Jeep Grand Cherokee Relay - Radiator Cooling Fan Motor Order Jeep Grand Cherokee Relay - Radiator Cooling Fan Motor online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store. Part 1 -Jeep PWM Fan Relay Test Troubleshooting an Apr 17, 2011This article will help you to diagnose the Pulse Width Modulated (PWM) fan relay on the 1999-2004 Jeep 4 Grand Cherokee SUVs and/or the codes P1491 (Radiator Fan Control Relay Circuit) dealer, at the time of this writing, will charge you $95 (US) to diagnose it.
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