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New Member, tracing coolant loss

VelociRanger

New Member
Joined
July 4, 2021
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City, State
Royse City
Year, Model & Trim Level
2002 Explorer Eddie Bauer
I own a 2002 Ford Explorer with the 4.0, it has 190k miles. I’ve been trying to diagnose a coolant leak for a while. At first it would start to over heat occasionally so I replaced the thermostat, but noticed I didn’t drain the correct amount of coolant from it, then watched the reservoir level and noticed it would drop after a couple days. I found the heater hose T connection was cracked and spewing coolant, so I replaced it. Then we started losing coolant again, so I pressure tested the radiator cap and it didn’t hold pressure so I got a new cap. Reservoir stayed full for a while, no issue. Now suddenly it’s losing coolant again, with no visible leaks. Oil isn’t milky, no smoke on start up, no rough idling, no signs of head gasket other than losing coolant. Any help would be appreciated, thanks.
 


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Mike65

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Welcome to the forum. Check for any signs of a leak at the thermostat housing, they are famous for leaking.
 




BrooklynBay

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Josef161

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It could be the coolant reservoir cap ($5-10) or the water pump.
 




Mbrooks420

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It could be the coolant reservoir cap ($5-10) or the water pump.
How do you lose coolant from the reservoir cap? The radiator cap was replaced as noted in the original post.

I agree with BrooklynBay, it’s time for another pressure test.
 




Josef161

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How do you lose coolant from the reservoir cap? The radiator cap was replaced as noted in the original post.

I agree with BrooklynBay, it’s time for another pressure test.
Maybe it's the same thing, I've never seen a radiator cap in my explorer. But the cap on the coolant reservoir is supposed to open if the pressure reaches a certain level and i have heard that the spring in the cap can get weak over time and then it opens up too early, this can couse steam to escape. That's how my understanding, is that right? And i didn't read that he changed his radiator cap...
 




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