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Old 02-11-2017, 03:34 PM   #1
Ronklewin
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AC fan stopped running

Recently, my ac fan quit, after looking at a lot of threads here and elsewhere, it appears my climate control switch is shot. I pulled codes, nothing relating to hvac, pulled the fan motor and hooked it directly to battery, runs fine, very smooth. I have dual climate control, 98 coupe A/T daily driver.

What I have not seen explained, where is the climate control switch, and how difficult to r & r??

I found what I believe is the correct replacement AC Delco # 15-8756 on ebay for $145.00, and directly below that what appears to be the exact same switch, p/n 52479971, for $24.00. Discription of the second switch says it fits my vette.

I don't mind spending the big bucks if necessary, but I'm not big on throwing money away, either.

Thanks for any advice.
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Old 02-13-2017, 08:33 PM   #2
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Try Rock Auto for a chance at better quality
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Old 02-15-2017, 09:47 AM   #3
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I don't think the C5 has a 2 relay setup like a C4, where the lower settings have a relay and go through the resister and the high has a bypass relay to go directly to the blower, but there is a resistor for the blower motor. Have you checked that?

At ~$20-$40 it's something you may want to look at first.
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Old 02-16-2017, 09:28 PM   #4
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AC Fan stopped

I'd be glad to check it, can you tell me where it is, how to access and how to check??
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Old 02-17-2017, 10:23 AM   #5
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Have you verified that your R-134a level is exactly at what it should be? You're way off in Guessville instead of checking the most common issue that a car of your age would be experiencing. Add to that, the AC system is designed to NOT engage if the R-134a level is TOO LOW.
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Old 02-17-2017, 12:44 PM   #6
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Quote:
Originally Posted by Ronklewin View Post
I'd be glad to check it, can you tell me where it is, how to access and how to check??
Been a while since I looked at a C5, but IIRC, it is on the housing/duct the blower is attached and blows through, under the passenger side of the dash.

Someone please correct me here if I'm wrong.
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Old 02-17-2017, 10:08 PM   #7
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AC fan stopped working

Junkman, I like your idea, never considered the R-134 level could shut off the fan. I will get that checked soonest, and let you know.

Thanks for your advice, all.
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Old 02-18-2017, 12:12 AM   #8
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The place that you take it to should do a evacuation and recovery test. You will not only find out that your R-134a is too low, but you will also find out that you have a leak. If they charge the system and it fails the hold test, the leak is very bad. It is most likely going to be compressor seals but the green dye that they use will tell for sure.

If it is low but passes the hold test, you STILL have a leak. The AC system is completely closed and theoretically should NEVER lose capacity.
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Old 02-23-2017, 09:02 PM   #9
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AC fan stpped working

OK, here's my update. Took my vette to my trusted repair shop, there was a leak, but very small, they evaced and refilled, with dye, it passed the hold test, so he suggested I drive it for a couple of weeks and bring it back so they could look for leaks. They also wanted to replace the switch, but I thought based on what the Junkman said, maybe just refilling the Freon would get the fan to run, but no go.

So now I know the switch is bad, I believe I can replace it for less than the repair shop, so I'm back to my original question.

What I have not seen explained, where is the climate control switch, and how difficult to r & r??

I found what I believe is the correct replacement AC Delco # 15-8756 on ebay for $145.00, and directly below that what appears to be the exact same switch, p/n 52479971, for $24.00. Discription of the second switch says it fits my vette.

I don't mind spending the big bucks if necessary, but I'm not big on throwing money away, either.

Thanks for any advice.
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Old 02-23-2017, 11:18 PM   #10
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So now, you've verified that you have a leak. That is VERY IMPORTANT. The next very important question is does the outside temperature reading on your dual-climate control display show the CORRECT outside temperature?
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Old 02-24-2017, 11:07 PM   #11
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Yes, outside temp is reading correctly.
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Old 02-25-2017, 06:19 PM   #12
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Quote:
Originally Posted by Ronklewin View Post

I don't mind spending the big bucks if necessary,...
Hello. I noticed you are local to us and with your financial attitude towards your vette, I couldn't help but wounder how you feel about your car's power levels? 97-98 were bad years for the LS1. Insufficiently sized oil galleries and thin cylinder sleeves were some of the first things corrected as the LS engine family moved forward. Lately we have been stuffing LS3's into the c5's. It is a +100hp and +100tq Improvement over the LS1 and retains the same weight and vehicle balance..






We are also a magnuson dealer. because the ls3's take boost so well. and these power adders are ~20hp/psi increase. @6psi is 120hp and if you get the steel block lsx you can go way past that and get into adding hundreds of hp and tq to your motor that is already +100/+100 from where you are now. Even if you don't use us to chase power, you are close by. If you have any problems or are in the area stop by for an oil change and to check out our shop..

http://www.corvette-performance-expert.com/

We also have a dynojet 224-xlc eddy current dyno in house where we can wind your car out to 200mph and record up to 2000hp and 2000tq.
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Old 03-02-2017, 10:12 AM   #13
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AC fan

I was talking about the full cost of a climate control switch, not a new motor. If I could afford a new motor, I wouldn't be farting around trying to get my AC working.

Junkman, are you there??
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Old 03-02-2017, 11:19 AM   #14
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I made a post last night but for some reason, I don't see it! I must have been half sleep and posted in the wrong thread. I will respond back when I get free tonight.
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"Marines - Making the other guy die for his country for over 200 years."
Old 03-02-2017, 08:37 PM   #15
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That's great, thanks for your help!!
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