95 suburban reaches operating temp.(200)and then drops down to 180 while driving, but creep back to 200. The bottom radiator hose is cold while all the other hoses are hot. I checked the oil to see if there was anti-freeze or anything else. Dropped some oil on the hot manifold and it smoked(good sign). I also have very light gray smoke coming from the exhaust, but goes away once truck reaches operating temp. I have no hesitation nor does it stumble when i hit the gas to go. I have changed out the spark plugs and wires,rebuilt the TBI, replaced the injectors and regulator,the coolant sensor near the thermostat, replaced the heater core and flushed the coolant system and not I'm stumped trying to figure out what is causing my temp. gauge to fluctuate, or is this normal for this old truck saying she old?
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2 yr old radiator, value craft 195 thermostat, and I'm assuming a good fan clutch, but my question is, why is the bottom hose cold when I'm at operating temp.? could this be the cause? plus all my hoses seem like they have no anti-freeze in them but when i squeeze them the over flow tank anti-freeze does move. I'm stumped and I do believe I can fix this myself with everybody's input.
yes, replaced the thermostat also.
Drive it!!!!