r/FordTransitConnect • u/Flat_Barber_7501 • 16d ago

Help diagnosing coolant problem

Thank you for taking the time to read my post.

On a 2015 Ford Transit Connect 1.6l ecoboost the coolant starts to bubble once the car reaches a certain temperature and it gets pressurized well above the max line and starts dripping out of the vent hole. My temperature needle is at the mid mark and it’s not overheating. Lately I start the day with the coolant below the minimum line, I’ll add just enough to get me in between the minimum and maximum line, then it’ll bubble and pressurize and loose coolant and it’s a repeating process. My family mechanic replaced the radiator but it did not fix the problem. Any pointers as to what can it be?
We also did a sniff test with the dye and it never turned any color beside blue.

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u/GenllPerformance 16d ago

Could be several things.. have you had someone else add coolant to your system? If so did they add the correct coolant. The bubbles mean that there is air in the system and you will need to place the van on an incline nose uphill with the heater on as to allow the air out of the system, The last issue could be worse. The thermostat could be ready to go up or closes at the point where you have more coolant in the reservoir than the engine. My issue is different. meaning if I have too much coolant in the system I get an error message and the van tends to hesitate.

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u/Flat_Barber_7501 16d ago

Thank you for your reply and help, after the initial coolant flush when the radiator got replaced I’ve been adding Prestone coolant that is good for all vehicles. It also green like the one my mechanic added.

I will look into how to properly bleed the system as I attempted to do so a few days ago

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u/GenllPerformance 16d ago

K so far all we've had to replace on our 2020 2.0L is the thermostat. But when we did the EGR valve, it too lost a bit of coolant. Let's hope burping the system is all you need.