Question about Hyundai Motor 1999 Elantra

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A/C and Cooling Fans not working on my 1999 Hyundai Elantra

My car ran hot and the A/C stopped working , I believe at the same time. We discovered the radiator was cracked and have replaced it with a new one. We also replaced the ECT sensor, all the hoses, and the thermostat. We have checked the relays with an ohm meter and they appear to be o.k. We started the car back up and let it idle and once again it's beginning to run hot and neither fan is coming on. We also checked the fans by wiiring them directly to the battery and they worked.

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  • dudleigh03 Dec 03, 2008

    i believe that sensor is called the ect sensor and i have already replaced that and still not working any other suggestions are deeply appreciated i need a diagram on the wiring for it

  • drp58 Dec 21, 2008

    I replaced both coolant temperature switches and checked the relays and the fans do not come on. When I turn on the A/C fan switch on the console they both come on. The fan does not kick on as the temperature rises to hot. Something is not telling the fans to come on automatically. What else can I try?

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  • 64 Answers

Sounds like the cooling fan sensor is bad

Posted on Dec 03, 2008

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Hyundai Elantra temperature goes up to HI when air is turned on


There is an electric fan that should come on with the AC and run whenever the AC is on,if it doesn't come on it will heat up very quickly. Sounds like a problem with that radiator mounted fan.
The fan is supposed to come on when the engine gets hot enough also.
If so, the AC should be ok at hiway speeds.But you need the fan to work.

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How do I flush the cooling system in a 2000 hyundai elantra?


There are several methods for flushing the cooling system on ALL engine cooling systems. Time honored is drain the radiator (drain ****). Fill with fresh water and run engine to operating temperature until cooling fans turn on. Drain cooling system again. Refill with 50-50 coolant. Another method is purchasing a "T" vlave (coolant flush/service kit) from Autozone, PepBoys, NAPA, O'Reilys, CarQuest, etc.). This "T" valve is installed in one of the heater hoses & attached to a garden hose. Remove the radiator cap & turn on the water supply to the garden hose. Let water run until flush water is 'clear'. Remove garden hose from T valve & refill radiator with pure coolant until the T valve drainage turns green/orange. Install T valve cap... DONE!

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2 Answers

My 2000 hyundai elantra is overheating..when i turn the ac on only one fan comes on the other doesnt


COOLING FANS NOT RUNNING

It is normal for the A/C air to warm up a little when stopped. Less airflow thru the condensor. It is normal for the engine temperature gage to rise up to about the 80% mark on its scale before the cooling fan kicks on. The gage will also show about the same reading on the first start of the day, until the thermostat opens.

If the fan(s) are not working properly the A/C air and engine temperature will rise. If you have a belt driven clutch fan, the clutch may be worn out. All cooling fans kinda sound like miniature jet engines when its hot out, more so when the A/C is on. Replacing the clutch is all you can do for a belt driven fan. Electric fans are more complicated....
Check all main power electrical connections first.... Electric Fan(s) not working, Checking the fan(s), relay, fuse and engine temperature sensor's.
Verify that the fans work by unplugging them and run jumper wires to the fan(s) from the battery. If they run, your problem lies elsewhere. If either does not run, it's the motor.
Next thing to check is for power at the fan connectors. You have to be cautious doing this because the engine needs to be running and warm if not almost hot, and the A/C also needs to be on. (Both must be on and running for the duration of this checklist.) The A/C fan is on the passenger side and should come on almost the instant the A/C is turned on. It is also the secondary engine cooling fan and should cycle on and off in relation to engine temperature. Use a test light to probe the two wires on each fan. If you find power the fan motor(s) is/are probably bad. If there is no power to fans, roll up your sleeves!

The temperature switch is usually located above the oil filter. If the dash gage is working, its probably OK. Next is the Fan Control Temperature Sensor, located IN or CLOSE to the thermostat housing. You will find out if it is working later is this checklist. I just wanted you to know where it is. Next is the relays and fuse's. Usually located in the engine compartment on the passenger side power distribution box. You will need to remove anything over the cover to open it. If the fuses are OK, tap on the relays or pull them out and push back in. If the fans are still not running, pull a relay and probe the socket terminals for power. Two or three of the terminals should have power, usually criss-cross from each other. Two are hot battery power, and the third is the "signal" voltage which triggers the relay to send 12V battery power to the fan. This signal voltage comes from the sensor at the thermostat. If only two terminal's have power, then I would replace the thermostat sensor if not both sensors.

Hope this is clear as mud! and helps! Please let me know what you find.

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1 Answer

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You describe a typical 'cooling fan' problem. When moving through the air, the AC operates normally, but when stopped in traffic, it doesn't... correct?

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your electric fan for the AC is not working for whatever reason so when idles its all getting hot the engine and the AC system .This sort of work can be difficult to diagnose correctly and a code reader is about as good as a bible at mosque so seek the advice of a skilled mechanic who should be able to pin point the fault in seconds

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1 Answer

Timing belt went out on 1999 hyundai elantra


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1 Answer

Heater quit working 2001 Hyundai Elantra. Checked


If the heater is blowing cold air, it could be your thermostat. They cost $20-50 at an auto parts store. Also, after the car has been ran for awhile does it come up and stay at normal operating temperature? Is your coolant level normal? If the car is high in mileage and the cooling system has never beeen flushed, it may just need flushed.

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1 Answer

My engine is getting real loud...the temo guage


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