Q:Mercedes 2000 ml 320. I changed radiator and water pump now car only runs half as worm than it used to. So now heat blows cold to little warm depending on how cold out side

Definitely check your thermostat out...

Q:I just noticed a slight leak from my water pump. About the size of my fist. I called one mechanic and was told the 2001 BMW Z3's water pump seals are tight and do not leak with the car is running (engine is hot) but once the car cools the water pump seals expand resulting in the small leak, that I shouldn't worry about it unless it leaks more, the engine over-heats, or dash light turns on. The BMW said I should have the water pump replaced but he may have just said that to make a repair sale. Anyone out there know the truth?

on that car the miles are critical for water pump replacement and maybe rad replacement including the t/stat and hoses//you are already over the time period/coolant system failure is imminent

Q:I just replaced my submersable well water pump, the wire that connects the pump, the d switch, and the water tank. Everything was installed correctly and with the help of a licensed plumber. While the D switch is closed (providing power to the pump) the pump will run for about 5 seconds then shut off for about one minute. It will continue this process until the system attains proper pressure and the D switch will open, shutting off power to the pump. The pump is brand new. Why, when power is being supplied does the pump cut on and off? We have tested the current at the well head and it shows that 230 is being supplied the whole time that the D switch is closed, which is correct.

make sure your pump is wired 220vac. you need to restrict the flow coming out of the discharge of the pump when you are filling tanks/waterlines. Once everything is full and the pump is running at operating pressure it should quit turning off. as said above it is the thermal overload protector in the motor shutting it off. The more GPM you move the more current it pulls, current=heat. restrict it by turning your valve down by half or more.

Q:How can I test to be sure my water pump is working before I go to the lake and burn up my motor. `72 65hp johnson. thank you.

You have essentially two correct answers, but looking at the year of your engine I would like to add some clarity. If memory serves, the 1972 engine doesn't have what we today think of as a tell-tale. Meaning that nice little stream of water that comes out of a tube on the starboard side of the engine. Using my poor memory I believe there is and exhaust port, usually one or two outlets together, centered in the rear of the engine, just below the fiberglass engine cover, maybe a little lower. And again, if memory serves, water doesn't flow in a stream from there, but kinda comes bubbling/spraying out. This will be the place to check for exhaust water, and whether or not the impeller is working. Also, like the idea of using the earmuffs, just in case there is thru-hub exhaust you can see it also. If the hub is in the water you can see it exhaust water.

Q:I just had the water pump replaced, now less than a week later it is overheating again and sometimes blowing cold air. What does this sound like it would be?

Hi so when was the radiator cap last changed as the spring becomes weak over time and the engine appears to boil over.so a new radiator cap usually fixes this problem.

Q:4--6 inch deep well pump head? How much per hour out of water?.

General agricultural pump 4-6 inches of lift at about 20 meters, the economic output of water is 140-200 cubic meters per hour

Q:Is it cheaper to run an electric water pump or a furnace?

heat water/pump. not sure what that is but I know what a heat pump is. If that whats your talking about thean the answer is well...yes and no. depending on cost of gas and electric typical a heat pump is better to run for heat as along as its above freezing outside. It will still work and put out heat all winter but it won't be much heat for what your paying for, at which point your better with gas heat.

Q:i have changed water pump,radiator and thermotast and it still overheat

(In addition to the above suggestions) Are the hoses good? Old hoses can collapse, blocking water flow. They should have been changed with the radiator, but not everyone does. Has the radiator fan been checked out to be sure it's working properly? If the fan isn't working properly, enough air might not get through to cool it down properly. Is it actually boiling over, or is the temp gage just showing it hot? I ask because it could be a faulty temp sensor. I'll assume that there's no debris between the radiator and condenser since the radiator has been changed out already. This should also mean that nothing is in front of the condenser blocking airflow.

Q:are there any pumps that can save energy more? Environmental protection is necessary and the price is not high.

Water pump. ( Pond ) Sump pump. ( Flood prevention ) Auto water pump. ( Radiator ) What is the specific purpose of the pump.

Q:Yesterday my car was making squeaky noises in the front and then the fan came on FULL FORCE it sounded lik an airplane. It then started to over heat. I looked to see if there was any antifreeze/coolant in it and it was BONE DRY. I found out the water pump is bad. My boyfriend wants to change it himself but he doesn't know if where it is located is so complex he should take it to a mechanic. He has changed water pumps before. If you know anything about this.. your advice is very much appreciated!!

Water pumps arent too bad to change. Just follow the hoses to the pump, should be connected to the sepentine belt. Your diagnosis seems to be correct,