Howdy all!!
I have a 95 GMC 2500 with a 6.5 turbo in it and Ive had it about three months now and have learned a bit on it but not as much as I would like. My problem I'm having with it now is that its just started blowing alot of bluish white smoke and it over heats when driving it while its smoking. Could it be a blown head gasket even though you cant realy smell coolant in the exhaust? Could someone help me please?

 

Have you checked to see if there is any oil in the water or water in the oil?

 

Another symptom is fluctuating heater temps.

 

along with checking for fluid transfer water/oil also check to see if you are getting bubbles in the radiator! and remember dont open the radiator when it is hot!
I would say the problem is head or gasket related though!