Q: My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air.

asked by on June 24, 2017

My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air. What is wrong with it?

My car has 165 miles.
My car has an automatic transmission.

AC is not working Inspection $96.46 - $116.46 Get a Quote

When the car is moving, versus stopped, there is more air flow over the condenser (the heat exchanger in front of the radiator) and that airflow is essential to system operation. To maintain airflow when the car is in stop and go traffic, or is completely stopped, condenser fans will come on automatically. If the fans don’t come on, the circumstance you have could occur. You might also have a low state of refrigerant charge. Other possibilities are that the compressor clutch is not cycling as intended or that the condenser might be blocked or dirty. And, of course, you could have a combination of these issues. To get this resolved, the best thing to do is request an air conditioning system inspection. The responding certified mechanic will come to your location, pinpoint the fault and get this resolved for you. Once diagnosed, the mechanic will be in a position to give you a repair strategy to get the A/C system fully functioning and he or she will estimate the cost of the required repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

The engine loses power after a longer drive

It is possible that your fuel pump would be getting weak. Often times if the fuel level is run low many times, this can cause the fuel pump to overheat. If the fuel pump overheats, this can cause it...

Heater blows luke warm air.

The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower...

name of 2 small hoses 3/8" that run to the bottom of radiator from engine?

The two hoses are the transmission oil cooler lines that run from transmission steel lines to the radiator oil cooler connections. They need to be high pressure power steering type hoses to hold transmission pressures.

The computer (ECM) says it's EGR flow and there is no other symptoms. What you think is the problem?

Either the EGR (Exhaust Gas Recirculation) valve is stuck in the open position or is closed and not opening. First try removing the EGR valve and cleaning it out. Then see if the engine light goes out after cleaning the...

Temperature gauge on dashboard

If by replacing the "temperature valve" you are referring to the thermostat (which does in fact act as a valve in a way), then you might have an electrical issue. Assuming with the repairs you have done, that the cooling...

my truck feels like the rearend is going out

Hi There, If the brakes have been confirmed not to be the issue, I would recommend having the axle inspected by a qualified professional. This would likely involve removing the fill plug to the differential to see if the fluid...

Check fuel cap warning flashes, car shuts off

Hello there, in most cases the check fuel cap warning and the vehicle shutting off are not related. The check fuel cap light is shown due to the a leak detected in the EVAP system. When leaks like this occur,...

Dying at idle

Hi There, It sounds like you may have a dirty or faulty idle air control valve. The idle air control valve is a small valve on the engine's intake system that reads the air intake as it comes into the...

EGG code p0400, multiple cylinder misfire, removed and cleaned egr and pipe with no change

Hi there. The P0400 EGR (exhaust gas recirculation) valve code may not be a valve not working. This code description is a EGR flow malfunction. The fact that your vehicle has multiple cylinder misfires leads me to believe the valve...

Related articles

Isuzu Certified Pre-Owned (CPO) Car Program
Drivers Drivers who have been shopping for a used Isuzu vehicle may have already considered a Certified Pre-Owned, or CPO, vehicle. CPO programs allow owners of used cars to drive with confidence, knowing that their vehicle has been inspected and...
Understanding the Isuzu Oil Life Monitor System and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Isuzu Oil Life Monitor system indicates when and what service your car needs.
Symptoms of a Bad or Failing Thermo Coolant Fan Switch
Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.