2004 Hyundai Elantra
My Temp Gauge seems to work but my fans are not coming on unless I turn on A/C (Passenger Side Fan only)
Turn off A/C and Passenger Side Fan stops.
Driver side fan does not come on.
A/C blows cold chronically (I am sure there is a pattern to the cold A/C and has something to do with the fans but just not sure)
If I rev the car to a constant 2,000 rpms, the rpms drops to around 1,200 rpms and then back to 2k rpms like a teeter tooter.
Can I rule out Coolant Senor since my Temp gauge seems to be working?
if that is ruled out, what is next. I have replaced Cond #2 relay

 

When you turn on the AC, it should turn on both fans.
If you disconnect the coolant temp sensor then it should turn on both fans
From what you describe, it sounds like there is a fault in the radiator fan
Check to see it get power and ground. If it does and still does not work then replace.
If it is not getting the power then check radiator relay and engine control relay.
Engine bay fuse box Fusible link B 20 amp and Fusible link G 30 amp.
The ECM should apply ground to turn on fan.

 

Thanks for fast reply. I will check that out.
Thanks again