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Others who have had the EGR valve issue in Gen2 have reported that it will blow the fuse (called the non-walk home fuse). The they would see high coolant temperatures. Have you checked the fuse?
 

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coolant release would be from the reservoir pressure cap which likely has a nipple and hose leading away and usually pointed downwards away from the engine.
 

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Is it possible that with the misplaced gasket coolant entered the exhaust manifold and got into a cylinder or two? That may cause misfires and high pressure and temperature. Could also cause a blown head gasket.
 

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any white smoke from tail pipe?
 

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That doesn't look too bad, maybe a bit of worry with the variation. Drain the oil and see what comes out. The definitive check is to use Block Check type tester to look for combustion gases in the coolant.
 

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Try running the block check without running the engine. Sometimes there is enough gas in the coolant that it will change even with out running. Not definitive - if it passes, you will want to run it again with the engine running. You likely have enough fluid to do it plenty of times anyway...
 
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