Donald C Santa Barbara , CA April 17, 2021 Appliance: Whirlpool Gas Dryer WGD5520SQ0 Whirlpool Dryer Wgd5520sq0: Dryer would start to heat then go cold. How to replace Dryer Gas Valve Coil Kit. Replace the dryer gas valve coils. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours