Loud sound screeching and burning

[JExpedition07]

i started my truck and I heard a loud screeching noise while the motor runs. I popped the hood and my belt is not spinning and smoking, belt and tensioner ford oem only a few months old.... ceased pulley?

 

[JExpedition07]

only with air conditioning on, once u turn it off it’s back to normal..... is this a DIY friendly job or mechanic job?

 

[gixer2000]

Sounds like the siezed compressor I had done end of last summer. Ac on it screams, ac off it went quiet.

 

[JExpedition07]

Sounds like the siezed compressor I had done end of last summer. Ac on it screams, ac off it went quiet.

Yes it doesn’t look fun, new ford compressor is $250 on Rock Auto.

 

[stamp11127]

This is just an FYI...
There are two areas that an ac compressor can fail - internally (pistons and bores) or the bearings in the housing. If the pistons are seizing small amounts of aluminum will enter the refrigerant. They will flow through the entire system lodging in the hose liners, evaporators, condenser and accumulator or receiver drier.
Most shops will flush the evap & condenser maybe even the hoses. You will not get all of it out. The repeated heat/cool cycles of use will cause the metal to release back into the refrigerant, taking out the new compressor somewhere down the road.
If you plan on replacing the compressor yourself, after the system has been recovered, inspect the orifice tube or txv for metal shavings. If it is clear, bearing seized and you are good to go, if not then total up all of the parts including hoses and make a decision on rolling the dice.
You should change the accumulator or receiver/drier every time you change compressors.

The worst part of this is having rear air....

I had a Ford Aerostar a few years back. AC had the black death & took out the entire ac system. The techs back then couldn't figure it out, changed part after part trying to keep it running.

 

[JExpedition07]

My father has done HVAC and commercial refrigeration his whole life so hopefully I have everything I need at my disposal as he still has all his tools and equipment. Thanks for the advice stamp.

 

[stamp11127]

Different refrigerant on those systems but same principals. If he has a nitrogen bottle I would hit the system with that before recharging. Really dries the snot out of it. Won't have any moisture issues contaminating the r134a.

 

[bobmbx]

The orifice tube will tell the tale. It has a filter, so pull and inspect the screen closely. You may also be suffering from the black goo of death.

 

[gixer2000]

Different refrigerant on those systems but same principals. If he has a nitrogen bottle I would hit the system with that before recharging. Really dries the snot out of it. Won't have any moisture issues contaminating the r134a.

If he does commercial I'm sure he has 134a and nitrogen. I do commercial and R22, 134a and 410a are the most common refrigerants we use. Dry Nitrogen is great for helping dry the system. Replace all your components(compressor/drier/orifice tube), evacuate with your vacuum pump, sweep with nitrogen just to break the vacuum then run the vacuum again and charge.

We actually do what they call a tripple Evacuation on every system I open up. Basically pull a vac and sweep with nitro 3 times before charging.

 

[JExpedition07]

Black goo of death can’t beat money, I’ll have the entire system replaced if I have to..... not going hot lol. Anyway I’ll update soon.

 

[JExpedition07]

The weird part of this is it’s never had an issue, then the expy sat and didn’t get driven for about 7 days and then this happens out of the blue.... oh well

 

[JExpedition07]

I ordered New Motorcraft A/C Compressor w/ clutch, drier, and expansion valvex along with a new Motorcraft serpentine belt. Roughly $400 in parts for the expy today... gotta love RockAuto.

 

[JExpedition07]

Changed out compressor.....kind of, can’t finish the job

 

[JExpedition07]

Stopped for the day. Fan shroud won’t come out.

 

[JExpedition07]

System had metal shavings looks to me.

 

[stamp11127]

Check the orifice tube/txv for shavings. They will look similar to shavings from a hacksaw when cutting metal.

Usually the fan blade and shroud come out together to gain access.

 

[JExpedition07]

Check the orifice tube/txv for shavings. They will look similar to shavings from a hacksaw when cutting metal.

Usually the fan blade and shroud come out together to gain access.

Didn’t find any in there. Probably dirt dropped into the compressor as a lot of crap was falling on me upon removal. Flushed it anyway now just waiting for the dryer from Napa.

 

[JExpedition07]

Removing condenser had some confusion on what was actually the dryer lol.

 

[JExpedition07]

pain in the butt. I have to remove headlights, grille, front bumper to even get it out.

 

[JExpedition07]

Almost skipped filter but we will tear into it.