2018 Peterbilt Not Cooling

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Dgreen
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Joined: Thu Jun 16, 2016 4:08 am

2018 Peterbilt Not Cooling

Postby Dgreen » Fri Jun 14, 2019 6:01 pm

A friend of mine that’s a truck driver txted me about his ac not blowing cold. Can’t put gauges on it until tomorrow. He said the clutch on the compressor stays engaged, but hasn’t been getting any cooling since yesterday. He just called and said it has started Cooling again. It has Paccar motor and I think a Sanden compressor. Would the expansion block be the first place to look?
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Tim
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Re: 2018 Peterbilt Not Cooling

Postby Tim » Sat Jun 15, 2019 3:22 pm

Evap may have frozen up. Refrigerant level and cycling would be areas look into.
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bohica2xo
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Re: 2018 Peterbilt Not Cooling

Postby bohica2xo » Sat Jun 15, 2019 6:29 pm

Check the clutch gap as well. A class 8 truck picks up a lot of miles in a year.
Dgreen
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Re: 2018 Peterbilt Not Cooling

Postby Dgreen » Sat Jun 15, 2019 7:56 pm

Got to put gauges on it today. It seemed to be working as it should. 30 low and 150 high on high idle. Vent temp 52. It was 78 and humid. Low side had condensation all the way to the compressor. He said he shut the truck off Thursday night and hit the road Friday. Said ac started to work Friday evening. Sure sounds like it froze up. I’ll ask a few more questions Tomorrow.
Dgreen
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Re: 2018 Peterbilt Not Cooling

Postby Dgreen » Tue Jun 18, 2019 8:56 am

Friend said the truck sat overnight with the ac off and it didn’t work the next morning when he tried it. Later that day he tried it again and it started working. Weird.
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bohica2xo
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Re: 2018 Peterbilt Not Cooling

Postby bohica2xo » Tue Jun 18, 2019 10:13 am

Weird. Almost like the clutch is not engaging?
Dgreen
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Re: 2018 Peterbilt Not Cooling

Postby Dgreen » Wed Jun 19, 2019 6:19 pm

It was still working as of yesterday.

When we were troubleshooting over the phone, he said the clutch was turning. I’ll post a reply if we ever find out what happened.

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