A/c cuting out ,catalitic conv.

Use a gauge to check the charge of the a/c system. If the low side seems too high, you could have a problem with the orfice tube or the valves in the compressor.
If you open the throttle a little, does the compressor clutch disengage? Or does it just not blow as cold of air when you are accelerating?

[quote:d29ce81756="dipweed23"]Use a gauge to check the charge of the a/c system. If the low side seems too high, you could have a problem with the orfice tube or the valves in the compressor.
If you open the throttle a little, does the compressor clutch disengage? Or does it just not blow as cold of air when you are accelerating?[/quote:d29ce81756]Yes the clutch disengages and the fan quits blowing. When acceleration eases it all comes back on and can hear the air doors move.

[quote:f58ef78750="rammer"]Yes the clutch disengages and the fan quits blowing. When acceleration eases it all comes back on and can hear the air doors move.[/quote:f58ef78750]

I'll need more time to investegate this one... If the air doors are moving, and the compressor is turning off, and the fan quits on acceleration, it's a MUCH more in depth problem than just a charge. I'll try to find some wire diagrams and see what runs where.
It is a possibility that something is getting shorted out. Just don't know what yet. If I can't fin out the solution, maybe we can work to eliminate some possabilities before turning it over to someone else.

[quote:4fdb18a1b3="dipweed23"][quote:4fdb18a1b3="rammer"]Yes the clutch disengages and the fan quits blowing. When acceleration eases it all comes back on and can hear the air doors move.[/quote:4fdb18a1b3]

I'll need more time to investegate this one... If the air doors are moving, and the compressor is turning off, and the fan quits on acceleration, it's a MUCH more in depth problem than just a charge. I'll try to find some wire diagrams and see what runs where.
It is a possibility that something is getting shorted out. Just don't know what yet. If I can't fin out the solution, maybe we can work to eliminate some possabilities before turning it over to someone else.[/quote:4fdb18a1b3]At 1st I thought it was vacuum related. I was thinking map sensor. It seems like the wide open throttle switch was kicking in early. I thought that was controlled by the map sensor. The truck runs fine other than the rattle coming from the catalytic converter. Are the a/c controls run by vacuum? That was another thought I had. It deffently has something to do with engine load. Thanks for all of your help.

My brother has a similar truck. I will check out the A/C controls tomorrow or Tuesday and get back to you. I have a pre-op appointment on Wednesday and Sholder surgery on Thursday so after that it may be a little while before I can get back with you. I will give him a call and ask him to take his repair manual with him to work, and drop it by my house on his way home.
With a little diligance we will get this one figured out!