Manager Forum

I have a GMC Yukon that howls/whines at start up. After a few minutes it stops. The noise is coming from a valve at the right side under the hood on top close to the fire wall. Can anyone help me with the name of this valve.

need a bit more information

Yes, a year and an engine size would be helpful. Where exactly is this bolted?

i bet it's green.......

ahhh, the good old green muzi ford. this made me think of the goods old "parking lot" painters. i wonder how those whiz bangs are doing. are they still hanging around home depot ar have they returned to their native land by a plane ticket from the i.n.s. a walk down memory lane when simple things made us laugh.........

An email was sent to the original poster to circle back and provide more info for people that want to help on this repair.

Sorry, I'm a lot more professional than that. I also need to use this forum. This was Duhhhh moment. 2001 gmc Yukon 5.3.
Thank you all so much for your help.

Could it be the Secondary Air Injection Pump? It has 2 wires connected to it if I recall correctly.

for some reason that rings a bell...... I think there was a campaign out on the pump. if mammary serves me correct, i think it had issue with water in the pump. don't remember how it got there.

If you could post a pic of it I bet you would get an answer in no time.

i feel it prudent to mention this. the fan clutch is a real noise maker on these. the "valve" may be vibrating normally and the noise associated with it. i could fill a dumpster with these fan clutches that i've replaced. if this is the case beware of damaging the transmission lines and take real care in threading the clutch on the pump. i drip dish washing detergent on the threads. makes it a whole lot easier. seems to work better than oil..................