Overheating while driving on the highway with A/C on?

1993 FORD E-SERIES VAN

1,504,748 MILES • 5.8L • V8 • 2WD • AUTOMATIC

HUDSONJ

MEMBER
1 POST

Our van, 1993 Ford E-150 Econoline, is only overheating on the highway when the air conditioner is going. If the heater is on it does fine. Thermostat has checked out fine. We flushed the radiator; spark plugs have been replaced along with some hoses. Could the air conditioner be bad? It doesn’t seem to turn off at all (constantly running when on).

Jul 16, 2022 at 3:37 AM

STRAILER

✓Experienced Mechanic
55,273 POSTS

When the engine is overheating can you hear the fan clutch engaged? If not, this is your problem, here is a guide that can help as well, and I have included how to change the fan clutch out in the diagrams below:

https://www.2carpros.com/articles/engine-overheating-or-running-hot

and

https://www.2carpros.com/articles/fan-clutch-removal

REMOVAL AND INSTALLATION
1. Remove fan clutch from water pump pulley by removing the four bolts holding the fan blade and fan clutch assembly to the water pump.
2. Remove fan shroud retaining screws.
3. Remove fan blade, fan clutch and shroud.
4. If fan blade and clutch must be separated, remove remaining bolts attaching fan blade to fan clutch.
5. Reverse procedure to install. Torque fan blade to fan clutch attaching bolts to 12-18 ft lb.

Make sure to use a high-quality replacement part. Check out the diagrams (below). Please let us know what happens.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Jul 16, 2022 at 12:03 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.