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Cant tell if AC bad smell TSB was done??

Quadrasteer

By Quadrasteer
in Ask A GM Technician

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Quadrasteer Enthusiast

Quadrasteer

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I had a long list of things fixed at the dealer today, it was like pulling teeth. The AC" bad smell" TSB was supposedly done but the high blower never came on by itself and never came on after the truck ('02 SD) was shut off. Can you see the module and relay with wiring splices under the hood that were supposed to be replaced? There's no smell so far so I think that they cleaned and coated the evaporator. I know that they ordered the parts just not sure that they did the whole TSB. How can I tell?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
Can you see the module and relay with wiring splices under the hood that were supposed to be replaced?

 

It's not put under the hood. It is wired directly into the blower power/ground wires, so it has to be somewhat close to the blower motor, under the dash. You should be able to see that they tapped into the blower wiring.

Quadrasteer Enthusiast

Quadrasteer

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I had a long list of things fixed at the dealer today, it was like pulling teeth. The AC" bad smell" TSB was supposedly done but the high blower never came on by itself and never came on after the truck ('02 SD) was shut off. Can you see the module and relay with wiring splices under the hood that were supposed to be replaced? There's no smell so far so I think that they cleaned and coated the evaporator. I know that they ordered the parts just not sure that they did the whole TSB. How can I tell?

 

 

 

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

The Electronic Evaporator Dryer will activate when the ambient temperature near the module is above 16° C (60° F) when the vehicle is started up.

 

Approximately 30 minutes after the vehicle has been turned off, the blower will activate for 10 seconds every 10 minutes for 2 hours unless the vehicle is restarted.

 

If a restart occurs, the Electronic Evaporator Dryer module will reset automatically. This on/off blower activation will dry the evaporator core and case reducing the chance of reoccurring A/C odor.

 

The Electronic Evaporator Dryer is self fused and has a battery rundown protection feature that inactivates the dryer if voltage drops below 12.5 volts.

toneman Enthusiast

toneman

Posted
Posted
The Electronic Evaporator Dryer will activate when the ambient temperature near the module is above 16° C (60° F) when the vehicle is started up.

 

Approximately 30 minutes after the vehicle has been turned off, the blower will activate for 10 seconds every 10 minutes for 2 hours unless the vehicle is restarted.

 

If a restart occurs, the Electronic Evaporator Dryer module will reset automatically. This on/off blower activation will dry the evaporator core and case reducing the chance of reoccurring A/C odor.

 

The Electronic Evaporator Dryer is self fused and has a battery rundown protection feature that inactivates the dryer if voltage drops below 12.5 volts.

 

 

 

Wow...learn something new every day--thanks for the tidbit, GM-Tech! I guess that would explain why my A/C has been smelling pretty putrid these days...I mean, it gets pretty hot in the summer where I live, so I have the A/C running all the time; until recently, my A/C never stunk pretty bad every time I had to turn it back on after having it off for a while.

 

Does this EED module exist on all GM NBS trucks/SUVs?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
Does this EED module exist on all GM NBS trucks/SUVs?

 

It doesn't exist on any new body style trucks. It's an add-on gizmo installed by the service department... and a very expensive gizmo at that! It's around $400 for the part alone.

 

Some of the newer vehicles have this afterblow function built into the HVAC control head if the vehicle has auto air and it is not enabled by default but can be turned on with a Tech 2. As far as I know the full size pickups and tahoe/suburban do not have this... yet. Trailblazer does as does Aurora and the new body style Malibu. Those are the only ones I know of for sure. There are probably others.

Quadrasteer Enthusiast

Quadrasteer

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Thanks for all the info! I found the module under the dash by the blower motor and saw the sticker that's required on the firewall. I haven't heard the blower come on even once yet and they said that the old filters are not replaced as part of the TSB. Three days after it was done the smell came back! Not as bad as before and it seems to come and go. Mabye there's some bacteria on the old filters that starts to grow after a while. I'll change them.

toneman Enthusiast

toneman

Posted
Posted

Darn...no EED--and to add insult to injury, no cabin air filter on '04+ NBS...which means, "smelly air in my DXL when I turn on A/C", followed by, "time to spray Lysol into the air vents"...oh well...

  • 2 weeks later...
bmcduffy Enthusiast

bmcduffy

Posted
Posted

Well............I'll be darned. An automatic blower, they think of everything these days. I used to be a service advisor for Cadillac many moons ago (1990). One of our biggest warranty complaints was the smelly A/C problem.

 

You could hit the vents with Ozium till the cows came home and the problem always returned. The solution as it turns out, was to turn the A/C to vent for about 30 seconds before you shut the vehicle off. Worked like a charm. Had something to do with opening the doors and letting the air circulate. The problem with sharing this oh so great secret with the clients were most of them were too danged lazy to do it.

 

I bought my Silverado new in 1990 and have always switched to vent before shutting down and the A/C has NEVER smelled. It just became habit, I usually don

't even realize that I'm doing it but works great.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

All newer vehicles are prone to this condition. It's not any specific vehicle or model year. And not all people will smell it, even if it does exist. Personally, it'd have to be very strong for me to even notice it. My boss will go, "Yeah, that smells" and I don't smell squat.

 

I've also read that a woman has a sense of smell several times better than a man, and as it turns out, most of the complaints we get about this problem is from women, so perhaps that is true.

 

There's been times when I've dragged our cashier (female) out to car and said, "Smell this." :dupe: Just to be sure I wasn't just immune to whatever it was they were smelling.

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