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1983 - 2012 Ranger & B-Series All Ford Ranger and Mazda B-Series models

heat problem

Old Jan 28, 2024 | 08:35 AM
  #1  
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markfarris
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Question heat problem

I have a 1998 Ford ranger with a 3.0 engine. I have intermittent heat. I have a new radiator,water pump,thermostat, and have flushed the engine and heater core. Sometimes the heater hoses are hot after 30 minutes of driving and sometimes they are cold. The heater valve seems to be working. Any ideas?
 
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Old Jan 28, 2024 | 08:42 AM
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charlie g
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plugged heater core is my bet on a car or truck that old
 
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Old Jan 28, 2024 | 10:49 AM
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As Charlie suggested, a heater core is possible.
It is also possible you need to “burp” the system.
You changed a bunch of components & sometimes it is difficult to get all the air out.
Most people don’t have the equipment to pressure bleed the system & just fill-n-chill.
If you don’t get all the air out you will have pockets that can prevent adequate flow.
 
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Old Jan 29, 2024 | 04:49 AM
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charlie g
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HOW TRUE, in todays world it's best to fill using the vacuum systems out for this purpose such as https://www.harborfreight.com/automo...kit-64985.html all one needs is a air compressor ,and some time. follow the instructions, no air bound system
 
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