348 HVAC panel

Ditto. My shop is looking at mine again a second time. If you do a forum search you’ll find a post where a member found an engineer to repair his. It can’t be hard. That’s my next step.

 

There is a diagnostic mode on the HVAC panel have you run through that to see what it says? Also if the heat pump in the front bonnet for the cabin heater seizes that can cause the HVAC panel to go haywire and blow caps etc.

 

My heat and AC work great, the issue seems to be that the panel doesn’t get enough power most of the time and is dim as a result and won’t let me make selections. Not sure if the issue is internal to the circuit board or simply a power supply issue. Fingers crossed.

 

You check your hidden fuse?

 

Why would a fuse cause a brown out situation? Sometimes it works fine, just not for long. Could be once it heats up it or the vibrations of driving makes it fail. It’s not a binary situation.

 

Because what happens is the fuse holder gets a ton of resistance in it and melts, while the fuse generally stays intact. As this occurs the resistance grows, and could cause power fluctuations to the panel until all power is eventually lost.

My friend's 348 needs a new hidden fuse holder/fuse and we'll be doing that work here soon.

 

You can see the glass bullet fuse to replace the plastic fuse holder.

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The electrical plug on the rear of the unit has caused documented problems of not making good contact. The later units are different as a result. I seem to recall it was because the wiring harness is somewhat short. Check that after the fuse review.

 

Repining it may work as a last resort, I did my MAFs it takes no time to do. That said... often deoxit and cleaning pins and contacts works for many. Also inside the unit there is a chip board sandwich, they go together with pins, those have been identified as a source of intermittent failure as well, cleaning them and reassembly has worked for many cars. I think it's in the DIY section.

I'd clean them both with deoxit and some scotchbrite and see. I bet it works.

 

I know a dealer that has one HVAC for the 348 in stock NOS, $4200, PM me for more info.

 

I also have one in a box just in case.

 

$4200. Oooo fa.


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Ahem. Why I question you guys is beyond me.


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Same reason replacing 30 year old relays fixes many issues.

Make sure they use a glass bullet fuse like post #7 above shows on my car.

 

Gotcha. I’m willing to grow parts at a problem but my mechanic insists on being methodical.

 

I bet $10 the mechanic got stumped and searched fchat.

 

No, I asked about it specifically.

 

Ask him where I can send the bill for my diagnostics fee?

 

Ok, but you have to split it with the 300 other people who suggested it.

 

That fried fuse saved me $3,000 when I purchased my car 10 years ago.

 

Because you negotiated 3k off for broken hvac? Nice.

 

Yep! The previous owner said he checked all the fuses but actually neither of us were aware of the fuse in question at that point. It was only until I got the car home and began a deep dive here on the forum that I was able to find out about it. When I saw that toasted fuse I got a real big smile on my face that only got bigger when I replaced that green 30 amp and the air blew real cold.

 

Nice! Did you pay BJ his royalty?