I have a 98 deville with 39,000 miles on it and i recently replaced the water pump and thermostat. it runs great but my temperature rises to about 222 degress when im just idling but then drops down to 196 and it keep fluxuating between those degress when im idling. and sometimes i smell coolant when im driving. i checked for leaks and i couldny find one. there is no oil in the coolant and there is no coolant in my oil. can some one help me out on this one!