission fluid thermistor may have some influences on fan operation. See appropriate SYSTEM WIRING DIAGRAMS article for circuity and diagnostics provided.
The Powertrain Control Module (PCM) provides fan control for the following conditions:
- The fan will not run during cranking until the engine starts no matter what the coolant temperature is.
- Fan will run when the air conditioning clutch is engaged, low pressure cutout switch is closed and once set compressor head pressure is reached. See charts.
- Fan will run according to the following information charts.
RADIATOR FAN OPERATION-2.0L ENGINE
| Radiator Fan Control | A/C Pressure | |||
| A/C Off | Low | High | - | - |
| Fan On: | 104°C (220°F) | 110°C (230°F) | - | - |
| Fan Off: | 99°C (210°F) | 104°C (220°F) | - | - |
| A/C On | Low | High | Low | High |
| Fan On: | 99°C (210°F) | 110°C (230°F) | 1,466 kPa (209 psi) | 1,717 kPa (249 psi) |
| Fan Off: | 93°C (200°F) | 104°C (220°F) | 1,172 kPa (170 psi) | 1,579 kPa (229 psi) |
| EATX Fluid Temperature | Low Speed | High Speed | ||
| Fan On: | 109°C (228°F) | 111°C (232°F) | ||
| Fan Off: | 104°C (220°F) | 109°C (228°F) | ||
RADIATOR FAN OPERATION-2.4L ENGINE
| Radiator Fan Control | A/C Pressure | |||
| A/C Off | Low | High | - | - |
| Fan On: | 104°C (219°F) | 110°C (230°F) | - | - |
| Fan Off: | 99°C (210°F) | 105°C (221°F) | - | - |
| A/C On | Low | High | Low | High |
| Fan On: | 99°C (210°F) | 110°C (230°F) | 1,448 kPa (210 psi) | 1,718 kPa (249 psi) |
| Fan Off: | 93°C (199°F) | 105°C (221°F) | 1,207 kPa (175 Psi) | 1,585 kPa (229 Psi) |
| EATX Fluid Temperature | Low Speed | High Speed | ||
| Fan On: | 109°C (228°F) | 111°C (232°F) | ||
| Fan Off: | 104°C (220°F) | 109°C (228°F) | ||
RADIATOR FAN OPERATION-2.7L ENGINE
| Radiator Fan Control | A/C Pressure | |||
| A/C Off | Low | High | - | - |
| Fan On: | 104°C (220°F) | 110°C (230°F) | - | - |
| Fan Off: | 98°C (208°F) | 105°C (221°F) | - | - |
| A/C On | Low | High | Low | High |
| Fan On: | 99°C (210°F) | 110°C (230°F) | 1,448 kPa (210 psi) | 1,718 kPa (249 psi) |
| Fan Off: | 93°C (199°F) | 105°C (221°F) | 1,207 kPa (175 psi) | 1,585 kPa (229 psi) |
| EATX Fluid Temperature | Low Speed | High Speed | ||
| Fan On: | 109°C (228°F) | 111°C (232°F) | ||
| Fan Off: | 104°C (220°F) | 109°C (228°F) | ||