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Radiator Fan Relay

For fan relay testing, see appropriate fan relay control circuit test. See the following:

On 4.7L, see DTC P0480: LOW SPEED FAN CONTROL RELAY CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - DURANGO - 4.7L article.
On 5.9L, see DTC P1491: COOLING FAN CONTROL RELAY CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - DURANGO - 5.9L article.