Question about 2003 Chrysler Sebring

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My check engine light came on after i put freon in the car for the air condition. my friend has a computer that we hooked up to the car to find out what the problem was and this code came up P1490, what does the P1490 code mean on a 2001 chrylser sebring lxi, 2.7 4 door sedan?

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When you get that code it means that the computer isn't detecting the relay kicking in and starting the cooling fan.
In most cases replacing the relay for the fan will cure that problem and you can erase the code with scanner once the problem is repaired
P1490 Low Speed Fan CTRL Relay Circuit - you need to check and make sure the cooling fan is coming on when it suppose to.

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Posted on Sep 05, 2010

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Low Speed Fan CTRL Relay Circuit

you might try disconnecting the battery, turn the key to "start", turn off then re-connect the battery to clear the memory and see if it returns, then if it does, I would look at the blower motor resistor.

Posted on Sep 05, 2010

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Low speed fan control relay circuit

You can try to clear the code, and drive on. If the light reappears replace the ceramic looking piece located about 4 inches from the fan plug in, clear the code and you should be good to go.

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Posted on Sep 05, 2010

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2009 Buick Lucerne Air conditioning - How do I charge the system when there is no freon in it? The compressor will not come on.


Just because the A/C compressor doesn't come on ,doesn't mean it needs refrigerant . Test the system electrical circuits . hook up A/C gauges , hook up a scan tool an check for codes , check to see if the PCM - engine computer , energize's the A/C compressor clutch relay .
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Air conditioning not too cold ??


Hello,
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Let me explain in layman's terms how the air conditioning (AC) system works and what could be happening to your car.

Like your body, the air conditioning compressor is the heart of the AC system, and Freon is the blood. The compressor pumps Freon throughout the AC system, either the older type R12 which costs as much as gold it seems these days, or the new environmentally-friendly R134A Freon. This Freon is a gas and liquid combination that is compressed and circulated throughout the air conditioning system. The compressed Freon is pushed through the system under pressure and is passed through different sized metal and rubber hoses and a special valve called an expansion valve that cause the gas to expand and contract.

This expansion and contraction makes the Freon gas very cold. This cold gas makes its way via metal lines into the dash area of your vehicle to the evaporator core. This evaporator core is like a small radiator, except it has cold Freon circulating inside and not hot antifreeze. A small fan (the AC blower fan which you control from the control panel on the dash) sits in front of the evaporator core and blows air across this cold evaporator and then through the vents inside your vehicle.

The other objective of the air conditioning system is to remove the heat from inside the cab of the vehicle. This heat is removed by the Freon with the help of the AC condenser located at the front of the car (usually in front of the radiator). The Freon coming back from the evaporator carries the heat from the cab to the condenser via rubber and metal hoses. Just like your radiator, the condenser is lightweight aluminum with many internal winding coils.
The Freon travels through these coils, and in between these coils are small slits or fins that the Freon is forced through. The condenser will have an electric cooling fan mounted in front or behind it to push or pull air through these fins to remove the heat from the Freon. Some vehicles still use the old fashioned fan blade driven by the engine to pull air across the radiator and the condenser.
Now I know that is just a tidbit of information on how the air conditioning system works, and it is very general, but I wanted you to know what to look for to give you insight as to what might be happening with your vehicle.
A few causes of low cooling efficiency or no cooling at all at idle are:

Lack of air flow across the condenser. Make sure the electric cooling fan motor near the condenser is coming on, or in models that are equipped with a fan blade make sure this fan is turning and is turning very fast.

Low Freon levels. Freon level and pressure should be checked by your certified air conditioning mechanic.

Overheating. If the engine is running hot or overheating, it can have a noticeable negative affect on the air conditioning system. Some cars have two electric cooling fans, one for the air conditioning condenser and the other for the radiator. Make sure they are both working properly. Usually at idle on a hot day with the AC on both fans will be on.

When the vehicle is traveling at freeway speeds, the compressor is pumping the Freon throughout the system much faster and harder than at idle. There is a dramatic increase in air flow across the condenser due to 55 mph winds, and the engine is usually operating at a cooler, more efficient temperature as well, thus allowing the air conditioning system to operate efficiently.
Note: An air conditioning system that is somewhat low on Freon can still feel comfortable at freeway speeds due to the added air flow across the condenser which can overcome the ill effects of slightly low Freon. Periodic air conditioning performance checks by your mechanic are the best way to keep the system in great shape.

Hope this helps.

Goodluck

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