So our 2014 Hyundai Tucson (GDi) cooling fan doesn't seem to come on when it's hot or when the ac is on. The ac only blows cold when the car is moving and the car sometimes overheats when idling. I had a can of AC Pro on hand that has a pressure gauge on the low side. The pressure read High when I connected the AC Pro and ran the AC so I DID NOT put any freon in. That's also when I noticed that the fan was not running.

I looked at the C/FAN Hi relay and it did not have any corrosion on the terminals or heating. The relay tests good both the solenoid and the switching. There is power to the relay solenoid when the AC is running. There is no power to the switched contacts for that relay. The fan motor runs if I supply it power.

Any ideas of what I can check??

Is there a separate engine compartment condenser fan relay other than the relays listed on this diagram?

PS: The ac system is constantly cycling the compressor on 10 seconds off 30 seconds.

Fuse box diagram


  • 1
    If there's another relay in there which is like the hi/fan one, exchange it and see if it runs. – Pᴀᴜʟsᴛᴇʀ2 May 20 '19 at 20:41
  • Thanks for the tip ... I'll check it out @Paulster2 – 3dalliance May 21 '19 at 15:46
  • does the tucson have 2 fans or just 1? the lo/hi relays are leading me to think its a 2 fan setup. Just because the relay passes a visual inspection doesn't mean it actually works – Zshoulders May 23 '19 at 18:53
  • The C/fan Relays Hi & lo are different amp rated relays so I can't swap them. There is only one fan for the radiator and condenser combined. I think I'll start a bounty. – 3dalliance May 28 '19 at 12:35
  • You can always do one of two things to check the fan. First way is to pull the fan relay and jump the terminals with a wire. If it kicks in, the relay is bad. You might want to check the socket to ensure there's power to it. Secondly, you could also try pulling the wiring for the fan itself and supplying power directly. If it runs there, you know the fan is good. If it doesn't in either case, you have your culprit. You can also jump the relay directly to ensure it is clicking, then check for continuity on the other side. – Pᴀᴜʟsᴛᴇʀ2 May 29 '19 at 23:12

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