99 GMC sierra
February 15th, 2018, 7:26 PM
#1
CF Beginner
Thread Starter
Join Date: Feb 2018
Location: Indiana
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
99 GMC sierra
so my 99 GMC Sierra runs great until I turn the heat on, weather it’s on the floor or defrost it revs real high then goes down and so on and so on. No one can figure out why it’s doing this it’s not throwing any codes either. Anyone else had this issue?
