|
|
Register To Post |
| parriedog49 | NO Air Cond | ||
|
Guru Newb
 
|
hello guys, starting a new project with my 85 c4. i no longer have an ECM (carb.383) after the swap my AC no longer works. i think i can get around the ecm but i cant find the AC relay. where should i look? i may have eleminated it from under the hood. i did ged rid of alot.
|
||
Posted on: 2009/7/29 20:02
|
|||
 Transfer
|
 
|
||
| bogus | Re: NO Air Cond | ||
|
Grand Imperial Pooh-Bah
 
|
wow... don't remember... wait for CentralCoaster.
Do you have the Helm Factory Service Manual? If not, you really need it... if so, it will have the schematic you need. |
||
Posted on: 2009/7/30 10:48
|
|||
|
_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
|||
|
Transfer
|
|
||
| CentralCoaster | Re: NO Air Cond | ||
|
Senior Guru
 
|
Hmm. I'll see if I can upload those pages for you. I don't know how the ecm integrates with it, but it's probably something really simple.
|
||
Posted on: 2009/7/30 14:49
|
|||
|
_________________
1985 Z51, ZF6 |
|||
|
Transfer
|
|
||
| Matatk | Re: NO Air Cond | ||
|
Webmaster
 
|
Do you have the manual a/c programmer or the automatic (c68) because I believe that makes a difference.
Matthew |
||
Posted on: 2009/7/30 22:04
|
|||
|
_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
|||
|
Transfer
|
|
||
| CentralCoaster | Re: NO Air Cond | ||
|
Senior Guru
|
I think all 85s are manual.
|
||
Posted on: 2009/7/30 22:43
|
|||
|
_________________
1985 Z51, ZF6 |
|||
|
Transfer
|
|
||
| captmike13 | Re: NO Air Cond | ||
|
Elite Guru
 
|
Yes the 85's are manual. No climate control to deal with.
|
||
Posted on: 2009/7/30 22:49
|
|||
|
Transfer
|
|
||
Mike| CentralCoaster | Re: NO Air Cond | ||
|
Senior Guru
|
Here's the pages from the electrical manual.
I didn't see any ecm connection whatsoever. There's an output TO the ecm, but I believe that's only so the ecm can raise the idle. |
||
Posted on: 2009/7/31 1:34
|
|||
|
_________________
1985 Z51, ZF6 |
|||
|
Transfer
|
|
||
1985 Corvette Electrical 8A (air conditioning).pdf| rayquayle | Re: NO Air Cond | ||
|
Senior Guru
|
Quote:
 Also it is used to turn on the Primary Fan.Follow CC's schematics. I suspect when you say your A/C no longer works, it is because your Compressor is not running and not that the Blower doesn't run. You need to look at the the two switches on page 220 of CC's attachment. I suspect a loss of gas during your swap and the Pressure Cycling Switch is open. The Compressor will not engage if this switch isn't closed. Check the switch with an Ohm meter. To verify, you can jump the two pins of the connector momentarily to see if the Compressor engages. |
||
Posted on: 2009/7/31 7:19
|
|||
|
_________________
Ray Quayle in England '86 Indy PaceCar, 4+3 NCM Founder #2896 NCM Lifetime #672 Graduate of Gordon's School |
|||
|
Transfer
|
|
||
| midlifecrisis | Re: NO Air Cond | ||
|
Guru Newb
|
Speaking from experience with my '95 C60 (manual A/C) this may differ greatly from your '85. But it's worth considering.
The schematics for both years show a rotary switch in the control head that controls on/off, fan, etc. But when my '95 ran the compressor all the time (even in the 'off' position) except when the temp dropped and the low pressure switch opened up, I decided to tear into the control head and examine the rotary switch. Lo and behold, not a rotary switch but a bank of transistor logic. One was shorted, sending the 'ground' signal to the PCM (ECM in earlier models) and turning on the compressor all of the time. 79 cents at Radio Shack and it now turns the compressor on/off as it should. Now the remainder of the '95 versus '85 circuits differ a lot; even the 'logic' is different (supplying 12v versus a ground signal and the PCM involved or not). So this may not be appropriate to your '95. But check the 12v signal from the control head. If it isn't there, you may have an open circuit transistor. OR a busted rotary switch. If the 12v is there, it's likely the low pressure switch or low coolant, as described above. Windy but hope this helps. |
||
Posted on: 2009/7/31 11:23
|
|||
|
Transfer
|
|
||
| rayquayle | Re: NO Air Cond | ||
|
Senior Guru
|
Quote:
It does. The '85 has no A/C Clutch Relay controlled by the CCM. There is no ECM involvement with respect to A/C Clutch Engagement on the early C60 cars. Quote:
Checking for 12v to Compressor Clutch is a good check, but we are still assuming that the OP's problem is with A/C Clutch engagement and not something else. He's not replied since the initial post, so we don't have any idea what "AC no longer works" actually involves. I made the assumption that since he had ripped out much under the hood and probably did an engine swap or at least a remove, rebuild, replace, that maybe something in the A/C lines was stressed and gas was lost, not allowing Clutch engagement. I know what ASSUMING can get you into, but with no other information to go on, I took a stab.  |
||
Posted on: 2009/7/31 15:06
|
|||
|
_________________
Ray Quayle in England '86 Indy PaceCar, 4+3 NCM Founder #2896 NCM Lifetime #672 Graduate of Gordon's School |
|||
|
Transfer
|
|
||
| BrianCunningham | Re: NO Air Cond | ||
|
Senior Guru
 
|
Quote:
The AC is out on my '95 I wonder if I have a similar problem. |
||
Posted on: 2009/7/31 15:15
|
|||
|
_________________
Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
|||
|
Transfer
|
|
||
| parriedog49 | Re: NO Air Cond | ||
|
Guru Newb
|
SORRY FOR NOT GETTING BACK TO YOUR REPLYS SOONER. BEEN TAKING CARE OF A VERY SICK WIFE. THANK 4 ALL YOUR HELP, I WILL LOOK OVER SYSTEM AGAIN, IT IS CHARGED, NO 12 V. OR GROUND AT COMPRESSOR, BOTH CLUTCH WIRES ARE CONECTED TO MAIN ENG. HARNESS, I THOUGHT I MAY HAVE REMOVED AC CLUTCH RELAY WHEN I REMOVED FUEL INJ. HARNESS FAN IS WORKING, DONT SHIFT BETWEEN DEFROST, FLOOR AND DASH, MAY HAVE OVER LOOKED VAC. HOSE? MY HAYNES DONT HELP MUCH. I NEED A WIREING DIAG.OF THE SYSTEM
|
||
Posted on: 2009/8/2 14:37
|
|||
|
Transfer
|
|
||
| CentralCoaster | Re: NO Air Cond | ||
|
Senior Guru
|
Quote:
You have one, it uploaded it in post #7. |
||
Posted on: 2009/8/2 16:28
|
|||
|
_________________
1985 Z51, ZF6 |
|||
|
Transfer
|
|
||
You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.
|
|