Oil in coolant

[FordMan1014]

Alrighty, i just recently flushed my whole coolant system in order to install a circulating coolant heater... This morning before i started her up for the day i decided to check fluids and my oil didn't register on the dipstick and when checking coolant i found out were all of my oil went!!! Any idea of how to track down my problem? Thanks Justin...

 

[mabc926]

Oil cooler seal I'd guess.

 

[mabc926]

How did you hook up the coolant heater?

I've been thinking about taking out the block heater on my truck and putting a freeze plug back in it's place, then running an inline heater.

 

[FordMan1014]

heater core hoses

 

[Dsl_Dog_Treat]

Oil cooler seal I'd guess.

That that too on my friends truck till I pulled the cooler off and pressure tested it.
Nope, found a bad head gasket instead.