Defogger relay
 

Hi all, I have a problem with my front & rear defoggers on 2005 Santa Fe CRDi 2.0.
At tickover, the switch will not activate the defoggers & there is a 'clcik' in the dashboard but at 1500 rpm, they will turn on (front & rear). As I accelerate/decelerate they switch off if the rpm varies by more than 150 rpm either way. The will work for a small rpm range at intervals of approx. 1000rpm (1500, 2500 etc). I visited a car centre & they advised, to check the relay. I've looked in the manual & I'm struggling to find it. Does anyone know where the relayis, or have any ideas what the cause of this problem may be?
Any help would be greatly appreciated.
Paul :D

First things first, the front and rear defroster are 2 different things. The rear is an electric element on the rear glass that heats up the defrost the window. The front defroster (technically a defogger) uses the vents to blow warmed air on the windshield to defog/defrost the glass.

Now, if you hear clicking, what you are hearing is the relays clicking on and off. So the problem is probably elsewhere.

Having said that, I had a similar issue in my 2006 Tucson where the blower motor for the HVAC system would go on and off while I drove. The problem turned out to be the control unit assembly for the entire HVAC system. That's where I would start.

Read these threads:
https://www.hyundaiforum.com/forum/h...midently-7856/
https://www.hyundaiforum.com/forum/h...working-11687/

Hi NovaResource, I think we have slightly crossed wires here. The Santa Fe has a front electric element defog but it is only a thin strip designed to de-ice the wiper blade.
The blowers all work fine, along with the air con. My problem is purely the heated elements. The local car centre I visited, was a alternnator specialist, who admitted they were not auto electricians. I visited them because I have my battery light on, even though the alternator is inly 6 months old & was advised, this was a blown diode in the alternator. I was suspecting the battery light & defogging problems were linked, but, the alternator centre dimissed this.
Thanks for your response.
Paul