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96 Ranger Compressor cycling

Cabot on Sat July 07, 2007 7:29 PM User is offline

Year: 1996
Make: Ford
Model: Ranger
Engine Size: 2.3
Refrigerant Type: 134a
Ambient Temp: 82
Pressure Low: 44
Pressure High: 230
Country of Origin: United States

Replaced compressor (front seal leak) pulled a good vac and serviced w/26 oz. During servicing my pressures were 36L and 210H, good vent temps. Drove truck around and noticed that the compressor would cycle every 25/30 seconds. Got it home and now my pressures are 44L 230H at idle. It is cooling good but seems to be short cycling a bit. Any suggestions?

JJM on Sat July 07, 2007 10:35 PM User is offline

Have you checked the cut-out pressure on the low side? Perhaps it's a bit too high, which could be the result of the switch being out of adjustment or just plain on its way out.

Was the compressor cycling with the blower on high? Low blower speeds at that ambient certainly will result in cycling.

Did you check and/or replace the OT? If the OT is restricted even ever so slightly, cooling performance and pressures might be within range, but the cycle rate will increase. When you had the system open, I hope you replaced the accumulator.

Finally, after more than 10 years, your evaporator coil could be dirty, and the reduced airflow would result in cycling just like if the blower speed was lower. Smoking almost always makes for a dirty evaporator - not to mention the rest of the interior. As someone who enjoys a fine Montecristo or Dunhill, I'm not saying this as a smoking Nazi... just that I wouldn't enjoy them in the confines of a vehicle.

Joe

Cabot on Sat July 07, 2007 10:41 PM User is offline

JJM
Thanx for the quick reply

New Ford Blue OT, new accumulator, took out evap (pita) cleaned and put back in. The compressor is a ready-aire reman. Do ya think it is over charged?

JJM on Sun July 08, 2007 2:24 PM User is offline

I checked two different sources and your vehicle calls for 22 oz of R-134a... but I have seen cases where underhood stickers on Ford's differ from shop manual specs, in which case I go by the underhood sticker.

Still, your pressures do not indicate an overcharge by any means, and are not high enough to be hitting the HPCO - unless the HPCO is going.

You need to find what's cutting the compressor the CPS or HPCO. You really need to get us the cut-out pressures. The CPS should be cutting out at around 19-21 PSI.

Joe



TRB on Sun July 08, 2007 6:15 PM User is offlineView users profile

Not saying it is the problem. I do not like Ready-Aire remanufactured compressors.

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Bob K on Fri October 05, 2007 2:49 AM User is offline

Cabot--Any more info on your Ranger compressor cycling issue?

2POINTautO on Fri October 05, 2007 5:39 PM User is offlineView users profile

Unlike the others, I am concerned of the HI pressure, it should not go over 2.5 ~ 2.7 times ambient, I would want to monitor both pressures during a drive cycle and see exactly what is going on here, you are going to have to rig up your gauges and go for a drive, your compressor will cycle at the same pressure each time I am willing to bet, either at the LO end or the HI end of the spectrum.

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Give all the dirty details
and dont forget the LO & HI pressures
Year, Make & Model would be nice too

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