A/C blows hot air but will blow ice cold under some circumstances

5

Asked by Aug 05, 2016 at 02:42 PM about the 2013 Lexus IS 250 AWD

Question type: Maintenance & Repair

My A/C blows hot air but will blow cold if the ABS system is engaged or if the brake is depressed suddenly/hard.  This "activates" the Cold air and I will get cold A/C for 3-4 min.  Eventually it will go back to warm/hot air again until I go through this same scenario. I have had Freon added to the system and its pressured up as well as having a new O-ring.  Prior to the "brake" activation trick, it worked if I turned it off and back on or if I turned the high/low level up a few notches.  I discovered the cool breeze accidentally from braking suddenly, however I have tested it many times.    Additionally, my right blinker works in the mornings but it gives me a "fast" blink in the afternoons.    Other than my thought that my car is possessed, what could be the issue?

1 Answer

23,855

The AC only works if the fans work. So maybe you have an electrical gremlin interfering with a couple things, brakes/ABS/blinker and fans, and when the fans go out, so does the AC. I'd be more concerned about not having working blinkers or ABS or lights than a working AC for safety reasons. Since you say slapping on the brakes causes things to work again, if only for a short while, you may want to take a look at your battery connections and terminals, make sure none are loose. Also check wiring harness for any loose connections or frayed opens that might be causing a loss of power to any components if they shift around. Again, the AC will not run or be cold if the radiator fans stop.

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