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RADIATOR FAN CONTROL The radiator has a single cooling fan, with a two speed motor (Fig. 13). The fan is controlled by the • When air conditioning system pressure reaches 210 psi, fan will operate. • Coolant temperature reaches 215° F, fan will operate. • Models equipped with automatic transmission, a fluid thermister may have some influences on fan • Refer to tables below for fan operation. ELECTRIC FAN MOTOR TEST Refer to Powertrain Diagnostic Manual for proce- dure. For wiring diagrams of the fan motor systems refer to Group, 8W Wiring Diagrams. COOLANT CONCENTRATION TESTING Coolant concentration should be checked when any additional coolant was added to system or after a offers optimum engine cooling and protection against A hydrometer will test the amount of glycol in a mixture by measuring the specific gravity of the mix- A refractometer will test the amount of glycol in a coolant mixture by measuring the amount a beam of Some coolant manufactures use other types of gly- cols into their coolant formulations. Propylene glycol CAUTION: Do not mix types of coolant—corrosion Because ethylene glycol and propylene glycol do not have the same specific gravities, the use of a RADIATOR FAN OPERATION—2.5L ENGINE Radiator Fan Control A/C Pressure A/C Off Low High Fan On: 102°C 107°C Fan Off: 96°C 103°C A/C On Low High Low High Fan On: 102°C 107°C 1,448 1,718 Fan Off: 96°C 101°C 1,207 1,585 EATX Fluid Temperature Low High Fan On: 118°C 122°C Fan Off: 116°C 118°C Fig. 13 Cooling Fan 1 – TRANSMISSION OIL COOLER JX COOLING SYSTEM 7 - 15 DIAGNOSIS AND TESTING (Continued) |