racer26@comcast.net Report post Posted September 3, 2020 08 Pace Arrow w24 gas chassis ac working fine and shuts down now no blower no ac or defroster. all fuses that I found are not blown . Anybody know of any hidden fuses under dash and their location. Share this post Link to post Share on other sites
kaypsmith Report post Posted September 4, 2020 Welcome to the forum. Have you tried all fan speeds including high? The blower switch has resistors on all settings except high, and if the resistors burn out the blower will not blow on the lower speeds. I'm assuming that you are referring to the dash air. Share this post Link to post Share on other sites
rls7201 Report post Posted September 4, 2020 (edited) Some place close to the batteries is a black box (battery control center.). Remove the lid. On the circuit board, close to the center, is an ignition relay that turns on and off with the key. It's designed to take the load off the ignition switch. Check for burned connection around the relay. Also you may find a failed fuse in the BCC. Is your AC vacuum controlled? If so it's probably from evans tempcon. https://www.proairllc.com/design-engineering/evans-tempcon-guides/ If your AC does not use vacuum controls, it's from Denso. https://densoheavyduty.com/hvac-systems Goto downloads for wiring prints. Richard Edited September 4, 2020 by RLS7201 Share this post Link to post Share on other sites
