4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

Leaking Heater Core?

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Old Jul 13, 2025
  #1  
aner's Avatar
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Leaking Heater Core?

Hey all sorry if this is the wrong thread but just wondering if you guys could help me out with diagnosing a leak I am having some trouble with. I have what seems to be a coolant leak coming from right under the plastic box that the A/C Evaporator sits where the A/C condensation usually drips out, only with 10x more volume. I say what seems like a coolant leak because my truck is running water atm instead of traditional coolant so I am not sure if theres something causing excessive condensation to drip or if maybe the heater core is leaking and somehow making its way into that area? the dripping speeds up with the speed of the hvac motor but even turned off completely it still drips pretty aggressively. I am stumped here because from what I have read a leaking heater core would most likely leak into the passenger side of the cab, and I am 100% sure its not a hose from above in the engine bay. if anyone has any ideas or has seen something similar id love to hear some suggestions. I have inserted a pic of the leak.

 
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Old Jul 14, 2025
  #2  
Georgeandkira's Avatar
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From: Hackensack, Nj
What year / engine and how many miles?
Also, please pan back and post another picture to show where your close-up is.

Sure seems to be a heater core leak.
 
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Old Jul 14, 2025
  #3  
RoseBud68's Avatar
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From: PSL FL
Pull the two heater hose that connect to your heater core and bypass them with an elbow fitting.
 
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