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Coolant Leak - '03 Explorer V6 4.0l

  • Thread starter Thread starter IIGood
  • Start date Start date Jan 16, 2018

IIGood

Founding Member
Aug 1, 1998
4,252
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224
Churchton, MD
Jan 16, 2018
#1
  • Jan 16, 2018
  • #1
Lately I've developed a coolant leak in my 2003 Explorer with the dreaded 4.0L V6. It does produce a spot under the vehicle, right in the middle under the front of the engine. I also see some coolant pooling on top of the thermostat housing where the upper hose runs into the housing, but it seems the hose is on fairly tight. I don't see any coolant seeping out of the hose.

How likely is it that the thermostat housing is in need of replacement vs. something else such as the water pump? I had another '03 Explorer V6 before which needed it's t-stat housing replaced as it developed a crack and I know these things are fairly notorious for such a repair.

I'm hoping it'll hold off a bit longer as it is since I'm battling the unemployment monster at the moment...and then I need to address a P0430 it's throwing before it goes through emissions in the spring.
 

RaggedGT

Been here over a DECADE and still no CT
Mod Dude
Jul 20, 2014
4,739
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Taylorsville ky
Jan 17, 2018
#2
  • Jan 17, 2018
  • #2
It’s been my experience-that it’s usually the thermostat housing leaking. Sometimes it’s just the O ring leaking,but I’ve not had much luck changing them. It always fell apart when I’d separate the housing lol
 
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