Hi,
Is the heater working now? I ask because if there is air in the system, that is the first place you will notice an issue. Also, is the heater putting out hot air?
Now, chances are you are correct regarding the thermostat. Since it was showing 1/4 of the way on the temperature gauge, that indicates it is working. So, the next step is the thermostat. Here are general directions for thermostat replacement:
https://www.2carpros.com/articles/replace-thermostat
Here are directions specific to your vehicle. The attached pics correlate with the directions.
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2001 Ford Truck Ranger 4WD V6-4.0L VIN E
Procedures
Vehicle Engine, Cooling and Exhaust Cooling System Thermostat Service and Repair Procedures
PROCEDURES
Thermostat
Removal and Installation
1. Drain the engine cooling system.
2. Remove the air cleaner outlet tube.
3. Remove the generator wiring harness bracket nut and position the wiring harness aside.
pic 1
4. Disconnect the upper radiator hose.
pic 2
5. Remove the bolts, water outlet adapter, and thermostat.
- Inspect the O-ring seal, install a new O-ring seal if necessary.
pic 3
6. To install, reverse the removal procedure.
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Let me know if this helps or if you have other questions.
Take care,
Joe
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Saturday, May 2nd, 2020 AT 7:04 PM