AC problems- Help

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Apr 4, 2009 | 07:53 AM

smitty01

Thread Starter

Cruising

Joined: Dec 2008

Posts: 14

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From: Prairieville LA

AC problems- Help

I posted a thread about a month ago about my ac blowing out the defrost, floor vents as well as the ac vents at the same time. I had a few responses saying they thought it was a vacuum hose problem. Does anyone know exactly where this hose is located......

Apr 4, 2009 | 08:09 AM

Mr.Bill

Race Director

Joined: Jul 2007

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From: Reno is so close to Hell you can see Sparks , State Of Confusion

St. Jude Donor '12-'13-'14

Can't help you, But I have read that the door in the unit get out of wack and it has to be recalibrated, You might try a search.
Bill

Apr 4, 2009 | 08:41 AM

sneakelman

Le Mans Master

Joined: May 2007

Posts: 5,383

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From: hagerstown md

St. Jude Donor '08-'09

The vacuum hose runs off the back side of the intake. It comes into the car underneath the battery. Remove the battery, then the battery tray and you'll see where the line comes in from the intake.
The line runs from the back of the intake, down through the wire loom, into a splitter, and into the car.
What happens is a couple things. The line comes off the back of the intake, battery leakage causes acid to get on the line making it brittle, and it breaks, or it just becomes brittle over time with age(it's a hard plastic line) and it breaks.
Remove the battery and tray, and start tracing the line back to the intake. Look for breaks, cracks, or splits. Then see if it came loose from the intake.
I'm betting one of these has happened. If you need to replace the line from the intake to the splitter, make sure you use rubber vacuum line instead of plastic, or you'll have to do it again eventually.
Good luck!

Apr 4, 2009 | 08:53 AM

smitty01

Thread Starter

Cruising

Joined: Dec 2008

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From: Prairieville LA

Thanks guys, I appreciate it

Apr 4, 2009 | 08:58 AM

madmatt9471

Team Owner

Joined: May 2006

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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Quote:

Originally Posted by smitty01

Yes! I had the same problem and I did a write up with pictures so here it is:
http://forums.corvetteforum.com/c5-t...with-pics.html

Thanks,Matt

Apr 4, 2009 | 12:29 PM

cjcvette

Instructor

Joined: Nov 2003

Posts: 167

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From: DFW Texas

Quote:

Originally Posted by madmatt9471

Yes! I had the same problem and I did a write up with pictures so here it is:
http://forums.corvetteforum.com/c5-t...with-pics.html

Thanks,Matt

Great write up. One thing to add, if you don't have a vacuum tester, you can blow through the lines with your mouth. It helped me isolate some small pinhole cracks that I couldn't see visually.

Apr 5, 2009 | 08:19 AM

madmatt9471

Team Owner

Joined: May 2006

Posts: 21,473

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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Quote:

Originally Posted by cjcvette

Great write up. One thing to add, if you don't have a vacuum tester, you can blow through the lines with your mouth. It helped me isolate some small pinhole cracks that I couldn't see visually.

Yes you can, "BUT" you must plug at least one end in order to get a true test.

I tell you that this 99.9% of the time is the culprit and quite a few of the fella's have called me and I have walked them through it on the cellphone

Any questions give me a call - see sig it's in there (Cell number that is

)

Thanks,Matt

Apr 5, 2009 | 09:43 AM

cjcvette

Instructor

Joined: Nov 2003

Posts: 167

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From: DFW Texas

Quote:

Originally Posted by madmatt9471

Yes you can, "BUT" you must plug at least one end in order to get a true test.

I would disagree, at least on the intake side. Once I fixed the holes I couldn't blow any perceptible amount of air through it even with it connected to the back of the intake manifold.