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billyaaron
New User
Sep 23, 2026, 1:14 PM
Post #1 of 9
(96577 views)
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2016 Ram Bighorn 5.7 engine. My A/C stops working while I'm driving at higher speeds it may stay off for several miles and then come on for several miles. Cked my freon R1234 and it's full any ideas
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 23, 2026, 2:02 PM
Post #2 of 9
(96575 views)
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The evaporator may be freezing over. Are you in the habit of running the blower on low speed often?
PS, I suggest you change your user name before the spammers grab your email.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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billyaaron
New User
Sep 23, 2026, 2:17 PM
Post #3 of 9
(96571 views)
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It isn't freezing up the compressor stop pumping
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 23, 2026, 2:21 PM
Post #4 of 9
(96570 views)
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You're going to have to do testing while following a wiring diagram while the system is down to find the problem. When you say the compressor stops pumping, do you mean the clutch disengages? How do you know it's full of refrigerant?
I'll try to get you one. Is it Auto temp control or manual?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Sep 23, 2026, 2:23 PM)
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billyaaron
New User
Sep 23, 2026, 2:25 PM
Post #5 of 9
(96565 views)
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It's manual, and yes the clutch stop turning
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 23, 2026, 3:04 PM
Post #6 of 9
(96563 views)
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This is a 4 page diagram so it's going to take me a little time to capture and save it all.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 23, 2026, 3:31 PM
Post #7 of 9
(96562 views)
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It was actually 3 pages
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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billyaaron
New User
Sep 24, 2026, 3:53 AM
Post #8 of 9
(96555 views)
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Thank you so much Hammer Time, you have been very helpful
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 24, 2026, 3:55 AM
Post #9 of 9
(96554 views)
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No problem. Let me know if you have any questions about the diagram.
A scan tool would be very helpful here to look at the data stream. I see it uses a 3 wire pressure sensor that delivers actual pressure readings to the PCM for it to make decisions.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Sep 24, 2026, 3:58 AM)
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04 Suburban transmission 5.3 engine 4wd 175,000
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