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Re: they tell me I need a coolant temperature sensor
You might have 2 coolant sensors one for the gauge and one for pcm, and if you stop by a part store like autozone they will give you a print out of locations of one or both. did they tell you that you only had one ? ask the part store how many they are showing for your car when you go they will tell you. then find out which one they want you to replace
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My online Sonata manual shows these possibilities, but does not identify which applies specifically to 2000 Sonata. Also, when you talk to the dealership parts counter, you'll need to know whether your 2000 Sonata is (a) 4-cylinder 2.4L MFI DOHC engine, or (b) 6-cylinder 2.5L MFI DOHC engine. Its easy to tell - just count your spark plug wires.
-- begine excerpt from 2000 Hyundai Sonata Repair guide --
The crankshaft position sensor is located next to the flywheel. The crankshaft position sensor is located next to the flywheel/torque converter. The camshaft position sensor is located on the engine near the timing belt cover and under the upper radiator hose. The crankshaft position sensor is located on the driver-s side of the vehicle, down by the lower radiator hose. The crankshaft position sensor is located on the engine near the crankshaft pulley. The crankshaft position sensor is located at the front of the engine near the timing belt.
--- end excerpt from 2000 Hyundai Sonata repai guide ---
It needs to be diagnosed. It's normal for the AC to shut down when the engine overheats. The engine computer (called the ECU - Engine Control Unit) monitors the coolant temperature by means of a coolant temperature sensor (cts). When this sensor tells the computer the engine is too hot (above 230 to 240 degrees), the ECU turns off the AC compressor and the cooling system fans go to MAXIMUM (HIGH) speed. By the way, there are two engine/coolant temp sensors - one for the instrument gauges, the other for the ECU. If this sensor is malfunctioning, it can cause the symptom you describe - BUT that needs to be verified. Best solution, take it back into the mechanics/technicians and have them determine if that's all this is, because if it isn't, something else could be seriously wrong (clogged radiator, malfunctioning water pump, bad thermostat (even though it's new (or maybe it didn't actually get replaced), and there's a slew of other possible causes.. leaking head gasket for one. Best have the professionals (if they are professional) diagnose it.
I had a similar problem with my 1995 Sonata... turns out, the coolant temperature sensor had gone bad and was telling the ECU (Engine Control Unit) that the engine coolant temperature was at minus (-) 40 degrees. The ECU then INCREASED the fuel to air ratio and the engine wouldn't start because the ACTUAL temperature was like 195 degrees F. - same as flooding the engine with excess fuel. There's also a MAF (Mass Air Flow) sensor which could be malfunctioning (telling the ECU that LESS air is coming in than ACTUALLY is .. OR the REVERSE). It seems to me your hyundai mechanic (supposidly TECHNICIAN) isn't a technician/mechanic at all.... sorry,, forgive me. I'm a 'PLATINUM' certified Hyundai Tech... The diagnostic procedure for solving your problem is exact and precise... he/she doesn't know what he/she is doing. Oh, there's also a possibility the TPS (Throttle Position Sensor) may be contributing to the problem. The 30 mins to 1 hr delay points to the coolant temp sensor.