The A/C Compressor Worked but the Cabin Stayed Warm: An 8-Volt Fan Ground Was the Real Fault
See why an A/C system had pressure but no cold air when a painted fan ground rose to 8 volts under load.
Tag loaded voltage drop
2004 SEAT Arosa Cranked but Would Not Start: One High-Resistance Relay Starved Several Circuits
See why a 2004 SEAT Arosa crank-no-start and odd cam signal came from a high-resistance engine-control relay exposed only under injector load.