Question about Hyundai Cars & Trucks
If you're talking about the variable speed fan, it's controlled by the heater control head and a field effect transistor mounted on the heater box. The FET pulses the blower motor circuit to vary blower speed.
Posted on Aug 10, 2017
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Posted on Jan 02, 2017
replace the blower motor speed control module, that is the only cause of this problem that I know of, and u are about the 20 post for this issue that I have read, it has fixed the other ones..
Posted on Feb 26, 2009
The module is located in the ducting for the heater and is accessed from the passenger area of the front seat. I think it is just under the dash but you may have to remove the glove box. it is a rectangular item held in with four screws. and should have two connectors going to it. You have to be sure to get the right replacement if you r replacing it.
Posted on Feb 26, 2009
should be on the passenger side under the dash. Remove the lower dash panel and look up under the dash. you will see the blower motor and then to the left a little you will see a plug attached to a relay/resistor switch. It is held on by two screws. The Envoy is the Trailblazers sister so you may have the same issue I had. Seems like the ground is not sufficient enough causing the ground wire to get hot melting the plugs together. I had a very hard time getting them apart but did. Purchased a new relay/resistor switch and repaired the wiring myself. GM wants $100.00 bucks for the plug. Hopefully you don't have a G/F or wife like mine that thought kicking the fan speed control switch would make it work. I had to also replace that due to her breaking the switch.
Posted on Aug 16, 2009
Your problem is the Relay which is encased inside the Heater/AC Resistor Module. This is a very common problem with GMC and Chevy Trucks. The Relay's return spring fails and the relay is held closed by gravity. The only fix is to replace the Resistor Module. I have a 2004 Silverado and have replaced the Module 3 times and the Blower Motor twice. The Orange wire feeding the Module is always Hot (12V) and feeds the Relay Contact for Highest Blower Speed. Hence the Blower runs all the time even with the Key off and removed.
Posted on Oct 21, 2009
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