hey everyone, i have a 04 Pacifica AWD.
First what happen was i was driving it and it started to get warm, i stopped and when i did there was coolant comming out of overflow, and it busted the heater core, when i let it cool off i check the coolant and there was signs of oil in it. i filled it back up with coolant to get it home and drove it 2 other times and there is oil in the coolant, but it does not get hot at all and i drove it for about 20 mins in stop and go traffic and never got warm at all, i checked the oil and no signs of coolant in the oil. Most of the time i would think it was a head gasket, but i did have a issue on a GM i had and it was a intake gasket that was bad, i am not real familiar with the pacifica so any help would be great. So right now i can drive it no issues other then oil residue in the coolant tank. No coolant in the oil.

thanks for the help.

 

I also have a 2004 Pacifica (FWD). I discovered last week that my coolant tank had oil in it. Like you, there was no coolant in the oil. Turns out these cars have an oil cooler which ties into the radiator I think. I had mine replaced and all is good.

 

thanks for the info, i actually just change it yesterday, so i am hoping for the best...

 

I realize its been awhile since your post, but I'm having the same issue with my Pacifica and I was wondering if changing that oil cooler took care of your problem.

Thanks for any help
John