relay question

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?

I unplugged the aux water pump and took a drive tonight while it was 48 degrees outside....heat worked fine, I could still hear the ticking of the relay, but it didn't kick the heat out. maybe the aux pump is over drawing current...but is that relay supposed to constantly click?

[mctwin2kman]

Is it your OVP relay or maybe the Climate Control AC Relay? They are both behind that wall!

I know both of them are back there...I just need to know if that constant clicking like the rhythmic ticking of a clock is normal...not an every-once-in-a-while click...constant

[mctwin2kman]

Doesn't click on my 1986 190E!

I didn't think that was normal...if it were, wouldn't it do it in cool mode too? I guess I'll get some new relays...maybe that will solve my aux. cooling fan problems too. Now....part numbers...I guess I'll just get them off my car...seems logical