Heater and A/C Problems

Does your air conditioning blow warm? Does the heater stay cold? Is the drivers side dash vent temperature different from the passenger side temperature on A/C or heat? Read these articles.

There is a tiny hole in my 2007 model ford fiesta's coolant expansion tank. I closed it with an epoxy and everything is fine. I drive car and there is no decrease in coolant level, the problem started when i switch ON the AC.

If the freon charge is good, and the compressor WILL engage and stay on, but the dash vents still blow warm air from all vents, then the air delivery system needs to be checked next.

Depending on the vehicle, there are several doors, actuators and motors that direct the incoming air over the A/C evaporator to cool the air. Any number of problems can cause the air to either be warm, or just a little cool.

The most common thing to cause the A/C system blow warm or cool-not cold air is that the freon charge is low.

Compressed refrigerant from the compressor enters the condenser in a high temperature, high pressure vapor state. As the refrigerant flows through the condenser, the heat of the refrigerant is transferred to the ambient air passing through the condenser.

Drivers Side Blows Cold, Passenger Warm - Or Vise Versa

Most of today's cars and trucks have the ability to blow different air temperatures form the drivers and passenger side. Even if you do not have dual-zone controls, there still may be two separate doors and motors to control the side separately.

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How Things Work

Evaporative Emission System Operation and Components

The Evaporative Emission (EVAP) control system limits the fuel vapors from escaping into the atmosphere. The EVAP transfers the fuel vapors from the sealed fuel tank to an activated carbon (charcoal) storage device (EVAP canister). The EVAP canister stores the vapors until the engine is able to use the extra fuel vapor. When the engine is able to use the extra fuel vapor,

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Common Engine Codes

Idle Air Control Valve Engine Light Codes

P0506 - P0507
The idle air control (IAC) valve is located in the throttle body of the SFI systems. The IAC consists of a movable pintle, driven by a gear attached to an electric motor called a stepper motor. The IAC valve motor is a two phase bi-polar permanent magnet stepper motor that is capable of highly accurate rotation, or movement, every time the polarity of a winding is changed.

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