Does anyone know if it is a mechanical or solid state unit? I intend to 'autopsy' mine when I install the new one. Considering that Toyota uses this relay in at least 5/6 other systems in the same fuse/relay box, I suspect that the A/C magnetic clutch load across the relay 'contacts' is issue. The relay is probably not sufficiently rated for the current it has to control. I haven't heard of this relay failing anywhere except for the A/C clutch application.

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TechWrench
"If it ain't broke, fix it 'till it is"
'03 SR5 V6, Titanium, 275/70R16 REVO's on '02 OEM alloys (winter), Anti-chipmunk mod for fresh air intake, Valley hitch upgrade, Hayden trans cooler, '91 Coachmen Catalina 260FK, '89 Grumman GSS w/35HP Force O/B, 8' Snowbear utility trailer.