My car air condition doesn't work when driving in city traffic but cools really well on the highway. It appears that it has too much pressure, according to my brother. He let out all the freon and apparently it had too much pressure, and then put two cans but the problem persists. He has bypassed the high pressure (?) valve but it hasn't helped much. He says is going to be a process of elimination and we are trying to find a copy of the air conditioning system schematics but since it costs money we are trying to get them for free at the library by using ALLDATA but the internet at the library is so slow I havent had time to get to that section successfully yet.
EmaMy car air condition doesn't work when driving in city traffic but cools really well on the highway. It appears that it has too much pressure, according to my brother. He let out all the freon and apparently it had too much pressure, and then put two cans but the problem persists. He has bypassed the high pressure (?) valve but it hasn't helped much. He says is going to be a process of elimination and we are trying to find a copy of the air conditioning system schematics but since it costs money we are trying to get them for free at the library by using ALLDATA but the internet at the library is so slow I havent had time to get to that section successfully yet.
Ema
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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
Check to make sure the cooling fan is kicking on it is mounted to the back of the radiator once the car gets up to temp it should kick on to coll the radiator when you are sitting in traffic on some cars if you turn the ac on the computer will automatically switch the cooling fan on
Either clutch coil is heating up and letting go Or one of the sensors is defective. Or there is a restriction somewhere in the line (open up hood and look for frost on a/c lines.)
At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.
Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.
If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?
It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.
Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.
Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..
The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.
The humming is the noise the coolant makes when the car overheats and forces open the relief valve in the radiator cap and flows through the small hose to the recovery bottle., it you had all this work this done only 2 things can cause the issue, one is a problem with the cooling fan, the other is a blown head gasket, which I suspect is the problem, before you flushed the system was the coolant rusted?
if ac dont work idleling it start to work when you move our fan is not coming on because when you activate the ac compressor kick in and fan should come on if it start to be cold only when you drive the force air cool the condensor ac work temp goes down HOPE IT HELP FIXYA OUR POST THANKS . PIERRE
My car air condition doesn't work when driving in city traffic but cools really well on the highway. It appears that it has too much pressure, according to my brother. He let out all the freon and apparently it had too much pressure, and then put two cans but the problem persists. He has bypassed the high pressure (?) valve but it hasn't helped much. He says is going to be a process of elimination and we are trying to find a copy of the air conditioning system schematics but since it costs money we are trying to get them for free at the library by using ALLDATA but the internet at the library is so slow I havent had time to get to that section successfully yet.
Ema
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