Why does my AC get warm while driving?
Hot air when driving and cold when idling probably means you have a vacuum leak somewhere and the vents are going to “defrost” instead of “people” (it’s probably still cold, just not aimed at you). If it was reversed (cold when driving, hot when idling), you need to check your fans and your refrigerant.
What does it mean when your AC only works when driving?
If your AC only works when you are driving, your engine is likely overheating. Your air conditioning compressor moves air to the condenser from the radiator. Therefore, an overheating engine coupled with an already-underperforming radiator or condenser can cause your air conditioning to malfunction.
Why does the AC blow cold air while driving?
The AC is now cold but only when the car is sitting idle. When driving it blows warm air. Any idea what could be the problem? Any help is greatly appreciated? Could be several things… Faulty pressure sensor. Suggest you hook up a AC manifold gauge set and see exactly what the system is doing.
Why does my AC only work when driving forward?
If the clicking is coming from under the dashboard, the problem may be the temperature blend door. This door directs incoming air through either the AC evaporator or the heater core (or a blend) depending on the desired temperature.
What to do when your car AC blows warm at idle?
GM and others use either a three-relay set up to run the two fans at low speed for normal driving and high speed when the AC is on or the low speed can adequately cool the radiator. Other carmakers use a solid-state speed relay that varies the speed of the fans based on engine cooling and AC needs.
How to fix a car that’s blowing hot air?
Scotty Kilmer, mechanic for the last 45 years, shows how to fix a car that is blowing really hot air, even though the AC system is turned on full cold. Often a bad main AC control unit goes bad, and he shows how easy it can be to replace. 1. Autel Diagnostic Tool: http://amzn.to/2nrT5op 2. Screwdriver set: http://amzn.to/2jaHIfP 3.