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Well sounds like you are overfilling the tank. Secondly you would loose pressure and probably over heat if it was your cap. Also check top and bottom hoses going to radiator after it has come to operating temp. If the thermastat has'nt opened one of them will be rock hard. Perferably it be the top hose hard. Check for leaks. Also the overfill tank is going to look low at times cause the engine heats up and water flows into the radiator and when the thermastat closes it back flows back into resorvior making it look low when it is flowing. Also need more input on why this is a problem.
You should have antifreeze in the reservoir that is the over flow tank the radiator will stay full the excess will go into the reservoir tank that is normal. And it will pull it out as needed from the tank.
DROP THE TANK & REMOVE ALL OF THE WATERED DOWN GAS FROM THE TANK.USE DRY GAS IN THE TANK AS WELL & A LOT OF FRESH GAS IN THE FUEL TANK & CLEAN UP THE FUEL SYSTEM ON THE TRUCK ALONG WITH REPLACING THE FUEL FILTER BECAUSE IT'S GOING TO BE FULL OF WATER FROM BEING FLOODED OUT.ALSO DRAIN THE OIL & REPLACE BOTH OIL FILTER & OIL TOO WHILE YOU'RE @ IT.CHECK OVER ALL OF YOUR ELECTRICAL WIRING & OTHER ITEMS THAT ARE ELECTRICAL AS WELL LIKE THE STARTER / ALTERNATOR / PLUG WIRES / SPARK PLUGS / YOUR TRUCK BATTERY AS WELL WILL NEED TO BE CHECKED & REPLACED IF HAS SHORTED OUT.EVEN YOUR EXHAUST SYSTEM WILL NEED TO BE CHECKED & REPLACED IF THERE IS WATER INSIDE IT AS WELL BECAUSE THAT TOO WOULD CAUSE IT STALL OUT IF THERE IS NO AIR FLOW FROM THE ENGINE TO THE TAIL PIPE.ALSO REPLACE THE AIR FILTER AS WELL IN CASE IT IS EITHER CLOGGED OF WATER LOGGED FROM BEING IN DEEP WATER. REMEMBER IF ALL ELSE FAILS TO CORRECT IT YOU NEED TO GET IT TO A REPAIR SHOP FOR A COMPLETE CHECK OUT & ALSO TO GET IT FIXED RIGHT.
DID YOU BLEED AIR OUT THE COOLANT SYSTEM.TO BLEED COOLANT SYSTEM, FILL THE COOLANT SYSTEM THROUGH THE RESERVOIR TANK OR THE RADIATOR UNTIL THE FULL COLD MARK IS REACHED.BESURE TO USE 50/50 HALF WATER AND ANTIFREEZE.YOU CAN BUY ANTIFREEZE THAT IS ALREADY PREMIX 50/50.AFTER ADDING ANTIFREEZE TO RESERVOIR OR RADIATOR FILL RADIATOR TO FULL MARK OR IF YOU DONT HAVE RADIATOR CAP ON RADIATOR POUR ANTIFREEZE IN THE OVERFLOW JUG UNTIL COOLANT LEVEL STAY THE FULL COLD MARK.WAIT AWHILE UNTIL COOLANT LEVEL STOP DROPPING.NOW INSTALL THE RADIATOR OR OVER FLOW JUG CAP.START THE ENGINE AND ALLOW IT TO RUN UNTIL NORMAL OPERATING TEMPERATURE IS REACHED AND THE UPPER RADIATOR HOSE BECOME HOT.STOP THE ENGINE AND OBSERVE THE COOLANT LEVEL IN THE OVERFLOW JUG. THE COOLANT LEVEL SHOULD BE AT THE FULL HOT LINE.ALLOW THE ENGINE TO COOL UNTIL THE AMBIENT TEMPERATURE IS REACHED THEN CHECK THE COOLANT LEVEL IT SHOULD BE AT OR ABOVE THE FULL COLD LINE.ADD MORE COOLANT IF NECESSARY. WARNING BECAREFUL WHEN OPEN THE RADIATOR CAP OR JUG OVER FLOW CAP.USE A LARGE RAG OVER THE RADIATOR CAP TO KEEP FROM GETTING SCALDED.OPEN RADIATOR CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDED.WAIT UNTIL ENGINE COOL DOWN BEFORE OPENING RADIATOR CAP OR OVERFLOW JUG CAP.WEAR SAFETY GLASSES.
It sounds like you have an air pocket in your system. By the RH strut tower take the heater hose loose from the metal line and fill the cooling system when coolant starts coming out reconnect the hose. If that doesn't work jack the car up where the over flow tank is the highest point and fill the cooling system.
very common. The sender in the gas tank is the problem.
It will need to be replaced some day
Both my gas tanks do the same thing in my F250. 1 tank stays full all the time and the other drops from full to about a half tank when I get to half a tank and then works so so till empty.
It sounds like you have air in your cooling system, Check your coolant level and add if your low. Fill the radiator if your low on coolant and the over flow tank with GM Dex cool with 50/50 mix of water. open the radiator cap to the first click to allow the air to work it's way through out the system and out through the radiator cap and in to the over flow. Once the engine cools down, the coolant in the over flow tank will flow into the radiator, so keep an eye on the over flow tank and refill to the full mark as needed. If you have not flushed out the coolant system, you may want to. The GM Dex cool has a life expectancy of 5 years or 150.000 miles, and should be replaced. The capacity of your cooling system is 11.5 liters, good luck.