Flushing your Jeep Cherokees' cooling system every year to keep it from clogging up is a good idea. However, if your heater blower motor (or heater fan motor) has failed, you will not feel much of the heat that is flowing through your heater hoses, and it will be next to impossible to clear the ice and fog from your windshield. You may need to have the refrigerant recovered if your vehicle equipped with air conditioning, but only if there is not enough clearance to get the blower motor assembly past the accumulator.
- Skill level:
Things you need
- Fender cover
- Clean rags
- Shop vac
- Blower motor
- 3M Strip caulk
Vacuum any leaves or debris from around the blower motor housing, so it does not end up inside the heater box.
Disconnect the negative battery terminal of your Jeep Cherokee. Then, unplug the wire harness from the blower motor.
Remove the solid evaporator tube connected to the accumulator inlet. Loosen the accumulator bracket screw, leave the flexible hose attached to the accumulator and set the accumulator to the side. (Remember, this step may not be necessary. Check the clearance between the firewall and the accumulator.)
Remove the three retaining screws that secure the blower motor assembly to the firewall. Remove the assembly from the firewall by pulling the assembly straight back until the blower fan is clear of the firewall. Block the hole with rags and scrape the old caulk from the firewall. Vacuum up any debris and remove the rags from the hole.
Fix a strip of caulk around the assembly hole. Slide the blower fan into the hole. Line up the screw holes in the assembly with those on the firewall. Secure the assembly to the firewall with the retaining screws.
Replace the accumulator if it was necessary to remove it. Plug the wire harness into the blower motor. Connect the negative battery terminal. Have your A/C system recharged.
Tips and warnings
- Clean out the A/C evaporator drain hose while you have everything apart. They are famous for clogging and draining onto the interior rug. Just hold the hose with one hand and suck it out with the vacuum.
- Do not pull on the accumulator attached to the solid tube to try to make enough room to remove the blower motor assembly. This could cause a leak in your air conditioning system.
- Have refrigerant recovered by a facility certified to do so. Never remove components from an A/C system charged with refrigerant.