Skip the auto shop - Our mechanics make house calls

Q: I poured antifreeze in my car and it's still blowing out cold air when I turn the heater on

asked by on

I'm trying to use my heater and I noticed my temperature gauge was more than half so I put antifreeze in it, now it's fluctuating. Why isn't my a/c blowing heat?
Now it's in park and the temperature is at the halfway mark

My car has 110000 miles.
My car has an automatic transmission.

Hello. There are a couple of things to check here. When the antifreeze was added, was the cooling system thoroughly bled (with the heater turned to "Max" heat and fan? There could be air bubbles in the engine or heater core - which don’t transfer heat.

You mention the temperature at the gauge is "fluctuating". A properly working thermostat should keep the temperature steady at the middle of the gauge. It’s also possible your heater control valve is malfunctioning, not allowing hot coolant into the heater core.

I would recommend having an expert inspect the heating system in order to pinpoint the correct repairs for your situation.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • I poured antifreeze in my car and it's still blowing out cold air when I turn the heater on

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

Get a quote

What others are asking

Q: 2006 Pontiac Solstice starter replacement.

Hi there. The cost of replacing a starter varies on which shop you take your vehicle to. Each shop has a different hourly rate and a different plan like adding a diagnosis with the replacement. The price that you have...

Q: My 1999 BMW blower comes on whenever I put keys in the switch and turn the motor on.

Hi there, thanks for writing in. If this comes on right when the car is turned on, then most of the time it is caused by a bad blower resistor module. This module fails internally and causes this to occur....

Q: My car starts to run hot if I cannot maintain a consistent speed where air is moving across the engine.

Hey there, your car has an electric cooling fan. It should start automatically when the engine gets to a certain temperature or when you switch the A/C is on. In hot weather with the A/C on, the fan should switch...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...