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The way to tell if something is wrong check oil cap. Look for a white foam sometimes it's brown showing coolant in oil also look for white or blue smoke coming out of tailpipe. If you don't see any of these simple drain reservoir and flush it. I would also drain radiator to be on safe side. It is possible that last owner put oil in reservoir I have seen strange things like that and worse
For one the tech should pressure test the cooling system to see if it holds the "rated pressure" on the radiator cap (somewhere around 12-15 psi). If you have a leak it will loose pressure. A bad head gasket can do one of two things, (1) cylinder compression can push the coolant out of the radiator and it "should" go back into the reservoir and over fill it...but...there could be a leak in the hose that goes from radiator to the reservoir, thereby pushing it out on the ground while you are driving down the road. There may not be enough pressure to observe this at idle. (2) The coolant could be getting "sucked" into a cylinder and getting burnt up and sent out the exhaust, eventually plugging up your catylatic converter, which inspecting the spark plug tips would show you a brownish color. And at last the coolant could be seeping out of your heater core and getting your carpet wet inside the car. I am not sure where your heater core is located on this vehicle although this can happen.So first thing it to have it pressure tested and maybe you will see it leaking.
Hi, Check the radiator cap seal. If the radiator cap is not sealed the vacuum pressure that suppose to s_uck back the coolant from reservoir will not work. Better buy/replace that radiator cap with original specs.
One thing to check is for coolant getting into the oil, which would indicate head gasket failure. Check oil dipstick and/or underneath of oil cap for a frothy brown/tan look to it. If so, do not drive the car.
Also check coolant reservoir for a leak. Evaporation is suspect, but maybe not to the point you are describing. Check coolant reservoir cap, as well as radiator cap.
It sounds like you're having a few problems. The "oil in the coolant reservoir" issue could be due to a blown head gasket, which is a common issue on Dodge/Chrysler V6 engines. Also, because of damage to the radiator, there could be a coolant leak or you could have air in your cooling system. I would have that looked at and/or replaced after having the head gasket checked.
Here is the way to find out pull your spark plug put out and bring each cylinder tdc and put 50 psi air in that cylinder remove radiator cap and check for bubbles do this to all cylinders,if no bubbles I would be checking to see if that engine has a oil cooler that could leak oil into your coolant,some mercededs had oil cooler,
either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.
Twice in two years now my Saab 9-5 has had a pin-hole in the oil cooler, which has caused oil to flow into the reservoir. A way to tell is if coolant/oil is coming out of the reservoir cap. The reservoir cap is rated for the pressure of the coolant system, which is significantly lower than the oil pressure. When there is a hole in the oil cooler, oil will be forced out at relatively high pressures, causing the reservoir to fill and then over pressurize and spill out of the cap.
Most probably you have bad head gasket. That is the main reason for oil getting to coolant.
Check you exhaust for color. White color can be also idiction that coolant going to combustion chamber.
Hope that was helpfull