Anyone know what would cuase an intermittent click under the dash? It don't happen very often but it drives me nuts when it does it. It's kind of a high low high low click. Also when I left for work this morning it sounded like my fan was running? What would cuase it to run when temp is 45 outside and coolant temp is under 140 degrees?

I dont know about the click but it is very common to hear your fan on a cold start up. The liguid in the clutch settles and the fan has to spin to re distribute said liquid for it to disenengage. Mine does it even in the winter on occasion.

If you're clicking happens more than the evening it could be cricket 

But seriously I had something similar happen and then it went away all by itself in my car I want to say was some sort of an insect

The only other thing I can think of is a relay

Sometimes my a/c clicks if knob in wrong position, but can't hear it at higher speeds. And 1 time had paper clip in drink holder making noise

Edited August 23, 20186 yr by 015point9

could be the HVAC blend door cycling back and forth trying to make up its mind. 

18 minutes ago, IBMobile said:

could be the HVAC blend door cycling back and forth trying to make up its mind. 

Always wondered what a blend door is clue me in please?

Blend dor is at very top oh hvac, it controls fresh or recycled air, old cars had a cable that you could put it anywhere. I still prefer all mechanical, I'd love to use windshield air without running ac, I need to find that relay mod that @IBMobile suggested to me a while back so I can have ac on a toggle switch instead of coming on when dodge engineers decided it should. I feel like I'm forced to something I don't agree with lol. 

Edit 

Never mind, found my tread

 

Edited August 24, 20186 yr by Dieselfuture

Could it be an auto reset circuit breaker

10 hours ago, Ed ke6bnl said:

Could it be an auto reset circuit breaker

 

Only two things with an auto reset breaker. Electric seat and electric windows.

 

11 hours ago, Marcus2000monster said:

Always wondered what a blend door is clue me in please?

 

Blend door on our truck is a stepper motor on the passenger side foot well that twist the blend door between cold (blocking off the heater core) or full hot (push all the air through the heater core). 

 

In this picture you can see the blend door in the full cold position. Look closely you can see how the door swing counter clockwise and the flap would direct the air toward the heater core. 

2 hours ago, Mopar1973Man said:

Blend door on our truck is a stepper motor on the passenger side foot well that twist the blend door between cold (blocking off the heater core) or full hot (push all the air through the heater core). 

Yeap that's what I meant  I was close enough