Why is my AC blowing warm to very warm air?


Asked by Aug 31, 2017 at 03:06 AM about the 2008 Toyota Yaris Base

Question type: Maintenance & Repair

I had no problem with my AC until now - all of a
sudden it is blowing warm air.

Here is what I did before this started:
Water pumped was making a 'struggling' noise, one
thread of the serpentine belt tore - stopped the car
ordered parts > replaced successfully ran the car a
couple of days > no problems at all, AC running just
fine (only not freezing cold like I would want it to,
but cold nevertheless ).
On Monday I decided to give it a radiator flush and
an oil changed . Drained radiator coolant, filled with
radiator flush solution mixed with water ( as
recommended on bottle from PepBoys), ran a few
hours (AC still working) , drained the cleaning
solution, filled with Toyota recommended 50/50
coolant (AC STILL WORKING) .
Last night on Tuesday decided to buy a bottle of the
AC PRO for my other car, and used up probably 3/4
of the bottle, so I put the rest in my Yaris (pressure
was showing in the green,ran the car a few minutes
AC is still working.
Took the car this Wednesday mornings by to work,
AC so cold I turned it off and 'rolled' down the
When I got off after a long hot day I turn on the car
to go home turned on AC and BAM!, all that was
combing out of the vents was only hot air !!!

The dashboard doesn't show me anything wrong,
the OBDCarDoctor device attached to the car's
computer doesn't give any error codes, temperature
of the engine is normal (between 190 and 203)....

Car has 107184 miles driven.

What is wrong with the darn AC?

Please help !

5 Answers


This is so weird! I just took the car of the freeway (no traffic) the AC WAS BLOWING cold air, BUT as soon as I exited, when I got at the stop light the cold air was no more, I started driving the air got colder, I pulled in the parking lot and left engine on with AC turned on cold air DISSAPEARED AGAIN! What does this mean?

2 people found this helpful.

You are short of refrigerant, go to auto zone and purchase A/C PRO with the gauge. this is the easiest one to use on the market follow the instructions and you should be good to go...

2 people found this helpful.

So even though I put a little bit that was left in the can from my other car, and even though it actually comes and goes as I drive do you think it might be something else or do you have no doubt it's just because I am low on refrigerant?

2 people found this helpful.

I bet this will definitely diagnose my issue: if it's not super hot outside and if I keep it on the lowest setting (1 of 4) the cold air comes out just fine !!! As soon asnis hot OR turn it to setting 2 > no more cold air! Does that still mean it's the amount of the freon left in th system ?

2 people found this helpful.

Its a Toyota yaris

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