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If your EC light is on and will not turn off, it means you are probably low on refrigerant, R134a. The EC lights keeps the a/c compressor clutch off for 'economy' mode, helps save gas while your driving, but if you can not turn it off, its telling you the refrigerant is low and there maybe a leak.
First off, it does not contain Freon. Freon is R12 and your Hummer contains R134a which is not Freon. This is not a DIY job. If it is low of refrigerant then it has a leak, and it is illegal to add refrigerant without repairing the leak. I suggest you take the vehicle to a professional that has the expertise and special tools to accomplish this repair.
Lighter, as the refrigerant is boiled off, and colder, as it has absorbed heat, and has a lesser pressure to reflect the current temperature / pressure relationship for the type of refrigerant
1.75 pounds First off, it does not take freon as that name refers to R12, is band from production in the States. Second, R134A is required for use in todays automobiles. R134A is to be measured exactly, meaning if it calls for 14 ounces that is what it means. You will be best off at a certified repair shop.
Lighter, as the refrigerant is boiled off, and colder, as it has absorbed heat, and has a lesser pressure to reflect the current temperature / pressure relationship for the type of refrigerant
Read the certification labels underhood-- they state the refrigerant type and volume. It should be fitted with R134A from the factory and thus easily recharged. Check for leaks. Prior to anything else, with the engine off, rotate the compressor pulley by hand to be sure it is freely turning.
The condenser is a coil in a refrigeration system. It is on the low pressure side and is exposed to ambient air temp. The refrigerant goes through that and is cooled off and is then sent to the compressor.
It is normal for it to cycle on and off. If, however it is cycling on and off rapidly then your system has a leak and is low of refrigerant. Have the leak repaired and the system recharged by a professional.
First off if it is low of refrigerant then it has a leak. It is illegal to add refrigerant to a A/C system without first repairing the leak. You have neither the tools nor the skill to repair the leak, and to add the correct amount of refrigerant. Take it to a professional shop with the proper equipment and knowledge to repair the system correctly.
Have the refrigerant level in the A/C system checked. Rapid cycling of the compressor can be one of the signs that your refrigerant level is low.
If you want to take the condensor off, you need a refrigerant recovery system.
You need to have your system checked out as it could be low on refrigerant Check your filter.