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to convert from r12 to r 134 a the entire system has to be changed
that is condensor, compressor, evaporator, hoses ,the lot because r134a runs at much higher pressures than r12 ( nearly 3 times higher in psi)
it needs different gauges and has different fill connections so that the gasses cannot be mixed
to make it worse the oil used in the compressor is different because of the different gas and is not compatible with the r12
there was nothing wrong with r12 gas but companies and customers were "hoodwinked" into believing that the r12 was bad for the atmosphere and r134a was the answer
just as you have been " hoodwinked" by the person into getting a gas change over without being fully informed of what was involved and why
with r134a gas there has to be a fan in front of the condenser that works immediately the ac is switched on as the temp of the gas being converted back to liquid is much higher because of the higher pressure need to convert it back from gas to liquid
without that fan the system starts to circulate gas and so the evaporation of the liquid at the evaporator in the car is lost and no heat from the car is transferred back outside
what it means is this --- if you can get r12 gas , change the compressor back to an r12 compressor, have the system completely flushed, vacuumed down for at least 1/2 hour and then refill with r12
If on the other hand you have to use r134a because that is the only compatible compressor available then the evaporator , hoses and condenser have to be changed as well and that means a new ac kit basically
find yourself an accredited ac specialist shops and get quotes
Your airconditioning system may be out of cooling gas, and if it has sufficient gas, the compressor might not pick when you put on the AC, and if the compressor did not pick ie start, you cant experience cooling effect, the fan will only be blowing.
Start the car and turn on the AC to max. Do either of the fans run with the AC compressor engaged? Also, there is a temp sensor for the fan circuit but I don't know exactly where it is located on that vehicle.
Make sure your fan clutch is working. No fan, no cooling of the condenser, no heat dissipation, no cold air. Start the truck and make sure you feel air movement, a lot.
Normal, the ac heat exchanger condenser need air moving across the fins to remove the heat. While
moving in town the condenser isn't remove the meat that is building up the it's
aluminum fins. Even though the vehicle uses an electric fan. The fan is used to
cool the engine temperature. If you Toyota is equip-ed with automatic
transmission. The electric fan will need to pull enough air to cool the engine
temperature, automatic transmission fluid, air conditioner condenser, and maybe
power steering condenser to cool the power steering fluid. Later model of
vehicles/trucks are using different refrigerants instead R134A in which you
Toyota uses.
The simples way to explain is the ac remove heat from inside your Toyota and this heat is removed by the refrigerants inside your ac in the car. To cool the refrigerant this coolant is removed to the heat exchanger condenser located in front of the engine radiator. So, while moving at 60mph there is enough air flow through the radiator, ac head condenser, and other aluminum heat exchangers. GB...stewbison
Most cars have an 2 electric fans on the radiator. One will run when the coolant gets hot and the other will run when there is more cooling demand OR it will run when the AC is turned on. My guess is, the second fan is not running when your AC is. Your AC system creates heat of its own. The heat is removed through the condenser (radiator-like coil) which is usually located in front of your engine radiator. Without a fan the heat is transferred into your engine radiator causing it to over heat. This would explain why it overheats while idlling and not while driving. While driving, air is flowing through the radiator and condenser. to provide the necessary cooling. In short, check to see if both fans are running when the engine is hot and the AC is turned on.
It might and it might not matter. It depends on EXACTLY which car you are getting the fan out of. Some may interchange and some won't. Then you have the problem of not knowing if the fan that you "pick" is even any good. It could be all rusty inside the motor from being out in the weather. Most of the cars at the salvage yards do not have any hoods to protect electrical devices from the weather.
Why don't you just buy a NEW fan motor that you KNOW will fit your car? It is available at AutoZone for only $24.99 - probably less than the trip to the salvage yard!
AZ Part number PM517
The condenser in front of the radiator puts off a lot of heat when in use. If the coolant level and specific gravity is correct, the radiator needs to be checked for sufficient flow. Being almost 12 yrs old there is probably a lot of build up in the core.
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