I just replaced mine last night. It was 3+ years old and Sunday night it gave me the 'ol Whrr, Whrr, slow crank, *** puckered up. Did ok for a day. Then Tues night, same thing. NO WAY brother. I jumped right on that sht!!! She's very happy now. :)
I would unplug it a week in advance and do some drive cycles just my humble opinion I go through this every year here in my old '07 Hoe have to get that test done Monday as a mater of fact. :(
Which means I have to do the same and at 360K driving with the AFM engaged really scares the hell out...
List of parts in this post:
https://www.tahoeyukonforum.com/threads/coolant-hose-change.150552/#post-1910921
Picture of how they should be installed. I used a utility knife to cut away some of that firewall matting to make more room to access that tight spot.
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