BEFORE & AFTER - Air-Conditioning & Heating

EVAPORATOR UNITS

May, 2025
1969-72 Pontiac Grand Prix
EVAPORATOR UNIT

The unit was built with a new evaporator, 134a POA eliminator valve, expansion valve and blower motor.
The resistor was cleaned & tested to function correctly. The fiberglass housing was had a few minor fiberglass

repairs, then refinished.

Often confused as the same as all 1968-72 GM A-Body cars. (like Chevelle, GTO/LeMans, Skylark, Cutlass)
This unit is unique to 1969-72 Grand Prix, with the main difference being the thickness of the outboard (fender-side)

to accommodate a larger blower wheel. Also, the inboard case does not have an indent the notch those cars, and does

have a large "G" on it.

This unit is the same for 1969-72 Grand Prix.

January, 2025
1973-91 Chevy/GMC Suburban/Jimmy/Blazer
REAR EVAPORATOR UNIT

Rebuild included the following; - RECONDITIONED Evaporator. Flushed clean internally, acid cleaned externally,
straightened fins and pressure tested with nitrogen at 220 psi while submerged in water for 12 hours.
RECONDITIONED Expansion Valve. RECONDITIONED Blower Motor & Wheel Assembly. Run for 12 hours. BEAD-BLASTED & PAINTED Mounting Brackets.

May, 2024
1970 Chevy Impala A/C Evaporator Unit

Restored for Chris H, the housing was restored to it's original finish after a minor fiberglass repair.
It was built with a new evaporator, 134a POA eliminator valve, expansion valve and blower motor.
The ambient sensor switch and blower switches were cleaned & tested to function correctly.

This unit is the same for 1969-70 full-size Chevy models, with the only difference between
ATC (Automatic Temperature Control) and Manual A/C being the a/c blower resistor.

September, 2023
1995-99 Chevy Truck A/C Evaporator Heater Plenum Unit

The evaporator housing was restored to it's original finish.
A new evaporator, heater core, orifice tube, blower motor, resistor, both actuators & drain hose were installed.
The entire unit was set up ready to install back in the dashboard, connect the rest of the ducting, wiring and a/c & heater hoses.

June, 2023
1973 Chevy "Square Body" A/C Evaporator Unit

The evaporator housing was restored to it's original finish.
A new evaporator, orifice tube, accumulator, blower motor assembly and resistor were installed.
The entire unit was sent back ready to bolt up to the firewall, connect hoses and wiring and use!

June, 2023
1973 Chevy "Square Body" A/C Evaporator Unit

The evaporator housing was restored to it's original finish.
A new evaporator, orifice tube, accumulator, blower motor assembly and resistor were installed.
The entire unit was sent back ready to bolt up to the firewall, connect hoses and wiring and use!

May, 2023
1968 Pontiac Firebird A/C Evaporator Unit

The housing was restored to it's original finish after a few minor fiberglass repairs.
It was built with a new evaporator, resistor, blower motor, new Billet style POA Eliminator Upgrade valve that closely resembles the original Frigidaire POA valve.
The original Frigidaire expansion valve was restored.
The ambient sensor switch was cleaned & tested to function correctly.

For the most part, this unit fits 1967-69 Firebird & 1967-68 Camaro with Big-Block engine with only a handful of difference.

August, 2022
1970 Pontiac Firebird A/C Evaporator Unit

This unit was originally a 70 Camaro unit, but was built for a customer who needed one for a Firebird.

The housing was restored to it's original finish after a few minor fiberglass repairs.
It was built with a new evaporator, 134a POA eliminator valve, expansion valve, resistor and blower motor.
The ambient sensor switch was cleaned & tested to function correctly.

For the most part, these units are the same from 1970, 1971, 1972 and 1973 Chevy Camaro & Pontiac Firebird, with only a handful of difference.

February, 2022
1963-65 Chevy Corvette A/C Evaporator Unit

Rebuild for one of our customers that wasn't extremely particular, like most C2 Corvette owners.
This unit was built using a new evaporator, blower motor, resistor, high-fan relay and replacement expansion valve.
The housing was restored, with a few minor repairs.

The support clamp between the two pieces was missing, so we fabricated one for function purposes.
The STV (Suction Throttling Valve) was not provided for us to rebuild.
INTERCHANGE - For the most part, these units are the same for 1963, 1964 & 1965 Corvette with factory air-conditioning.

HEATER BOXES

May, 2025
1969-72 Grand Prix A/C Heater Box

The unit was built with a new aluminum heater coil.
The fiberglass housing was refinished. The foam diverter door was replaced.
All three actuators were cleaned & tested to function correctly.
This unit is the same for all 1969-70 Impala with manual factory air-conditioning.

May, 2024
1970 Impala A/C Heater Box

Restored for Chris H, the unit was built with a new aluminum heater coil.
The fiberglass housing was refinished. The foam diverter door was replaced.
Both actuators were cleaned & tested to function correctly.
This unit is the same for all 1969-70 Impala with manual factory air-conditioning.
NOTE - Cars with ATC (Automatic Temperature Control) use a different heater box to accommodate installation of the power servo.

March, 2022

1965-67 Pontiac GTO, LeMans & Tempest A/C Heater Box

A new aluminum heater coil was installed.
The metal housing has bead-blasted & repainted.
The fiberglass housing was restored to it's original finish.
The foam door seals on the main door was replaced.
Both vacuum actuators were cleaned and tested to function correctly.
For the most part, these units are the same from for 1965, 1966 & 1967 GTO, LeMans & Tempest with factory air-conditioning.

April, 2023

1987 Chevy Truck A/C Heater Box

A recent rebuild of Dylan T's 87 Chevy truck a/c heater box.
As is often the case with the mid 1985 & newer square body trucks, this unit was damaged when someone tried to replace the heater core, (These are VERY tricky to disassemble without damaging!) and the inner housing was literally broken in half. We fixed it, cleaned & tested the actuators, restored the rest of the housing, installed a new diverter door deal and calibrated so doors function correctly.
For the most part, this unit with the plastic vacuum actuators is correct for 1986 & newer square body trucks.

HEATER CONTROLS (A/C & HEAT)

VALVES

December, 2022

1961 Buick A/C Hot-Gas Bypass Valve

Also called a suction valve, suction throttle valve, POA valve and other names, this is the piece that mounts beside the a/c compressor, in the engine compartment.

Its function is to regulate pressure to insure the evaporator coil does not freeze.

The exterior metal components were zinc-plated.
New O-rings and internal diaphragms have been installed.

Built to be used with the old R12 refrigerant, but can be calibrated for the newer 134a refrigerant during the charging process.
This is done by removing the lever and using a specialized tool to adjust the nut inside the shaft to get the low side reading to 20psi.
(The old R12 would be set at 30psi.) This can only be done once the full charge of refrigerant has been added to the system. We cannot provide this tool.

TECH NOTE - The main causes of failure of these valves is moisture and/or contamination in the system.
If your a/c system is not thoroughly flushed clean, the oil is not changed in the compressor and the filter-drier is not replaced or rebuilt, this valve will fail prematurely.
This is a one-year only part for 1961 Buick with factory air-conditioning.

September, 2021

1963-66 Chevy Corvette A/C Suction Throttling Valve (STV)

Also called a suction valve, suction throttle valve, POA valve and other names, this is the piece that mounts on the top fitting of the evaporator unit, mounting on the passenger-side firewall.

Its function is to regulate pressure to insure the evaporator coil does not freeze.

The entire valve has been dismantled, cleaned, a new internal diaphragm and valves stems were installed, reassembled and pressure tested. The vacuum valve was tested for proper function.

This valve is exceptionally rare, fitting only 1963-66 Corvette with factory air-conditioning.

Built to be used with the old R12 refrigerant, but can be calibrated for the newer 134a refrigerant during the charging process.
This is done by removing the cap, adjusting the rod inside with a flat-head screw driver to adjust the low side pressure to 20psi. (The old R12 would be set at 30psi.)
This can only be done once the full charge of refrigerant has been added to the system.

TECH NOTE - The main causes of failure of these valves is moisture and/or contamination in the system.
If your a/c system is not thoroughly flushed clean, the oil is not changed in the compressor and the filter-drier is not replaced or rebuilt, this valve will fail prematurely.
This is a one-year only part for 1961 Buick with factory air-conditioning.