Check coolant level
Sounds like you have a loose or damaged hose to your heater or perhaps the heater radiator is damaged.
I had this problem before on a ranger you have to pull the dash board out and it will be right there.
same way as any other block heater... ========================================================== Your Ford Ranger block heater is just like the heating element in an electric kettle . As long as the electric block heater is plugged in to an electric outlet that has power to it , the block heater keeps on heating the engine coolant if everything is working correctly
Low on coolant, thermostat stuck open, A/C system staying on, plugged heater core are places to start.
The 1998 Ford Ranger Owner Guide shows Ford Extended Life Engine Coolant ( Dexcool )
The coolant capacity of the Ford Ranger is dependent on model year and engine type. The latest model year of the Ford Ranger was 2011. The 2011 Ranger with the 4. 0L V6 and the automatic transmission had a coolant service fill of 13. 2 quarts.
The Heater Core will be located behind the dash. Hope that Helps.
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Coolant 'sensor' for EEC purposes is near front coil on heater core hose going to thermostat housing. It's a two wire connector.
Which engine do you have?
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The price for a Ford Ranger block heater varies slightly by year of the vehicle and the retailer. As of 2014 the average price for this part is between 24.99 to 29.99.
The block heater on a 1995 Ford Ranger is in the engine space under the hood. The plug for the heater block is located near the front of the engine.
HEATER WISE? YOUR HEATER CORE MAY BE BLOCKED
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Actually , the heater core doesn't have a drain
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There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
drain coolant, disconect heater hose's, remove glove box, remove heater core cover, remove heater core. reverse order to reinstall.
Check the coolant level. My 2000 Ford Taurus has a constant flow cooling system and the heater will not work if the coolant level is too low.
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There really isn't much to it... two coolant hoses go into the firewall, and connect at each end of the heater coil. If you need instructions on how to get to it, you're better off to get a Chilton or Haynes manual.