tcole

[TCole]

I hope someone can help me with this,I have a 2003 3500 I noticed when I stop and idle my ac doesn't blow as cold ,my clutch fan did not seem to be engaging I checked the fuses replaced the fan clutch it still don't seem to be engaging. I am getting code po633 skim secret key not stored in p c m .related or not I don't know

 

[cerberusiam]

Does it go completely warm at an idle or just less cool? You should have a fan code if the circuit is bad, maybe not if it just worn out,

 

[Bob4x4]

Make sure you have the ecm updated there was a flash to allow the fan clutch to come on when the ac is engaged while the engine is still cold