Exhaust heat exchanger coolant leak.

[amschind]

The worst part is that the sole benefit from the exchanger is that the cab gets warmer slightly faster.

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[dafish]

I mean really? Cripes, bypassing it would be an everyday thing. Why aren't folks?

 

[HammaMan]

It heats up the cabin and motor both. That heat exchanger helps heat up the motor much faster than without it. That's important for the hybrid operation bringing the engine up to temp quicker so that hybrid mode kicks in sooner in cold weather. Pay attention to just how fast it heats up when cold. It also warms up the motor even in summer, it's just a much shorter cycle.

I think a good solution for summer operations is to have a variable valve that could be mostly closed. It's there enough to keep the temp sensor happy, but has the ability to shut off flow entirely if needed.

Winter is coming.

 

[UGADawg96]

It heats up the cabin and motor both. That heat exchanger helps heat up the motor much faster than without it. That's important for the hybrid operation bringing the engine up to temp quicker so that hybrid mode kicks in sooner in cold weather. Pay attention to just how fast it heats up when cold. It also warms up the motor even in summer, it's just a much shorter cycle.

I think a good solution for summer operations is to have a variable valve that could be mostly closed. It's there enough to keep the temp sensor happy, but has the ability to shut off flow entirely if needed.

Winter is coming.

 

[Snakebitten]

Most Powerboost owners would never know they have an exhaust heat exchanger if it had been built a little more robust?

Ford mechanics didn't even know what it was when they were presented the first leaker.

 

[dafish]

hmm,

My SxS has a liquid to air intercooler and a oil to water heat exhanger. I know more guys that own these then I do guys w/F-150s. Not a one of us has every had any kind of failure in either. Mind you I don't think there is a valve in either. No point. That said I did put of 170f thermostat in, and my oil runs a bit cooler now too.

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