DocWC Posted April 30, 2019 Share Posted April 30, 2019 Any of you guys having constant problems out of your LRU model air conditioning constantly? I've got 11 of these things, and just when I finally figured out how to re-engineer all the issues I was having on the early models, I got a handful of 2018's and they give me a headache constantly. It's a piss poor engineering design to begin with, but I've got trucks that literally EVERY component checks out on, and they still freeze up, or they suck too much condensation through the module and plug everything up, and the list goes on, and on. What are some of the things you've found wrong with them? I've got two of these 18 models that are giving me the blues right now. Freeze switches are good, charge is on the money, heater valves are closed (to isolate the electronic actuators from opening up the heat on their own.....yea, had 2 of them do that already), evaporators clean, pressures on the money when idle/high idle.....they'll take off down the road and an hour later they're froze up. Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/ Share on other sites More sharing options...
Mackpro Posted April 30, 2019 Share Posted April 30, 2019 I believe there are a few service bulletins on the LR climate systems. I’ll message you for details Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-421699 Share on other sites More sharing options...
Ryan Tenney Posted April 14, 2021 Share Posted April 14, 2021 Can you send me those bulletins as well. I cant find them on Mack impact. I have a fleet of LR'S and the A/C is terrible on all of them. Work great in the morning. then peters off during the day. The night shift mechanics check it out and it blows 40 degrees. Please send to tkarkowski@morganrubbish.com Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-472502 Share on other sites More sharing options...
Kford44 Posted June 16, 2021 Share Posted June 16, 2021 On 4/30/2019 at 5:59 PM, Mackpro said: I believe there are a few service bulletins on the LR climate systems. I’ll message you for details Hey mackpro is there any way you could email me about the mack bulletin my lr613 ac sucks bad and my dealer is lazy and i only have one dealer in town by me. thanks kfordf250@gmail.com thank you for the help Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-475266 Share on other sites More sharing options...
Mackpro Posted June 16, 2021 Share Posted June 16, 2021 I found 3 bulletins on the LR HVAC system. There is a little known process of calibrating the actuators for air flow , I’ll get them sent out in the morning Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-475292 Share on other sites More sharing options...
ScottCHU613 Posted July 28, 2021 Share Posted July 28, 2021 Mackpro, Any chance you could email me the bulletins. My truck is doing the same thing as described above. A/C blows cold for half the day and quits. The next morning I start the truck and it blows ice cold. thanks for the help Scott Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-477524 Share on other sites More sharing options...
Ron Sposato Posted August 5, 2021 Share Posted August 5, 2021 Hey Mackpro I'm having the same LR A/C problems as everybody else here,can ya send me the service bulletins as well. Would be much appreciated.Ron Sposato bigtruckacman@gmail.com Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-477991 Share on other sites More sharing options...
keithmaclroz Posted September 25, 2021 Share Posted September 25, 2021 I searched a lot, from different sources, for a solution that could help me. I think I read all the recommendations from google. I asked all my relatives, friends, and acquaintances for advice. I found three bulletins on the LR HVAC system. There is a little known process for calibrating actuators by airflow. I also decided to contact a good air conditioning repairman. The handyman solved my problem in a split second. I am delighted with the result. Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-480451 Share on other sites More sharing options...
ltowery Posted July 4, 2023 Share Posted July 4, 2023 Mack pro, can you send me the bulletins too. Having same issues with a/c on my trucks Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-534116 Share on other sites More sharing options...
GPWS Posted July 28, 2023 Share Posted July 28, 2023 On 9/25/2021 at 6:03 PM, keithmaclroz said: I searched a lot, from different sources, for a solution that could help me. I think I read all the recommendations from google. I asked all my relatives, friends, and acquaintances for advice. I found three bulletins on the LR HVAC system. There is a little known process for calibrating actuators by airflow. I also decided to contact a good air conditioning repairman. The handyman solved my problem in a split second. I am delighted with the result. WHAT WAS THE ISSUE? Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-535790 Share on other sites More sharing options...
Joey Mack Posted July 28, 2023 Share Posted July 28, 2023 That post is 2 years old.. Quote Link to comment https://www.bigmacktrucks.com/topic/56975-lru-ac-constant-problems/#findComment-535835 Share on other sites More sharing options...
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