A/C compressors can be rebuilt, exchanged for equivalent re-manufactured units, or purchased new. While new is more expensive than used, we recommend new since it is difficult to determine the quality of a used compressor by simple inspection. Installing a used compressor only to find it is defective is not a pleasant exercise.
Note that the '84 Fiero was fitted with two different A/C compressors in its lifetime. It is necessary to measure the pulley to determine the equivalent replacement.
'84 w/5" Pulley: The compressor for this Fiero is the HR6HE
(Harrison Redesigned High Efficiency 6 cylinder). It is 9.3" long, 4.6"
diameter and weighs 12.6 pounds. The vehicles listed below had the
HR6HE as well as other compressor options, so finding a compressor may
not be as simple as finding a potential donor vehicle. In general, an
exact replacement may not be necessary to achieve adequate cooling. If
a compressor will fit it may be worth trying.
Pontiac Astro '85-86 2.5L Chevy Blazer S10/Jimmy S15 '85-86 2.5L Camaro '83-85 2.5L Firebird '83-85 2.5L Chevy S10/S15/Sonoma '85-86 2.5L GM Safari '85-86 2.5L
'84 w/5.75" Pulley: This compressor is unique to the '84-85 Fiero. (We are not certain, but believe it is the "DA6" compressor.) It came with either one or two switches. In general, an exact replacement may not be necessary to achieve adequate cooling. If a compressor will fit it may be worth trying. The compressor used in the '85 2.5L Fiero with 5.75" pulley is identical.
'85 2.5L w/5.75" Pulley: This compressor is unique to the '84-85 Fiero. It came with either one or two switches. In general, an exact replacement may not be necessary to achieve adequate cooling If a compressor will fit it may be worth trying. The compressor used in the '84 2.5L Fiero with 5.75" pulley is identical.
'87-88 2.5L: This compressor is unique to the '87-88 2.5L
Fiero. It has a 4.29" pulley and one switch in the rear of the
compressor. The following compressors may be worth trying in the '87-88
2.5L Fiero by changing the pulley, clutch, and switches as necessary.
Some of the donor compressors may have a plug in place of one switch.
In general, an exact replacement may not be necessary to achieve
adequate cooling. If a compressor will fit it may be worth trying.
Chevy Beretta '87-89 2.0L Chevy Beretta '90-91 2.2L Chevy Cavalier '87-89 2.0L Chevy Cavalier '90-91 2.2L O-ring on suction port Buick Century '93 2.2L Olds Ciera '93 2.2L Chevy Corsica '87-89 2.0L Olds Firenza '87 2.0L w/ OHC Olds Firenza '88 w/o OHC Buick Skyhawk '87-88 w/o OHC Pontiac Tempest '87-89 2.0L Pontiac Tempest '90-91 2.2L
'85-87 2.8L: There is some confusion (certainly on my part) about the compressor for these Fieros. The Hollander manuals say the compressor is the HR6HE (Harrison Redesigned High Efficiency 6 cylinder). The Pontiac "22P" manual refers to the compressor as the Harrison "DA6" (Downsized Axial 6 cylinder) and we believe the latter to be correct. The DA6 compressor has two electrical connections on the back end. Note that the DA6 is not considered a good candidate for conversion to R134-a refrigerant, probably because of the higher pressures.
The vehicles listed below are from Hollander and are in reference to
the HR6HE compressor. While the compressor designation may not be
correct, odds are the cars will have the same compressor as the Fiero.
Finding a compressor may not be as simple as finding a potential donor
vehicle. In general, an exact replacement may not be necessary to
achieve adequate cooling If a compressor will fit it may be worth
trying. Compressors from other Fieros are good candidates for swaps,
but brackets my have to be transferred along with the compressor.
Pontiac Astro '85-86 2.5L Chevy Blazer S10/Jimmy S15 '85-86 2.5L Camaro '83-85 2.5L Firebird '83-85 2.5L GMC S10/S15/Sonoma '85-86 2.5L GMC Safari '85-86 2.5L
'88 2.8L: The compressor for this Fiero is the Harrison HR6 (Harrison Redesigned internally DA6) with a 5.4" pulley. It is physically identical to the DA6 with two electrical connections. It is a good candidate for conversion to R134-a refrigerant. Cars which have the same compressor are:
Pontiac Grand Am '87-89 2.0L Buick Skyhawk '86 1.8L VIN "J" (8th digit) Buick Skyhawk '87 OHC, turbocharged Pontiac Sunbird '86-89 turbocharged
A/C Drier (Accumulator), '85-88: We have no information on the '84 drier and suspect it is the same as later years but cannot confirm this. The original GM part number for the '85-88 drier is 3059313 but this has been superceded by part number 2724666. An aftermarket version is Factory Air/Four Seasons part number 33181 typically available at Pep Boys and similar parts stores. AC Delco part numbers which also work are 15-1392 and 15-1670. Old driers should not be re-used since their ability to remove moisture is depleted.