okay i just put a new camshaft in my truck and before my water pump seemed to work but it leaked a little bit but my truck never got hot well i drove it a little bit after puting in the new camshaft and the top radiator hose and heater hose was warm but the bottom radiator hose was cold so i think my water pump went out but not to sure thanks to any answers
when your water pump goes out, either it will leak from the weep holes which are the holes drilled in the pump by the manufacturer or around the pulley. If that is happening then its your pump. The other thing to check would be your thermostat, check this by turning your truck on and leaving the lid of the radiator. check the temperature of the water in the radiator with your finger if it warms up in ten minutes then its not your thermostat, if the water level goes down ( like lack of water) then its the pump.
I would check the thermostat. But you don't check it like the first answer indicates. Pull the thermostat out. Look at it if it is open it is bad. If it is closed put it in a pot of boiling water. If it does not move it is bad. This may seam like allot to go through but if it is not the thermostat your only out the cost of a new gasket. And you know for sure. If there is nothing wrong with the thermostat , than you aren't getting circulation. A few causes would be: Cooling system clogged water pump bad internal leak or external leak. If you have a leak the system can't build pressure.It will take a long time to warm up and or it will make you think it is over heating but it will only be a leak. It will also run hot. NEVER OPEN A RADIATOR CAP WHEN THE ENGINE IS HOT. YOU WILL BE GOING TO THE HOSPITAL TO HAVE YOUR BURNS TREATED!!!
