Hi,
If the coolant is on the floor in the vehicle, the heater core is likely bad. Here is what I would try. With the engine cold, fill the cooling system and then pressure test it. Pay attention under the dash for coolant leaking.
You will need a pressure tester. Most parts stores will lend one to you. Here is a link that explains how it's done:
https://www.2carpros.com/articles/radiator-pressure-test
If you find that coolant is coming from under the dash, here is a link that shows in general how a heater core is replaced:
https://www.2carpros.com/articles/replace-heater-core
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Here are the directions specific to your vehicle. Pic 1 correlates with these directions.
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2005 Jeep Truck Liberty 4WD V6-3.7L VIN K
Removal and Replacement
Vehicle Heating and Air Conditioning Heater Core Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
REMOVAL
Warning:
- on vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the air-bag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury or death.
- refer to the applicable warnings and cautions for this system before performing the following operation. Failure to follow the warnings and cautions could result in possible personal injury or death.
1. Remove the HVAC housing. See: Housing Assembly HVAC > Removal and Replacement
Heater Core
pic 1
2. If equipped, remove the two screws that secure the heater core in the HVAC housing.
3. Gently push back on the two heater core retaining tabs and remove the heater core from the HVAC housing.
INSTALLATION
1. Position the heater core into the HVAC housing.
2. Push the top of the heater core down until the retaining tabs lock the heater core into place.
3. If equipped, install the two screws that secure the heater core to the HVAC housing. Tighten the screws to 2 N.m (17 in.lbs.).
NOTE: If the heater core is being replaced, flush the cooling system.
4. Install the HVAC housing.
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Let me know what you find or if you have other questions.
Take care,
Joe
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Thursday, September 17th, 2020 AT 7:12 PM