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There is a kit at walmart - -it is an install kit with 134A freon - purchase that kit and add one can until the AC blows real cold - -cheapest way to go.
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When you replace the fans do you validate that it runs when you switch on the aircon? some cars have alternating relay system that when one of it fails the fan will work when engine is hot but will not work when aircon is on. If all the engine cooling system and cooling fan electricals are fine then you may have to get your aircon system serviced. Particularly the radiator in front of the coolant radiator.
best talk to an a/con technican as there is a size/capacity requirement for compressors. While it may be feasable to fit another compressor it needs matching tx valve condensor and evaporator to work properly. He should be able to tell you if it will work or not
Full coolant level does not mean your engine cannot overheat. You need to fix the problem as overheating will destroy the engine if not addressed.
The radiator cooling fans must be working, as must the water pump. The thermostat must also be working properly. There must also be no air in the cooling system as air locks will impair water flow. When cooling systems are drained fully or partially and re-filled air in the system must be bled out using the correct bleeding procedure for the particular engine/cooling system. Failure to do this properly will lead to overheating.
If you ONLY see the overheating warning when running your aircon you need to check that the electric radaitor fans are kicking in at idle when you switch on and run the aircon and the engine has been warmed up some. If they do not start operating when the a/c is running you will get an overheating condition in normal driving conditions.
If the radiator fans are operating normally and you still get an overheating warning when the aircon is on or off the most likely culprit is a faulty thermostat in the engine's cooling system which will need to be replaced.
If you have either a faulty thermostat or if the water pump in the cooling system fails you will get continuous overheating whether the aircon is on or off.
The cooling fan should run continuously when the A/C is on. If it does then I suggest you drain and flush the cooling system, and replace the thermostat. Fill it with a fresh supply of a 50/50 mix of antifreeze and distilled water.
You have a leak most likely, and these are typically hard to spot without test equipment. Take it back to your technician and ask him to recharge the system and perform a dye test to locate the leak. Could be as simple as a bad o-ring in a fitting, or as complicated as a seal in the compressor.
If it blows thru other vents, your air ducts may have come loose. If you don't get any cool air, your coolant is low (it evaporates during the time and below some point it will not circulate anymore). Also the aircon blower can be faulty.
check for power at compressor clutch if power and earth there is ok new compressor required. no power there check relay and fuses swap air cond relay with another one that looks the same in under bonnet fuse and relay box
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