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Discussion Starter #1
Hi Guys,
Brand new to the site.
Have had my 2011 Titan since new. Its been a great truck (except for the fuel economy).
A couple of days ago I started noticing a HUM. Sounds like a pump, pressurizing something...for around 10 seconds...everytime I start the engine or shut it off.
It seems to be coming from the relay pack under the hood.
I've seen the thread re cabin noise related to climate control actuators.
This isn't the noise.
Any ideas?
Thanks
Jerry
 

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6,584 Posts
Bad gear in the A/C damper servo system. There are lots of posts about the problem.
 
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