Vehicle heats up and appears that there is a blockage. I changed out the thermostat and no change. Only cold air comes through ventilation system when heat is turned on and radiator is filled
SOURCE: no hot air from heater, blower runs fine
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.
SOURCE: CAR CONTINUES TOO RUN HOT
Try this.
With the engine cool remove the radiator cap. Now start the engine and let it warm up to the point where the thermostat opens. You can usually tell when this happens by checking the temperature of the upper radiator hose, and the coolant level in the radiator. It will start getting a lot hotter quickly when it does and the coolant level should drop.
While the engine is warming up, watch the coolant in the radiator for air bubbles. Fill up the radiator as needed while continuing to watch the coolant level. Having the radiator cap off while doing this allows the trapped air to escape more easily. If you do have a large air blockage then when the thermostat opens you should see a large drop in the coolant level. You want to keep the Radiator full. Once the air bubbles seem to have stopped you can replace the radiator cap.
You may have to repeat the process a couple times if there is a large amount of air trapped in multiple pockets.
A cracked head or block you can usually diagnose as there will be a lot of small bubbles coming out constantly while the engine is warming up, and even more bubbles if you rev the engine higher as the compressed air/fuel will be forced into the cooling system.
SOURCE: i changed my water pump
Hi :) If you have a warp head and any hot gases from the pistons are being pushed back in the water jacket of the engine the engine will not get any water there to cool the cylinder wall this will over heat the engine and the only thing you can do is a head gasket change and check the heads and replace if necessary.
SOURCE: 1999 Cadillac eldorado overheating. Changed
coolant leaking into engine probably blown head gaskets. More damage will occur the more you drive it. Unfortunate and expensive repair on a northstar.
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