Just want to say that I've learned a ton on here over the past year and a half. I'm currently confronted with a couple of issues. I had the valley pan gasket replaced on my 2004 (54k miles) a couple weeks back and I've started to notice my coolant level dropping ever so slightly. I'm taking it back to the shop next week, but I cannot for the life of me find where the coolant is going (not on the pavement, can't hear/see any on the engine block...). On this one, just looking for a little direction before I take it back in.

Second, in the past week I've noticed a "clicking" sound when I start the truck in the morning and when I leave work. It lasts for 15-20 seconds and also does not happen when the engine is warm and is started.

Thanks for any help/direction you can provide.

 

The clicking noise you hear is the SAI pump, do a search for it, it is a emission device.

As for the coolant, hard to say.