A/C and Heater quit working - Nissan Armada Forum: Armada & Infiniti QX56 Forums
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#1 Old 11-30-2012, 08:52 AM
MRhodes
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Unhappy A/C and Heater quit working

Hi! Starting on Monday I noticed a funny metallic smell coming out of the vent in the front of my 2008 Armada SE 2WD Flex that lasted for a couple of days and then yesterday the heater and a/c just quit working. The rear a/c and heater are also not working. The rear seem to be blowing air and changing speed but no cool air is coming out. The front a/c and heater nothing comes out.

I have looked around and some posts say thing about fuses, blower motor, or a relay of some type. I am a bit confused and am hoping some one here has either had this problem or can help me pin point what the culprit might be.

Thank you so much!

Last edited by MRhodes; 12-01-2012 at 05:40 PM. Reason: The rear a/c will not cool
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#2 Old 11-30-2012, 12:09 PM
Pops
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Garage
The smell would lead me to think the fan motor (blower) might've died.
Alot of times I'll pay a dealership 1-hr shop time for diagnoses then repair the problem myself, that keeps me from buying expensive unnecessary parts. http://www.CourtesyParts.com has awesome prices but very terrible customer service so I usually get a ball park price from their site then call around locally for someone who will sell close to that price.

- Bob
2005 Armada LE 4x4

Last edited by Pops; 11-30-2012 at 12:11 PM.
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#3 Old 11-30-2012, 01:07 PM
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Thank you. I think that is what we are probably going to end up doing. It could be so many things
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#4 Old 11-30-2012, 08:01 PM
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Easy

A burnt motor is easy to diagnose. If you have a multimeter you can check for resistance across the motor winding. If no multimeter pull the blower motor out and direct straight to the battery. The blower only has 2 wires. One positive and one negative. If you can save yourself a few pennies replacing the parts yourself it'll be much better to diagnose yourself and save even more pennies. The ac and heat System should still be working just the blower itself not working. There are three screws holding the blower. Size 5.5mm. Lay on the passenger side floor and look up you'll see the blower motor. If you don't have a multimeter. I recommend getting one or even a test light will work for this troubleshooting too.

For the test light. Diagnose. Pull the harness out that's connected to the blower. Install your test light on that harness it won't matter which is positive or negative. Turn the blower on if the light turns on then you know there is power being supplied to the blower and all you need is a new blower.
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#5 Old 12-01-2012, 09:33 AM
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Quote:
Originally Posted by Pops View Post
The smell would lead me to think the fan motor (blower) might've died.
Alot of times I'll pay a dealership 1-hr shop time for diagnoses then repair the problem myself, that keeps me from buying expensive unnecessary parts. http://www.CourtesyParts.com has awesome prices but very terrible customer service so I usually get a ball park price from their site then call around locally for someone who will sell close to that price.
Pops - That is an awesome idea. I've been trying to track down a clicking / popping noise on my 07 LE and I've already dumped ~$250 in U-Joints that didn't need replacing (that was due to getting sent the wrong ones from Northern Drivetrain initially and having to buy a rear and grease gun locally).

Now the only trick is finding a competent dealer in Long Island, NY....

Giggity
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#6 Old 12-01-2012, 05:38 PM
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So today I tried to turn on the a/c in the rear and that is also not cooling but it is working. It turns on/off and blows air but does not cool.
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#7 Old 12-01-2012, 10:48 PM
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Same

Quote:
Originally Posted by MRhodes View Post
So today I tried to turn on the a/c in the rear and that is also not cooling but it is working. It turns on/off and blows air but does not cool.
The front and rear share the same ac unit. Just different Evaps and blowers. When you checked the rear ac has it been running for a while or you just started the truck and rear ac not working?
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#8 Old 12-02-2012, 08:11 AM
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When I checked the car had been on for a while (15 minuted or so) but my daughter said that the air was never cold.
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#9 Old 12-02-2012, 06:43 PM
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check

check as soon as you start the car and turn on the ac for the first time of the day. With the front blower not working it will eventually create a ice blockage in the line and will in turn wont have a refrigerant gas to liquid flow to either the front or back. The main is the front and is closer to the compress and will create restriction. Best bet is to check you blower. Also, start your car, run your ac, pop your hood, and check your ac compressor. bottom passenger side if i remember right. if the front plate of the pulley is turning then your compressor is turning should feel cold air.
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#10 Old 12-03-2012, 01:06 PM
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Thanks everyone for all the help! The problem was the blower motor! It has been fixed and the heater and a/c is working better than ever
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