Question about 2002 Nissan Sentra

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Heater selecter the heater selecter only works on high .

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U need a new resister switch. get it from nissan

Posted on Jan 23, 2009

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Heater fan only works high


it sounds like the heater switch itself is bad. I would change it.

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Where is the high speed fan relay on a 95 lumina apv?


The photo I have shows the high speed relay on the firewall or on the heater box in the engine compartment. It should be near the blower motor.

Jul 10, 2013 | Cars & Trucks

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Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

Jun 28, 2011 | 2006 Chrysler PT Cruiser

1 Answer

Heater blower will only work on high


You need a new blower resistor by the sounds of things. When you select the three lower speed settings, the current supplied to power up the blower motor goes through the resistor, to slow the speed of the blower motor down. When the high speed is selected, the resistor is bypassed, and full current is passed to the blower. I believe the resistor is $12 at an auto parts store. Good Luck Tim

Mar 30, 2011 | 1999 Oldsmobile Alero

1 Answer

All the heater blower speeds work on my 1998 Suburban except the high speed. I have replaced the blower motor and the switch. What else could the problem be? I have seen some writings about a resistor but...


Hello Boco.

In your Suburban there is a high blower relay.
When the switch to high is selected it activates a relay to another circuit that is fused separately.
This fuse in under the hood marked blower fuse 3 which is a 50 amp fuse.
This is most likely the problem.
However, if it isn't then the problem becomes the relay, the switch or a broken wire.
If it isn't the fuse, contact me back here using comments and I will help you with the next step in fixing your heater blower.

Thank you for using FixYa.

KL

Jan 21, 2011 | 1998 GMC Suburban

1 Answer

Heater controls


It may be your blower motor RESISTOR, in gm cars it may look like a card that is connected near the blower motor,under the dash, on most cars this is what gives you variable speeds, except on the HIGH speed is usually wired directly to the battery through a relay.

Mar 29, 2010 | 2001 GMC Yukon

2 Answers

My heater is not blowing hot air


WELL YOU NEED TO CHECK THAT THE BLENDOORS ARE WORKING BUT OPEN HOOD WHEN CAR IS WORM TO RUNING TEMP FEEL THE HEATER HOSE THEY SHOULD BE HOT IF THEY ARE ITS MOST LIKELY BLENDOOR MOTOR OR BLENDOOR BROKE. HOPE THIS HELPS

Aug 18, 2009 | 1998 Jeep Wrangler

1 Answer

2003 Camry A/C and Heater fan only works on High


The heater fan resistor has failed. This is the device that controls the voltage to the fan motor, on the 3 lower speds, The resistor is bypassed when HIGH is selected. It is located under the dash, passenger side, on the box between the heater fan blower housing and the main heater box at the center. Held in by 2 phillips screws. Easy to change.Hope this helps, and Thanks for choosing FixYa. Please feel free to comment back if you have any other questions.

Nov 11, 2008 | 2003 Toyota Camry

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