A/C cycling between warm and cold air.
05-26-2017, 10:52 PM
#1
Thread Starter
Join Date: 05-26-2017
Location: Vincennes, Indiana
Posts: 6
A/C cycling between warm and cold air.
Hi, my A/C is cycling between warm and cold air. It will run hot a few seconds after it's turned on and usually gets cold again if I change the air distribution knob to another setting. Like from floor to dash or defrost to dash. Then it will get hot again so I change it and it's cold for a few seconds then hot again... Sometimes it works fine for hours. Could it be the AC Clutch relay or mode door? Searching seems to point to these. I don't know much about cars other than the basics but I'm learning. Replaced my stuck thermostat a few days ago and it has been running great. Had AC for a little and then it started going out again. R134a pressure is good. I had attributed the intermittent cold air to the thermostat sticking and working whenever it felt like it. I hoped it would fix the AC but that wasn't the case. No check engine light. No codes yet. 2008 LS. Thanks!
Last edited by Steve Allen Walls Jr.; 05-27-2017 at 08:32 AM.
05-27-2017, 07:46 AM
#3
Platinum Member
Join Date: 12-06-2009
Location: Alabama
Posts: 11,099
Welcome to the site.
You said " Coolant charge is good" Guessing you mean the refrigerant or freon.
Since you also stated " I don't know much about cars" how did you check the freon charge ? Not a basic task unless you have the proper AC gauges.
Fwiw. Always best to include your cars year and mileage when asking for advice. It helps us to help you since there are some differences between the year models.
You said " Coolant charge is good" Guessing you mean the refrigerant or freon.
Since you also stated " I don't know much about cars" how did you check the freon charge ? Not a basic task unless you have the proper AC gauges.
Fwiw. Always best to include your cars year and mileage when asking for advice. It helps us to help you since there are some differences between the year models.
05-27-2017, 07:59 AM
#4
Technical Moderator
Join Date: 01-23-2009
Location: Fredericksburg, Virginia
Posts: 24,696
Is this new behavior?
It blows hot, even when the temp is turned all the way to Blue?
The AC runs in defrost and recirculate without the light turning on.
Just to be sure you know how it is supposed to work review the Owner Manual. If you don't have one a free digital copy is available from the link in my sig.
It blows hot, even when the temp is turned all the way to Blue?
The AC runs in defrost and recirculate without the light turning on.
Just to be sure you know how it is supposed to work review the Owner Manual. If you don't have one a free digital copy is available from the link in my sig.
05-27-2017, 08:37 AM
#6
Thread Starter
Join Date: 05-26-2017
Location: Vincennes, Indiana
Posts: 6
Filters good. Coolant was flushed a while ago. The system was burped. I used whatever autozone gave me. I don't remember the brand could have been duralast.
05-27-2017, 08:39 AM
#7
Thread Starter
Join Date: 05-26-2017
Location: Vincennes, Indiana
Posts: 6
05-27-2017, 08:43 AM
#9
Thread Starter
Join Date: 05-26-2017
Location: Vincennes, Indiana
Posts: 6
Is this new behavior?
It blows hot, even when the temp is turned all the way to Blue?
The AC runs in defrost and recirculate without the light turning on.
Just to be sure you know how it is supposed to work review the Owner Manual. If you don't have one a free digital copy is available from the link in my sig.
It blows hot, even when the temp is turned all the way to Blue?
The AC runs in defrost and recirculate without the light turning on.
Just to be sure you know how it is supposed to work review the Owner Manual. If you don't have one a free digital copy is available from the link in my sig.
05-27-2017, 08:48 AM
#10
Thread Starter
Join Date: 05-26-2017
Location: Vincennes, Indiana
Posts: 6
Welcome to the site.
You said " Coolant charge is good" Guessing you mean the refrigerant or freon.
Since you also stated " I don't know much about cars" how did you check the freon charge ? Not a basic task unless you have the proper AC gauges.
Fwiw. Always best to include your cars year and mileage when asking for advice. It helps us to help you since there are some differences between the year models.
You said " Coolant charge is good" Guessing you mean the refrigerant or freon.
Since you also stated " I don't know much about cars" how did you check the freon charge ? Not a basic task unless you have the proper AC gauges.
Fwiw. Always best to include your cars year and mileage when asking for advice. It helps us to help you since there are some differences between the year models.
