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Locating a coolant leak, making a hissing sound.

Matt98svt

Member
Joined
November 26, 2016
Messages
15
Reaction score
0
Year, Model & Trim Level
2007 Eddie Bauer v6 4.0
Ok so I have a 2007 EB 4.0L that has recently sprung a coolant leak. i just noticed the coolant smell with the car running tonight before I changed the oil. When I looked under the hood there was coolant slung all around the front of the motor where the fan has spread it . I replaced the thermostat housing about a year ago and it seems fine, no coolant around it or in the intake valley. The radiator I replaced with one from amazon about a year ago too after the factory one cracked where ford uses the cheap plastic tops on the 4.0 radiator. As far as I know the water pump is original. When I turn the car off I can hear a hissing sound for about 15 seconds which I figured would take me right to the source but it is allusive. The fan shield is so tight I can’t tell where it is coming from. I get underneath the car but dont see any steam and again can’t pinpoint the source of the hissing. Any tips to help locate a leak like this?
 




MotorCityFats13

Explorer Addict
Joined
January 25, 2015
Messages
1,080
Reaction score
75
City, State
Flatrock MI
Year, Model & Trim Level
2007 Explorer XLT 4.0L
the last time this happened to me it was the tiny 2 inch hose under the housing and the manifold.... i think its called the by pass hose
 




96eb96

Explorer Addict
Joined
October 20, 2004
Messages
3,402
Reaction score
221
City, State
Albany, NY
Year, Model & Trim Level
96 EB V6 OHV 4WD
Advance auto rents a pressure tester with a deposit. Pressurize to 21 psi. (I believe these are 20 psi cars)
 




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