Neodeus Posted August 1, 2020 Share Posted August 1, 2020 Hello, Today a friend installed the AC belt in our 2009 Subaru Legacy because it had snapped. We got the belt put back on but when you turn on the AC it just squeals real loud. The belt spins normally when it is off, but when you turn on the AC it grabs the belt (stopping it for a short moment) then starts spinning. A real loud squeal comes from the AC compressor area. So I am wondering if it is most likely one (or more) of the following 3 things 1 - The AC compressor clutch 2 - The compressor itself seizing. If this is the case is it something you can possibly change yourself. It is right up top, but not sure what's involved. 3 - There seems to be a crack along the side of the receiving part of the tensioner bracket where the long screw screws in. So not the top part where the long bolt is, but the part it screws it down in to down by the pulley wheel. Could it be that this is preventing it from tensioning correctly and that is why it is squealing? Please let me know what you think, and thanks for any responses. Link to comment Share on other sites More sharing options...
rhino6303 Posted August 1, 2020 Share Posted August 1, 2020 Did you tension the belt properly? It should be able to move something like 7-9mm when a 22 lb force is applied to the longest portion of the belt. Link to comment Share on other sites More sharing options...
Neodeus Posted August 2, 2020 Author Share Posted August 2, 2020 Yeah we had no way to tell. It felt tight, but that tensioner had a crack in it, so who knows. We may have to try a new tensioner first. Link to comment Share on other sites More sharing options...
Max Capacity Posted August 2, 2020 Share Posted August 2, 2020 Yeah we had no way to tell. It felt tight, but that tensioner had a crack in it, so who knows. We may have to try a new tensioner first. That ^ 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Neodeus Posted August 2, 2020 Author Share Posted August 2, 2020 Thank you for the replies. I will try replacing the tensioner first. Link to comment Share on other sites More sharing options...
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