CSF Porsche 964 / 993 OEM+ Performance A/C Evaporator

Dual-Core Parallel-Flow A/C Evaporator Built for the Porsche Air-Cooled Era

The CSF 8368 is a purpose-built OEM+ performance A/C evaporator designed as a true plug-and-play replacement for the 1989-1994 Porsche 911 (964) and 1995-1998 Porsche 911 (993). CSF 8368 addresses a fundamental limitation of the original factory evaporator: the OEM serpentine-tube design was engineered around R12 refrigerant, and its cooling efficiency drops significantly when converted to modern R134a. CSF solved this with a parallel dual-core design featuring super-high pressure 26mm 12-channel microtubes and multi-louvered fins, delivering substantially more cooling surface area than the OEM unit while actually measuring 15mm slimmer at 52mm total core thickness versus the factory 67mm. The dual-core layout packs 13 cooling tubes and 14 fin rows in the front core plus 11 cooling tubes and 12 fin rows in the rear core, totaling 24 rows of tubes paired with 25 rows of 8mm tall multi-louvered fins. The 8368 ships with OEM-style inlet and outlet connections, pre-installed foam seals, and all hardware including the bracket for the OE expansion valve, requiring absolutely no modifications for installation. 100% aluminum construction with a satin black anti-corrosive powder coat finish and a 2-year limited warranty round out a unit that restores proper A/C performance to these classic 911 platforms without compromise.

Key Features

• Parallel dual-core design far more efficient than the OEM serpentine tube evaporator, especially on R134a systems
• Super-High Pressure 26mm 12-channel microtubes for optimal refrigerant flow and maximum surface area contact
• Front core: 13 cooling tubes and 14 fin rows; rear core: 11 cooling tubes and 12 fin rows
• 52mm total core thickness; 15mm slimmer than the factory OEM unit (67mm) for improved fitment
• 25 rows of 8mm tall multi-louvered fins versus OEM flat fins for dramatically increased heat exchange efficiency
• 100% aluminum construction with anti-corrosive satin black powder coat finish
• OEM-style inlet and outlet connections for direct fitment; no modifications required
• Pre-installed foam seals included for best possible evaporator-to-housing seal
• Includes all hardware and bracket for attaching the OE Porsche expansion valve (96457312305 or 96457022300)
• 2-year limited warranty

Vehicle Fitment

Specifications

What's Included

• 1x CSF 8368 Dual-Core Parallel-Flow A/C Evaporator
• Hardware kit and bracket for OE expansion valve attachment
• O-ring kit
• Pre-installed foam seals

Frequently Asked Questions

The 8368 fits 1989-1994 Porsche 911 (964) and 1995-1998 Porsche 911 (993) variants including Carrera 2, Carrera 4, Carrera 4S, Carrera S, RS America, Targa, Speedster, and Turbo models. See the full fitment table above for year-specific trim coverage.

The factory evaporator was designed around R12 refrigerant, which has a higher latent heat capacity than R134a. When the system is converted to R134a, the original serpentine-tube evaporator cannot transfer heat efficiently enough to compensate, resulting in poor cooling output. The CSF dual-core parallel-flow design in this evaporator specifically addresses this by doubling the effective cooling surface area and using modern microtube geometry that works with R134a system pressures and flow characteristics.

No. It is a true drop-in fit. The OEM-style inlet and outlet connections align with the factory A/C lines, the included hardware reuses the OE expansion valve bracket, and the pre-installed foam seals mate directly to the factory evaporator housing. No cutting, drilling, or fabrication is required.

Yes. It is compatible with both R134a and original R12 systems. The parallel-flow design performs well with either refrigerant, though the efficiency gains are most significant on R134a conversions where the factory evaporator typically underperforms.

This unit includes the bracket for attaching the OE Porsche expansion valve. Compatible Porsche expansion valve part numbers are 92857312305 and 92857022300. Reuse of the existing OE expansion valve is supported; replacement is not required unless the existing valve is faulty.

This unit replaces Porsche OEM part numbers 96457390100 (964-573-901-00) and 96457301300 (964-573-013-00). Cross-reference these against your specific chassis before ordering to confirm the correct application.

The factory OEM evaporator measures 67mm in core thickness. This dual-core unit is 52mm thick, which is 15mm slimmer. Despite being more compact overall, the parallel-flow dual-core architecture provides significantly more cooling tubes and fin rows than the factory serpentine design, resulting in better thermal performance in a smaller package.

Yes. Any time the A/C evaporator is removed, the refrigerant must be recovered by a certified technician before disassembly and the system must be evacuated, leak-tested, and recharged with the correct refrigerant charge after installation. Professional A/C service is required and is not a DIY procedure in most jurisdictions.

Yes. The white flakes commonly found in 964/993 A/C vents are caused by degradation of the foam coating on the original evaporator fins breaking down over time and entering the cabin airflow. This unit uses modern louvered aluminum fins with a durable powder coat finish, eliminating the foam-fin construction that degrades in the original unit.

This unit is backed by CSF's 2-year limited warranty against defects in materials and workmanship from the date of purchase. Warranty coverage requires proof of purchase and installation by a qualified technician.

Installation Notes

1. Have the A/C system refrigerant professionally recovered before beginning disassembly; do not vent refrigerant to atmosphere.
2. Remove the dashboard and HVAC box as required to access the evaporator housing per the Porsche 964/993 workshop manual procedure.
3. Disconnect the A/C lines from the evaporator inlet and outlet fittings; cap lines immediately to prevent moisture contamination.
4. Remove the OE expansion valve from the factory evaporator and set aside for reuse.
5. Remove the factory evaporator from the housing.
6. Install the OE expansion valve onto the new evaporator using the included bracket and hardware.
7. Verify the pre-installed foam seals are seated correctly before inserting the evaporator into the housing.
8. Connect the A/C lines to the evaporator inlet and outlet fittings using new O-rings from the included kit; do not reuse the old O-rings.
9. Reassemble the HVAC box and dashboard per the workshop manual procedure.
10. Have the A/C system evacuated to remove moisture and air, then leak-tested before recharging.
11. Recharge with the correct refrigerant type and charge weight per the vehicle specification.
12. Verify A/C system operation and vent temperature before returning the vehicle to service.