marcel1967 Posted August 16, 2019 Share Posted August 16, 2019 When driving with the ac on for over an hour, hardly any air comes out of the vents. Turn the ac off for a while and everything resumes to normal until air stops flowing again. Quote Link to comment Share on other sites More sharing options...
bbf2530 Posted August 16, 2019 Share Posted August 16, 2019 1 hour ago, marcel1967 said: When driving with the ac on for over an hour, hardly any air comes out of the vents. Turn the ac off for a while and everything resumes to normal until air stops flowing again. HI marcel. To give any type of informed reply, more information would be needed. For example, Do you have the single zone automatic temp control or dual zone auto temp control? I am not sure what was available in 2010. Does this happen in both Auto and manual modes? Does the manual fan speed control work properly? Will it raise and lower fan speed? When the airflow slows down, will adjusting the manual fan speed control do anything? Will the fan work properly in non-Auto and non A/C mode (i.e. to vent ambient air or if you raise the temp to heat the cabin)? Please try all the settings on your HVAC unit, then provide as much information as to how and when this occurs, what settings it occurs on etc. With more information, one of our tech members maybe able to point you in the correct direction. Good luck. Quote Link to comment Share on other sites More sharing options...
marcel1967 Posted August 16, 2019 Author Share Posted August 16, 2019 Dual zone automatic temp control. Happens in manual mode, however, in dual control. Had to turn ac off for a while, then air flow was re-established. It appears as though icing occurs somewhere restricting air flow. After air flow was re-established, I turned off dual control (so that same temp in the whole cabin) , seemed to work better. Also kept temp a little warmer instead of real cold. Fan controls work fine, I can hear it louder with increased speed. Thank you for responding. Quote Link to comment Share on other sites More sharing options...
bbf2530 Posted August 16, 2019 Share Posted August 16, 2019 (edited) 1 hour ago, marcel1967 said: Dual zone automatic temp control. Happens in manual mode, however, in dual control. Had to turn ac off for a while, then air flow was re-established. It appears as though icing occurs somewhere restricting air flow. After air flow was re-established, I turned off dual control (so that same temp in the whole cabin) , seemed to work better. Also kept temp a little warmer instead of real cold. Fan controls work fine, I can hear it louder with increased speed. Thank you for responding. Hi Marcel. If the lines are freezing, then it could be a problem with moisture in the system. That could mean a leak. Here is a generic explanation: http://knowhow.napaonline.com/car-ac-lines-freezing-up-heres-what-you-can-do-about-it/ You can also find more general information here: https://www.google.com/search?client=firefox-b-1-d&q=Lincoln+MKZ+HVAC+system+icing It could also possibly be a problem with the EVAP temperature sensor? Hopefully one of our tech members will jump in with more expertise and advice. Edited August 16, 2019 by bbf2530 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.