Cabin Fan

[Jim Nolan]

The cabin fan will not shutoff, it runs constant at 1oo%. No setting will reduce or shutoff the fan. The bad part is I had to disconnect the battery to shut it off. After the engine shut off and the key removed it still ran. I checked the fuse and it was good. Before I start tearing things apart I need some input on any thing simular.

[secondchance]

I had a similar situation resulting in dead battery in 3 days. My fan was running, even with the car shut off, at such a low speed I could barely hear it.
Replacing the fan control module on top of AC evaporator housing on the passenger side under hood was the fix.
Quick check would be pull the plug (there are two plugs) closer to the bulkhead and see if the fan turns off. Be careful, this plug is always hot (electrically), even with the ignition in off position.

[Jim Nolan]

I pulled the plug on the blower module and the fan quit. Was a new module available at auto parts store or GM only?

Jim

[Mystic ZR-1]

check with Steve (efnfast) sounds like the problem he had. not sure how he fixed it... we had to pull the fuse every time we shut the car off on the way back to New England from the Gathering last May

[efnfast]

Doug, I never fixed it, and it never reoccured.

[secondchance]

I pulled the plug on the blower module and the fan quit. Was a new module available at auto parts store or GM only?

Jim

Rock auto carries this module from multiple sources.

[Jim Nolan]

Well I ordered the module from Rock Auto and I sent it back today. It was the only one they show for '92 ZR-1 and it won't fit in the evap box. It's too long and hits inside the the box not allowing it to be bolted in and sealed, and I had to pay to have the part shipped, both ways. Any other suggestions on suppliers?

Jim

[secondchance]

Well I ordered the module from Rock Auto and I sent it back today. It was the only one they show for '92 ZR-1 and it won't fit in the evap box. It's too long and hits inside the the box not allowing it to be bolted in and sealed, and I had to pay to have the part shipped, both ways. Any other suggestions on suppliers?

Jim

Which one did you order from the Rockauto? AC Delco?
Another option is to find one on ebay, compare visually with your old one. If not functioning when installed, at least you'll get a refund.

[secondchance]

Eckler's Corvette shows three different versions - 86-89' 90-92 and 93-96.

[Jim Nolan]

Well the saga continues. The only one pictured with Ecklers was the one that will not fit. I went to the AC Delco web site and they show the same one as Rock and Ecklers. So I guess the Evap. box for the ZR-1 is different from an LT-1. I took all the part #'s off the old one and could not find anything compatable. If you look closely you can tell it was out sourced where as the original is solid state made in Japan. I guess it is plugging and unplugging the blower fan for now.

Has anyone dealt with any reputable Corvette salvagers?

Jim

[aafc]

Hi Jim,
Call coastal corvettes @ 321-480- 0228 the owner's name is John. He is located at
3435 hwy 1 in Mins. he might have a used part.
John
1990 white/black #2546

[secondchance]

This one says for 90 to 92 model year. AC Delco 15-71642 (12368387, 47514) and 93.9 mm long.
http://www.ebay.com/itm/HVAC-Blower-Control-Module-fits-90-92-Chevrolet-Corvette-/190991553768?hash=item2c77fbd4e8:g:iW4AAOSwLVZVm-TI&vxp=mtr

Cross check part number and check the measurement. Good luck!

[Jim Nolan]

Well there seems to be another part for the ZR-1 that is no longer available, "blower fan module".

Ordered from Rock Auto sight unseen, bad move. It was too long and mounted backwards hitting the inside of the box and sticking up about an half inch. Sent back. Looked on line at other parts houses they pictured the same. Contacted AC Delco with original part # and they referenced the same remufactured part. Ecklers showed a picture of one for 90-92, picture looked but when I received it it mounted correctly but was too long. Evidently LT1 and LT5 box is not the same.

The final solution was to take the Eckler part and cut off the lower 2 cooling fins. So far so good, fan works as advertised.

Jim

[IMZZ]

I show the original GM part # 16086891. It should be the same for 90-92 with option C68.
There is one listed on Amazon by Corvette Central pictured.

[IMZZ]

Thanks for posting your solution so people searching in the future have info to go on.

My guess is that GM changed the design for better cooling and they used that same module on several different models and didn't have any way to test fit it in everything they used it in.