Search found 75 matches

by Dgreen
Sun Sep 15, 2019 9:25 am
Forum: Automotive Air Conditioning Forum
Topic: Dodge Diesel Trucks Poor AC Performance
Replies: 2
Views: 865

Dodge Diesel Trucks Poor AC Performance

I’ve had three coworkers over the years ask me to check their ac on their diesel trucks. Always the same story, works ok, but not as cool as other vehicles they’ve drove. Didn’t find any problems on any of the three. Is it possible that the cooler running diesel motors don’t require the radiator coo...
by Dgreen
Wed Sep 11, 2019 5:15 am
Forum: Automotive Air Conditioning Forum
Topic: Slow Leak
Replies: 2
Views: 635

Re: Slow Leak

I pressurized the system with a little refrigerant then ran the pressure up just above 110 psi with nitrogen last night. This morning it’s just below 110 psi. Used a liquid leak detector, think it’s called Birddog, and didn’t find any bubbles. Electronic detector not making any noise around the port...
by Dgreen
Tue Sep 10, 2019 2:02 pm
Forum: Automotive Air Conditioning Forum
Topic: Slow Leak
Replies: 2
Views: 635

Slow Leak

I put a compressor on a 92 Ford van about 4 years ago. It’s came back twice out of refrigerant. The van is only driven about once a month. The only dye I see is a light dusting around the clutch and drive plate. It held vacuum at 310 microns for a couple hours this morning. I’m going to pressure tes...
by Dgreen
Thu Sep 05, 2019 10:06 am
Forum: Automotive Air Conditioning Forum
Topic: Micron Gauge
Replies: 1
Views: 205

Micron Gauge

I was vacuuming an 89 Suburban yesterday. I had a micron gauge where the low pressure switch attaches o the accumulator. Shut the pump and valves off at 380 microns. Gauge went down to 330 after things were shut off. Let the system sit for 25 minutes and it went up to 350. Is it normal to see a decr...
by Dgreen
Mon Aug 05, 2019 12:14 pm
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

New compressor installed. Still making noise. It’s a wore out power steering pump. Lots of in and out movement on the pump pulley.

Thanks again for the replies.
by Dgreen
Sat Aug 03, 2019 6:54 pm
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

It was still noisy after changing the coil. Ordered a new compressor. Mounting hardware was tight.

Thanks for all the replies.
by Dgreen
Thu Aug 01, 2019 5:18 pm
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

I have the coil off and will try a different coil tomorrow. If it still makes noise, I’ll recover some refrigerant. I think 40:oz was the factory r12 charge. System currently has 36 oz of r134a in it. Low side was sweating heavily all the way back to the compressor. Over charge might be a possibility.
by Dgreen
Thu Aug 01, 2019 3:03 am
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

Well, I changed the bearing and still have a noise. Also tried a different hub plate. Only thing I haven’t tried is a different coil and pulley. I put a stethoscope on the compressor and it sounds good.

Is it possible that the coil is weak and letting the clutch to slip and causing it to make noise?
by Dgreen
Tue Jul 30, 2019 1:48 pm
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

I had some success! Greased up the vacuum control switch with silicone grease and reinstalled. We have cold air blowing out the vents! The metallic noise is still there. Only when the clutch is engaged. I took the hub and hub plate off and didn’t see any problems. Reinstalled the clutch and set to ....
by Dgreen
Tue Jul 30, 2019 11:14 am
Forum: Automotive Air Conditioning Forum
Topic: 92 S10 Truck Blows Air Out Floor Vent Only
Replies: 15
Views: 565

Re: 92 S10 Truck Blows Air Out Floor Vent Only

The rotary vacuum switch on the AC and heater control is leaking. No luck finding one locally so far.

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