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

Engine Coolant System | Water Pump Radiator Thermostat Heater Core

The cooling system's function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system is designed to remove approximately one-third of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the system cools slowly or not at all. This allows the engine to warm quickly.

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Common Engine Codes

Oxygen Sensor Code P0130 - P0141

The powertrain control module (PCM) supplies a bias voltage of about 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the HO2S low reference circuit. When measured with a 10 mega ohm digital voltmeter, this may display as low as 350 mV. The oxygen sensor signal varies from about 800 mV when the exhaust is rich, to about 50 mV when the exhaust is lean.

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