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2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Mon Aug 10, 2026 12:55 pm
by mcFish
Hello, need some help in troubleshooting my truck.
I’m not professional HVAC tech, but did my own compressor/radiator/valve replacement, vacuum pull and recharge AC on my old car.
2019 Nissan Frontier, 70k miles. Rebuild title. Was hit at right front side. Own almost a year.
AC is barely blowing some cold in Texas heat. Compressor works on and off.
Static pressure was around 100 psi with 95F ambient temperature.
I drained some freon.
Didn’t help much. Attaching video of gauges.
Need some guidance.
Gauges recording:
https://youtube.com/shorts/1Hh5JaIMgZU?feature=share
- IMG_2911 Medium.jpg (91.68 KiB) Viewed 187 times
- IMG_2914 Medium.jpg (100.09 KiB) Viewed 187 times
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Mon Aug 10, 2026 1:39 pm
by Tim
Your YouTube is set to private.
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Mon Aug 10, 2026 1:43 pm
by mcFish
Tim wrote: Mon Aug 10, 2026 1:39 pm
Your YouTube is set to private.
Thank you, changed to Public
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Mon Aug 10, 2026 1:54 pm
by Tim
I suggest reclaiming the refrigerant. Pull a vacuum, add back the specific refrigerant, and post your readings. You did not list engine size.
Refrigerant Type: HFC-134a
Refrigerant Capacity: 1.54 ± 0.11 lbs
Refrigerant Oil Type: PAG Oil Type R (DH-PR)
Refrigerant Oil, Total System Capacity: 6.087 ± 0.338 fl oz
Refrigerant Oil, with Condenser Replacement: 2.54 fl oz
Refrigerant Oil, with Compressor Replacement: Balancing Procedure
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Mon Aug 10, 2026 1:58 pm
by mcFish
Tim wrote: Mon Aug 10, 2026 1:54 pm
I suggest reclaiming the refrigerant. Pull a vacuum, add back the specific refrigerant, and post your readings. You did not list engine size.
This is what I've been thinking about as first step!!! Will do.
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Tue Aug 11, 2026 9:17 am
by Winaloxa
mcFish wrote: Mon Aug 10, 2026 12:55 pm
Hello, need some help in troubleshooting my truck.
I’m not professional HVAC tech, but did my own compressor/radiator/valve replacement, vacuum pull and recharge AC on my old car.
2019 Nissan Frontier, 70k miles. Rebuild title. Was hit at right front side. Own almost a year.
AC is barely blowing some cold in Texas heat. Compressor works on and off.
Static pressure was around 100 psi with 95F ambient temperature.
I drained some freon.
Didn’t help much. Attaching video of gauges.
Need some guidance.
Gauges recording:
https://youtube.com/shorts/1Hh5JaIMgZU?feature=share
IMG_2911 Medium.jpgIMG_2914 Medium.jpg
Based on your description of the situation and the pressure gauge readings, your truck’s air conditioning system is severely low on refrigerant. A static pressure of 100 psi at an outside temperature of 95°F (35°C) is a normal reading for a system at rest. However, the static pressure only indicates the presence of refrigerant in the system, not its volume. When you released some of the refrigerant, the situation only got worse, since there was even less refrigerant left.
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Tue Aug 11, 2026 9:25 am
by Tim
Winaloxa wrote: Tue Aug 11, 2026 9:17 am
mcFish wrote: Mon Aug 10, 2026 12:55 pm
Hello, need some help in troubleshooting my truck.
I’m not professional HVAC tech, but did my own compressor/radiator/valve replacement, vacuum pull and recharge AC on my old car.
2019 Nissan Frontier, 70k miles. Rebuild title. Was hit at right front side. Own almost a year.
AC is barely blowing some cold in Texas heat. Compressor works on and off.
Static pressure was around 100 psi with 95F ambient temperature.
I drained some freon.
Didn’t help much. Attaching video of gauges.
Need some guidance.
Gauges recording:
https://youtube.com/shorts/1Hh5JaIMgZU?feature=share
IMG_2911 Medium.jpgIMG_2914 Medium.jpg
Based on your description of the situation and the pressure gauge readings, your truck’s air conditioning system is severely low on refrigerant. A static pressure of 100 psi at an outside temperature of 95°F (35°C) is a normal reading for a system at rest. However, the static pressure only indicates the presence of refrigerant in the system, not its volume. When you released some of the refrigerant, the situation only got worse, since there was even less refrigerant left.
No offense, but I'm going to disagree. An expansion valve system should not run at 40 PSI during high idle. He needs to get back to the OE specs; otherwise, they are just guessing at the problem. If 40/300 post OE spec. Then you can start working on the problem. Might spray a mist of water on the condenser while running and see if pressure drops and cooling begins.
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Tue Aug 11, 2026 9:27 am
by mcFish
Pulling vacuum right now, will update in a few.
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Tue Aug 11, 2026 10:36 am
by mcFish
Pulled the vacuum, recharged 24 oz. Didn't help much.
But at least static pressure is 70 now at 95F.
AC working in same sequence - short start/stop.
Took it for a ride - min air temp from vent - 68F.
Attaching gauges video:
https://youtube.com/shorts/0Quf4k-mAGo?feature=share
Running pressure now 50/250
System spitting out a lot of yellow dye.
Possible someone tried to find a leak and dumped stop-leak goo?
- IMG_2927 Medium.jpeg (100.04 KiB) Viewed 13 times
Re: 2019 Nissan Frontier AC troubleshooting (Video link attached)
Posted: Tue Aug 11, 2026 10:57 am
by Tim
Mist the condenser and post pressures & temp.