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20 minutes or so. If you have the heater core in hand it is a simple simple simple job.

First of all drain the coolant a little bit, just enough that it is out of the hoses in the heater tubes. Once that is done, remove the hoses from the heater core tubes at the firewall. Then under the dash board are 4 screws holding the bottom of the plenum on. Remove these screws and set the cover aside. Pull the heater core rearward and it will fall out.

Installation is just a matter of sliding the new core up inside and pushing the tubes through the holes in the firewall. when this is done put the cover back on, reattach the hoses and fill the radiator.

Done.

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Q: How Much Time Is Required To Change The Heater Core on A 1994 Ford Ranger?
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