Q: My air is blowing cold-hot-cold-hot-cold-hot...

asked by on August 13, 2016

My air was not blowing as cold as it used to, so we put some coolant in. After that, it blew colder for about 2 hours and then it started blowing hot. Then it blew cool again, and then hot. It mostly blows warm air now, as if it does not work, but once in a while, it will blow cold air for about 5 seconds.

My car has 68000 miles.
My car has an automatic transmission.

Coolant is leaking Inspection $79.99 - $89.99 Get a Quote
AC is not working Inspection $96.46 - $106.46 Get a Quote

It is possible that you have a leak in the AC system. There are pressure switches that will turn off the compressor if the pressure is too high or too low. The low refrigerant level could cause the AC compressor to cycle on and off. If you would like to have this done, a certified technician from YourMechanic can come to your car’s location to diagnose the AC system and make the correct repair.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Broken timing belt

Installing a new engine will obviously solve the problems related to the timing belt damage. As for the question of more problems, this is not really something that can be guaranteed, although I would recommend checking into the warranty on...

Reliability of Datsun Nissan 240z

I was just working on one the other day. They are fun and reliable if they are not very old and worn out with high mileage. My customer only got 69,000 miles on his so it's still fun and reliable....

No heat,defrost or air coming from front a/c vents

Hello - there a couple of possibilities here for this problem: the blower motor resistor pack, or the fan switch portion of the HVAC control itself. The blower motor resistor pack regulates fan speed in the Low or Medium positions,...

What would make my check engine light come on this much?

Without specific information about your engine size and which engine codes have previously been reset, it is difficult to thoroughly diagnose the problem. Using the 3.6L engine as a reference, I found that this engine may have issues with random...

Brake light issue

The rear brake light on the right uses the same power as the one on the left. If you are getting brake lights on the left side but not on the right, then you will need to test the right...

how much damage to engine after driving after serpentine belt broke?

Hi there. I'll be transparent with you, there is no way for me to determine the extent of the damage or what it may cost without performing an inspection on the vehicle. During the last service were you provided with...

Hi. How do you reset the limp home mode in a manual shift?

The check engine light means there is a problem in the computer system that need to have a scanner to retrieve the codes stored in memory. Once the codes are retrieved you can have the codes pinpoint test done to...

Bypassed my heater core and refilled my reservoir tank for coolant checked it after two days it's getting low again

I can't help but think that there is a little more back-story here. But I presume you bypassed the heater core because you had a leak inside the car. That's something you can do if you don't need heat of...

car is misfiring and vibrating

In older, points-style distributor systems, the spark plugs and ignition coils were the primary source of engine stumbling and hesitation. However, in newer, electronic ignition systems like your 2011 Versa, the primary source is either bad sensors or clogged fuel...

Related articles

4 Essential Things You Should Know About the Heating and Air Conditioning System in Your Car
When When you get into your vehicle, you simply expect the air conditioner or the heater to work when you need them. When something goes wrong with these systems, it can make driving unbearable in some climates. Consider the following...
Symptoms of a Bad or Failing AC Belt
If your car squeals when you turn on the AC, has cracks in the AC belt, or is unable to defrost the windshield, you may need to replace the AC belt.
Why Does the Air Coming Through My A/C Vents Smell Bad?
Over time your car A/C system can start to smell unpleasant. If your A/C system smells bad check for mildew in the vents or install a new air filter.