Pennock's Fiero Forum
  Technical Discussion & Questions
  '86 2M6 with '95 LT1 SBC, Want to get A/C system running. Use HR6 Compressor?

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
'86 2M6 with '95 LT1 SBC, Want to get A/C system running. Use HR6 Compressor? by hdryder
Started on: 08-06-2013 08:01 AM
Replies: 6 (409 views)
Last post by: hdryder on 08-09-2013 07:51 AM
hdryder
Member
Posts: 674
From: Virginia Beach, VA, USA
Registered: Apr 2011


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-06-2013 08:01 AM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Last fall I purchased a '86 2M6 that had a 9 year old LT1 swap using Archie parts.
The car originally had factory A/C, but it was not hooked up for the V8 swap.
I would like to get the A/C system operational soon.

Can I use a Fiero HR6 Compressor?
If anyone has done a SBC V8 with working A/C, do you recall what compressor mounting brackets were used for the SBC?

Thanks for the help.
IP: Logged
PFF
System Bot
fieroguru
Member
Posts: 11668
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 257
Rate this member

Report this Post08-06-2013 10:48 AM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
You can reuse the stock fiero compression, but you will need to swap the AC clutch assy to serpentine belt pulley. Also, with the belt on the LT1 being further from the face of the engine, you will need to shim out the AC compressor to meet it. The Archie front engine mount has built in ears for mounting the AC as well as a 2nd AC mount bracket that can also be used. Here is a similar setup on a traditional SBC:

IP: Logged
hdryder
Member
Posts: 674
From: Virginia Beach, VA, USA
Registered: Apr 2011


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-06-2013 09:53 PM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks fieroguru!
That information and photos are a great help!
Thanks again.
IP: Logged
Darth Fiero
Member
Posts: 5890
From: Waterloo, Indiana
Registered: Oct 2002


Feedback score: (5)
Leave feedback





Total ratings: 360
Rate this member

Report this Post08-07-2013 04:06 PM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by hdryder:

Last fall I purchased a '86 2M6 that had a 9 year old LT1 swap using Archie parts.
The car originally had factory A/C, but it was not hooked up for the V8 swap.
I would like to get the A/C system operational soon.

Can I use a Fiero HR6 Compressor?
If anyone has done a SBC V8 with working A/C, do you recall what compressor mounting brackets were used for the SBC?

Thanks for the help.


Are you going to want to hook this A/C system up under the LT1 PCM's control? If so, I might have some helpful info but I need to know what service number is on the PCM you are using.

-ryan

------------------
OVERKILL IS UNDERRATED

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

IP: Logged
hdryder
Member
Posts: 674
From: Virginia Beach, VA, USA
Registered: Apr 2011


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-07-2013 07:08 PM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Ryan,
Is that what would be needed to get the A/C system to work correctly with the LT1 swap?
Thanks for the help.

P.S. I still have the '94 3800 N/A Series I motor w/5speed in a '85 Fiero, that I will need your help programming, etc., when I bolt on a '95 Series I SuperCharger, intake, etc. for one of the next future projects.
IP: Logged
Darth Fiero
Member
Posts: 5890
From: Waterloo, Indiana
Registered: Oct 2002


Feedback score: (5)
Leave feedback





Total ratings: 360
Rate this member

Report this Post08-08-2013 12:56 AM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
1992-95 OBD1 LT1 computers need a number of inputs to permit/activate the A/C clutch relay output. You'll need:

-A 3-wire A/C pressure sensor mounted on the hi-side line
-A 3-wire A/C Evaporator Temperature Sensor Module with remote (wired) sensor probe mounted in the evaporator core itself
-An A/C Clutch status wire (just tie into the green wire that goes to the A/C clutch)
-An A/C Request Signal (from the Fiero HVAC control panel)

(The LT1 PCM controls the A/C clutch relay much like how the stock Fiero system works.)

The A/C Evap Temp Sensor module is a small box with 3 wires going in and 2 coming out mounted inside the donor LT1 car behind the glove box and you should be able to get to it quite easily (at least in F and B body applications). What you can't easily get to is the actual sensor probe which is attached to this small module via the 2 wires because the temp probe itself installs into the evaporator core, which is buried in the HVAC housing. What I have done in the past was just cut the remote probe wires so I could get this "module" out of the donor car. Then I've wired up a standard GM intake air temp sensor to this module and installed the temp sensor into the evaporator box in the engine compartment (or in the case of the Fiero, it would be in the front trunk compartment). When I've done this, the PCM enabled A/C operation and didn't have much issue with me using an IAT sensor as the temp probe for the A/C evaporator temperature module.

[This message has been edited by Darth Fiero (edited 08-09-2013).]

IP: Logged
hdryder
Member
Posts: 674
From: Virginia Beach, VA, USA
Registered: Apr 2011


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-09-2013 07:51 AM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Ryan,

Thanks much for the help on this!

[This message has been edited by hdryder (edited 08-12-2013).]

IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock