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Power Strokes
94-97 Tech
Ac weak at highway speeds
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[QUOTE="TexasJ, post: 1563830, member: 30660"] Hi guys, I have an AC problem I figured I'd submit to the hive mind here lol. I just had my truck into a local shop because my ac wasn't cooling enough. It was still blowing cold(ish), but if I sat at idle the temp at the vent would slowly climb. The shop evac'd the system and pulled the orifice tube, which they claim was full of metal shavings. So they replaced the compressor and drier, orifice tube, and Orings, and (supposedly) flushed the rest of the system before recharching with fresh freon and dye. This was tuesday of this week. Last night I went out of town (3 hrs away) and noticed that the AC, while still blowing cold(ish), is not cold ENOUGH. I also noticed that the fan speed is getting weak at about 70mph and higher, and at that point the temp at the vent will RISE. Below 70mph it's only getting down to about 58°F, and above 70mph the temp will rise to around 65°F or 70°F. If I sit at 70 or 75mph for longer than about 10 mins the fan will speed back up a little bit, then after a few minutes it will slow back down again, and back and forth it goes like that until I bring my speed under 70mph. It's about 100°F every day right now where I'm at in Texas, and I ain't built for this heat so I need to get this fixed ASAP. Any ideas on what could be causing this? I'm trying to decide if I need to take it into a shop where I'm at currently (3 hrs away from home), or if it's something simple I may try and fix it myself in the parking lot. My possible theories are: 1)The condensor is dirty/clogged, causing it to ice up and cycle temperature like it is. 2) The shop either under charged OR overcharged the system. 3) The blower motor is going out and can't maintain speed with the force of the wind hitting it when at highway speeds. Do any of those sound likely? Any other thoughts? Please let me know, thanks. [/QUOTE]
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Ac weak at highway speeds
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