When my car is in Heat mode, I can hear a relay clicking behind the glove box...I know there are relays out there behind the false firewall....should it click constantly, sounds like a clock ticking? Also, only when it's in heat mode, as it's clicking, it eventually cuts everything off. No fan, no control, no nothing. Zilch! Then after about 2 minutes, it clicks and comes back on. I've replaced the blower motor as someone suggested last winter and it needed it badly (commutator was really worn and gouged out) and I thought that fixed it...but it didn't. While it's working properly, the climate is comfortable...whatever I have it set on it seems to accomodate appropriately...it just stops. My aux water pump works fine. Once on a really hot day in stop and go traffic, the a/c and climate control and turn signals all stopped. Car was parked for a few minutes and after it all cooled off a little, it all started working again. Is this a failing relay?