this post was submitted on 10 Aug 2023
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2012 Ford Focus, 155K miles, it is leaking a decent amount of coolant when my partner drives it to work but doesn't even leak a drop if I drive it to work. The mileage is the same but I don't sit in traffic. Could the extra heat from sitting in traffic be opening up a pinhole sized leak in the coolant line?

Edit: Thanks to a tip from the comments when the heat is turned on it leaks. I should be able to bypass that line pretty easy.

Thanks [email protected]

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[โ€“] [email protected] 39 points 1 year ago (11 children)

Any chance your partner uses the heater and you don't? Many cars have a heater core bypass valve that only allows coolant into the heater core when the heat is on in the cabin.

[โ€“] [email protected] 30 points 1 year ago (3 children)

Thanks! I tried this, and it leaked. The issue is at the heater core. I'll putting together a bypass to the line that is leaking now.

[โ€“] [email protected] 1 points 1 year ago (1 children)

So you are breaking the heater in your car and removing the defroster a safety feature? Just replace the heater core..

[โ€“] [email protected] 11 points 1 year ago

This is to get it to stop leaking coolant until I can change the heater core.

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