engine coolant become hot quick but no heater!
 

I change the radiator today,after I put the new one( actually not new one, it is a used one) in I did a test drive on the high way, but the coolant temperature goes high after 9 min about 60 miles/hour so I shut the car down and restart again, the Temperture drop to half and when I start drving it, Temperture goes high again and I DON'T have heater, I used to,I have heater before I change the radiator.

I touch the radiator, it's hot so it means the thermosta is good maybe... but the problem is the coolant in the raservior is cold....

The reservoir being cool doesn't mean too much... it's in the coldest place under the hood with cold air blowing past it full time.

Are you losing coolant?

Thanks, I didn't see any steam or leak, I will check the coolant level, I lose some coolant when I was disconnecting the lower radiator hose, maybe it is the problem.

make sure u got know air in the system... by the sounds of it u have air in it somewhere

Your best bet to get rid of the air that's most likely in your system that I use, put your car in a driveway, or elevate the front of the car with ramps or jack stands, either way. open the radiator, turn the heater all the way up, start the car and fill the radiator. This allows the water to flow through the heater core and the water pump does the work for you in passing the air through the system.

The point is that you want the radiator fill point to be the highest point in the system so the air gathers there ya know? Good luck.

do you hear a gurgling/running water sound from behind the dash? could also sound like a squeeky hamster wheel gone awry... that's a good indication of air in the heater hose and thus air in your cooling system. However, given the fact the radiator was installed and the issues began at the same time, I'd have to guess you may have installed a clogged radiator. When it's cold, pop the radiator cap off, run the car... check to see if you see the coolant moving, indicating the coolant is moving thru.

Also, why did you replace the radiator? were you having issues with cooling before hand? maybe the issue didn't start with the radiator but could be a faulty water pump, thermostat or something more severe... hopefully you're not blowing smoke out of your tail pipe...

Finally, guess it could just be coincidence your heater's vacuum valve isn't working any more... preventing water from even flowing through your heater hose.

I fixed the problem, the main reason is heater core is kind of clogged and coolant also a little low