Roger, your advice was right-on for me. Had the "Check Air Conditioner" warning on the nav screen that appeared momentarily after starting my 2003 GX-470. Since I was not certain whether the warning was due to MG CLT relay, I went into troubleshooting mode and purchased an aftermarket replacement relay at O-Reilly auto parts for $13.99 with a lifetime warranty. We'll see how long it holds out, but for now the error is gone and all is well. Thanks for the post!