Need to check the intake manifold, It is a common problem on the voretec
engines.
You have to have a computer programmer module, from O'Reily's or Autozone to reset it. Some will let you do it and some say that they are not authorized to do it. Good luck...
Either the vehicle is running low on coolant or losing pressure at some end or else the thermostat is functioning improperly or the fan clutch has got weakened. It could be a bad water pump as well.
Just buy some new section of hose, pretty cheap.
Obviously, you are losing coolant from some part of the system. Did you do a pressure check or did you simply do a visual inspection? Coolant may be lost by evaporation or you may have a gasket leak which would allow coolant to transfer to the engine oil. Check the oil dipstick after the car has run long enough to get it to an operating temperature where the thermostat has opened up. If the oil looks foamy, I would do a cylinder pressure check. If the values you get are more than 10 pounds different, I would suspect you have a blown head gasket.
"See the USA in your Chevrolet"
Some radiators have the coolant lines and the trans lines going into them. So, it may be a one unit deal.
First, where is it losing all the coolant ? Is it losing the coolant in the engine, or on the outside of the engine ? You must establish this first. What was the problem before ? Is the coolant leaking from the out side, like near the water pump, or from the large tube that goes into the water pump from the rad. hose ? Is there a problem with the thermostat ? When you replaced the pump, and put in the O- ring, did you put some silicone on the O-ring to help it seal ? Is it leaking from there. Check all the hoses and clamps and the rad. Good luck.
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Check your radiator coolant level. On some cars, low coolant will let air bubbles into the heater core which can result in intermitant cold air bursts.
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