1993 Ford Probe Temp Control: Solving A/C vs. Non-A/C Compatibility and Failures
This guide covers the common failures, critical part number differences, and replacement tips for the 1993 Probe's climate control unit.
- You MUST match the part number from your original unit. There are different parts for cars with factory A/C (F32Z-19980-A) and without (F32Z-18549-A).
- The most common cause of failure is cracked solder joints on the circuit board where the main electrical plugs connect. These can often be repaired with basic soldering.
- Used OEM units are the most common replacement option, typically costing $40-$75. Check for part number match and physical damage before buying.
- This part is shared with the 1993 Mazda MX-6, which can expand your search for a used replacement.
Critical 1993 Compatibility Warning: Factory A/C vs. Non-A/C
The single most important factor when replacing the temp control unit in a 1993 Ford Probe is identifying whether your vehicle was built with factory air conditioning or not. Because 1993 was the first year of the second-generation Probe, which shared its platform with the Mazda MX-6, there were variations that make part matching essential.
Warning: The two main units for the 1993 model year look nearly identical but are not interchangeable. Installing the wrong one will result in the A/C system not functioning correctly, or at all.
- For Probes WITH Factory A/C: The correct OEM part number is typically F32Z-19980-A. A known superseding or alternative part number is F42Z-18549-C, which was also used on 1993-1994 Probes and Mazda 626 models.
- For Probes WITHOUT Factory A/C: The correct OEM part number is F32Z-18549-A. This was also sometimes used in cars that had A/C added at the dealership rather than at the factory.
Before ordering a replacement, you must verify the part number on your original unit. This often requires removing the center console trim to access the sticker on the control unit's housing.
Common Symptoms of a Failing Temp Control Unit
Failures in these units are almost always electrical. You may notice one or more of the following symptoms:
- Unresponsive Buttons or Knobs: Pressing the A/C button or mode selectors does nothing. The fan speed or temperature sliders may not cause any change.
- Fan Speed Issues: The fan may be stuck on one speed or not work at all. However, if the fan only works on the highest setting, the problem is more likely the blower motor resistor, not the control unit itself.
- Incorrect Airflow: You select the dash vents, but air only comes out of the defroster, or vice-versa. This means the unit is failing to send the signal to the mode door actuators.
- No Backlighting: The lights that illuminate the controls at night burn out or have an internal electrical fault.
- Intermittent Operation: The controls work sometimes but fail at others. This often points to a failing electrical connection or cracked solder joint inside the unit.
Buying a Used 1993 Probe Temp Control: What to Check
Since new OEM units are discontinued and specific aftermarket replacements are not available, buying a used OEM part is often the only option. Here’s what to look for to ensure you get a good one.
Step 1: Verify the Part Number
This cannot be stressed enough. Ask the seller for a clear photo of the part number sticker on the housing of the unit they are selling. Compare it directly to the number on your original part. A unit from a 1993 Mazda MX-6 with a matching part number will also work.
Step 2: Physical Inspection Checklist
If you can inspect the part in person, or can get detailed photos from the seller, check the following:
- Circuit Board Connectors: The most common failure point is cracked solder joints where the main electrical connectors are soldered to the circuit board. Look for fine, circular cracks in the solder around the base of each metal pin. The solder may look dull or fractured compared to other joints.
- No Burnt Spots: Examine the circuit board for any black or brown spots, especially around the larger electronic components. This indicates a short circuit or overheating that has likely damaged the board beyond simple repair.
- Slider and Knob Feel: The sliders for temperature and fan speed should move smoothly without grinding or excessive resistance.
- Housing and Mounts: Ensure the plastic housing and all mounting tabs are intact and not cracked or broken.
Pro Tip: Many "dead" control units can be fixed. If you have basic soldering skills, you can often repair a faulty unit by simply re-heating the solder on the main connector pins to fix the cracked joints. This is a very common issue on 1990s automotive electronics and can save you from needing to buy a replacement.
Cost Comparison
The 1993 Ford Probe is a classic, and parts availability reflects that. Here is a breakdown of what you can expect to pay for a replacement temp control unit.
| Part Type | Estimated Cost | Notes |
|---|---|---|
| New OEM | $100 - $250+ | Extremely rare. Only available as "New Old Stock" (NOS) from specialty sellers or eBay, if you can find one. |
| New Aftermarket | Not Available | No direct-fit aftermarket replacements are commonly manufactured for this specific vehicle. |
| Used OEM | $40 - $75 | This is the most common and affordable option. Prices are typically from online auto recyclers or eBay. |
| Shop Labor | $50 - $185 | Replacement is straightforward. A repair shop will typically charge for 0.5 to 1.5 hours of labor. |
Replacement Overview
Replacing the temp control unit is a relatively simple job that most DIY mechanics can handle. The difficulty is about a 2 out of 5.
- Disconnect the Battery: Before working on any electrical components, disconnect the negative terminal of your car battery.
- Remove Center Trim: The temp control unit is housed in the center stack of the dashboard. You will need to carefully pry off the plastic trim surrounding the radio and climate controls. Use plastic trim removal tools to avoid scratching the dashboard.
- Unplug Electrical Connectors: Once you have access to the back of the unit, carefully unplug the electrical harnesses connected to it. There are typically release tabs you must press to pull them out.
- Unbolt the Unit: The control unit is held in place by a few screws. Remove these screws and the old unit will come free.
- Installation: Installation is the reverse of removal. Bolt in the new unit, reconnect the electrical harnesses, and carefully snap the trim back into place. Reconnect the battery and test all functions.
Known Issues, TSBs, and Recalls
There are no official recalls or Technical Service Bulletins (TSBs) from Ford or the NHTSA specifically related to the failure of the temp control unit in the 1993 Ford Probe. Any issues with the unit are due to the age and normal wear of electronic components.
Frequently Asked Questions (FAQ)
Can I use a temp control from a 1994 Probe or a Mazda MX-6?
You can use a unit from a 1993 Mazda MX-6, as it is the same platform, but you must still match the part number for A/C vs. non-A/C. Units from a 1994 Probe may also work if the part number is identical (e.g., F42Z-18549-C), but it's always safest to stick to the exact model year unless you can confirm the part number supersedes your original. Units from the first-generation Probe (1989-1992) will not fit.
Why does my fan only work on the highest speed?
This classic symptom is almost always caused by a failed blower motor resistor, not the temp control unit. The highest fan setting bypasses the resistor, which is why it's the only one that works. The resistor is a separate, inexpensive part usually located in the HVAC housing behind the glove box.
The lights on my control unit are out. Do I need to replace the whole thing?
Not necessarily. The backlighting is provided by small, replaceable incandescent bulbs. If the controls all function correctly but are just dark, you can often disassemble the unit and replace just the bulbs. However, if the display or indicator lights (like the A/C light) are out, it may indicate a circuit board problem.
Is it hard to remove the center console trim without breaking it?
It requires patience. The plastic is old and can be brittle. Use a set of plastic trim removal tools, not a screwdriver. Work slowly and apply gentle, even pressure to release the clips. Watching a video guide for second-generation Probe interior disassembly can be very helpful.
Technical Specifications
OEM Part Numbers: F32Z-18549-A F32Z18549A F32Z-19980-A F32Z19980A F42Z-18549-C KA78-61-C25 KA7861C25
Manual control unit with sliders for fan speed and temperature, and push buttons for mode selection and A/C. Operates on the vehicle's 12V electrical system.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Probe:
- Critical 1993 Compatibility Warning: Factory A/C vs. Non-A/C
- Common Symptoms of a Failing Temp Control Unit
- Buying a Used 1993 Probe Temp Control: What to Check
- Step 1: Verify the Part Number
- Step 2: Physical Inspection Checklist
- Cost Comparison
- Replacement Overview
- Known Issues, TSBs, and Recalls
- Frequently Asked Questions (FAQ)
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