Clicking when heat is on

[doylee4693]

My truck clicks when the heat is on.You cant really hear it inside but you can outside.It clicks like every 6 seconds.Any ideas?

 

[chauncey0337]

If it also does it when AC is on, then it sounds like it might be the AC compressor. I believe it engages when the heat is on too.

 

[doylee4693]

I didnt know it worked when heat was on!my buddy said his new silverado does the same thing!