Question about 2006 GMC Envoy

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Ac blower has no high speed changed resistor, can not find blower motor relay

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The relay is part of the resister, when you replaced he resister did you check the connector and make sure the connector was not melted if it is the you need to replace it.

Posted on May 23, 2011

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Posted on Jan 02, 2017

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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

1 Answer

My 1999 f250 blower motor only works on high


You probably need a blower motor resistor , it work's through a relay for high speed an resistors lower the speed for low , medium etc... Videos on youtube on how to test ! How to Install Replace Heater AC Fan Speed Resistor 99 07 Ford F250 F350...

Mar 16, 2017 | Ford F-250 Cars & Trucks

1 Answer

My fan motor was bllowiinghot only on high replaced the ac control module now doesnt blow at all. Is there a fuse or amplifier?


Hi Elaine , What make vehicle are you working on ? Most manufactures have a relay for hi speed an have a blower motor resistor for all other speeds . Depending on make vehicle control modules need programming in some cases . Blower Motor Problems Auto Repair Help

Nov 08, 2015 | AC Cars & Trucks

1 Answer

2004 Chevy Silverado 2500HD ac stopped blowing we changed motor and resistor and still nothing we have cold air running when u drive down road but no pressure


I'm going to assume you have the manual control version. The relay in the resistor allows the fan to run on high and bypass the resistor circuits. There is a 40amp blower fuse for high speed and a 30amp fuse for the other speeds. The motor is grounded thru the resistor.
Do you have power and ground at the motor on any of the settings ? ?

Jul 01, 2013 | Cars & Trucks

1 Answer

1995 GMC Sierra fan blower not working.


In the beginning you should check for voltage and ground.
The 50amp fuse marked AC powers the blower motor and the motor is grounded.
The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors.
You may need a shop manual or repair book to get the diagrams.

Jan 12, 2013 | 1995 GMC Sierra C1500

2 Answers

Ac relay for f150 fuse box diagrams ac clutch is not working been told its a relay...not sure where its at dont have owners manual


If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

The AC clutch solenoid is not in the fuse panel, not sure what relay is AC. There is a Blower motor relay, but this is only if the blower motor does not work in AC, vent or heat.
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There is also the Blower motor resistor, but this is usually the blower only works on high, the other speeds are not functioning
Blower Motor resistor ( and pigtail ) damaged
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Looking up under the glove box
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Jul 07, 2010 | 1998 Ford F150 Regular Cab

2 Answers

Heater Fan only works on high speed


Well you need to change the blower motor relay,if it works for awhile and then goes to only on high again change the relay and the blower motor.The relay is usually cheaper than the blower motor and thats why you should change that first.

Apr 07, 2010 | 1999 Dodge Intrepid

1 Answer

AC is stuck on high on my nissan titan 2006. I have heard it may be the resistor or the control panel


The blower resister is near the blower motor,mounted on the outside of the blower box,but actually goes inside the blower box.It~s function actually is to give the blower motor lower speeds.If it is only working on high,then this is the problem.If it works on high when you select a lower speed,then there is a high blower motor relay that is stuck in the closed position .Replace the relay.

Sep 09, 2009 | 2006 Nissan Titan

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