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Old 03-11-2012, 09:11 PM   #1
kevster0522
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Default HVac Lights not working!

So I just installed a new car radio in my 95 sl1 and noticed that all the lights where the temperature and fan controls are are all burnt out. I checked the fuses that I thought related to those lights and they all were fine! I even put in the old radio to see if that would fix it but it didn't. Can someone please help me?

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Old 03-11-2012, 09:53 PM   #2
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Default Re: HVac Lights not working!

Did they work before? Pull the HVAC panel and check/replace the bulb.

I can only reference a Gen-II+ but, I'd expect it should be similar?

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Old 03-11-2012, 10:08 PM   #3
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Default Re: HVac Lights not working!

Thanks for the quick reply

They defiantly worked before I installed the radio. I can't remember if they worked right after I installed it or if they stopped working today (I installed the radio yesturday).
Unfortunately I don't have any bulbs to test it with but I did put a volt tester (just two prongs with an led on the end) to the lights leads and I didn't get anything so I think they aren't getting power from somewhere or my volt tester isn't working. I also looked at the bulb and the filament doesn't look broken. I would also assume the 2nd gen would be close to the same.

Last edited by kevster0522; 03-11-2012 at 10:21 PM..

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Old 03-11-2012, 10:22 PM   #4
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Default Re: HVac Lights not working!

Did you muck with the OEM wiring harness or just get the correct GM adapter for the aftermarket radio?

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Purchased 114k 10/07
Added OEM CC

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Old 03-11-2012, 10:42 PM   #5
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Default Re: HVac Lights not working!

I just got an adapter.

The kit I got was one on ebay. it came with the wiring harness, antenna adapter, and body kit.

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Old 03-11-2012, 11:19 PM   #6
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Default Re: HVac Lights not working!

Did you completely insulate the ends of the unused wires? It's very common to have a short that blows the fuse (10a under the hood), which will generally leave hvac, cluster, and rear driving lights out.

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Old 03-11-2012, 11:27 PM   #7
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Default Re: HVac Lights not working!

Yes I did read about that. I did insulate the wires and my rear parking lights work.

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Old 03-11-2012, 11:45 PM   #8
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Default Re: HVac Lights not working!

Could it possibly be because I didn't connect the orange illumination wire on the harness I bought? there wasn't an illumination wire for the radio so I didn't think I needed it.

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Old 03-12-2012, 04:26 PM   #9
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Default Re: HVac Lights not working!

An update of what I've done. So I found a real multimeter to test the connections. I went straight the the bulbs and on the metal connectors I was getting around 11.5 volts but the lights weren't on! so I assume they are both burnt out somehow but I cant figure out how to take the bulb out of the casing its in to disconnect the wires. Also Does anyone know what size of bult these are? I might just replace them with led's because they might be easier to find.
I will attach pictures of what I'm looking at to help understand.
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Last edited by kevster0522; 03-12-2012 at 04:35 PM..

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Old 03-12-2012, 08:51 PM   #10
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Question Re: HVac Lights not working!

Can someone inform me on how to remove the bulb from the casing around the light bulb itself?

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Old 03-12-2012, 10:50 PM   #11
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Default Re: HVac Lights not working!

That looks like it's a #161 bulb? Try wiggling it side to side a little and pull straight out of the connector. They can be a little tight and hard to grab onto. Sometimes a piece of clear tubing (same size as the bulb) slipped over it helps.

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1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh!
Purchased 114k 10/07
Added OEM CC

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Old 03-13-2012, 03:57 PM   #12
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Default Re: HVac Lights not working!

wow thanks for all your help! the rubber tubing did the trick. I took the two bulbs out from the hvac and they were clearly burnt out. then I decided to check the cup holders and the cigarette lighter and that was burnt out too (they were a little different bulbs). now to figure out where to get new ones.

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Old 03-13-2012, 07:14 PM   #13
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Default Re: HVac Lights not working!

Hey off-track, how did you guess the size of the bulb being #161? is that like a universal size or something? If you could help me find the right bulbs that would be fantastic. I looked at the bulbs closely and the ones from the HVAC say tsd74 on them and the ones from the cup holder and cigarette lighter say t73. I don't know if it makes a difference because they look pretty close to the same but if you could tell me what size to look for that would be great.
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File Type: jpg Optimized-IMG_0014.JPG (65.1 KB, 3 views)

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Old 03-13-2012, 08:03 PM   #14
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Default Re: HVac Lights not working!

I was guessing based on the size of the glass protruding from the socket.. and I was wrong. A #161 is a shorter bulb. #74 & #73 are what to look for. You can get them in blister packs from any parts store.

FWIW, it's usually a good idea to clean the cup socket with some alcohol or contact cleaner before installing a new bulb. That socket tends to get gummed up from spilled soda's over time.

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1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh!
Purchased 114k 10/07
Added OEM CC

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Old 03-13-2012, 09:46 PM   #15
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Default Re: HVac Lights not working!

Thanks for all your help! I just went to fleet farm and picked up 4 #74 bulbs. they didn't have any 73 but these seem to work fine. you were right about the cup holders they were mega sticky. the previous owner must have spilled something because I've only had the car for about 2 months. But anyway thanks again the car is shining bright again.

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Old 03-13-2012, 10:14 PM   #16
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Default Re: HVac Lights not working!

NP, didn't know there were any FF's up there? I guess they are expanding? They are Mad's favorite destination (poke, poke)

Oh,and a belated Welcome! Your fingernails are too clean. Time to do more work on the Saturn!

...
1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh!
Purchased 114k 10/07
Added OEM CC

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