Within the last 6 months I have replaced the water pump, flushed the system, replaced the thermostat and replace the coolant temperature sensor. When the car overheats the right radiator hose is very hot and the and the left water pump radiator hose is cool to the touch. Obviously that sounds like a circulation problem and maybe a bad thermostat. Yet that would be the second one in a row since it was previously replaced by an auto shop. Another symptom I get is that front heater controls only blow cold air and the rear heater control blow intermittent warm air.
The first thing I would verify is that there are no air pockets in the cooling system. It can look full but actually have air in the system from being drained.
The next thing would be circulation thru the radiator. Then a blockage in the radiator hose or the block.
SOURCE: The heater only blows luke warm air. Just replaced
Hello...
One of 3 things could cause this, that I know. The thermostat has been installed backwards. The water pump broke soon after install. Due to it being a rebuilt one. And a small clog in the heater core. All of these things are easy to fix.
Good Luck...
SOURCE: heater blows cold air 1995 plymouth voyager
With the engine cold & the radiator full remove the radiator cap and start the engine. Let the engine reach operating temperature which will open the thermostat. When it opens the water in the radiator will start circulating if the pump & thermostat are operating properly. If all is ok replace the cap and turn the temperature lever on the heater to hot If you still have no heat check the heater valve on the engine firewall. Open it manually and see if you have heat. If yes check the cable from the velve to the temperature lever.
SOURCE: No heat from the heater
check this site out !! http://www.automotix.net/partshotline-do...
your heater control valve might be faulty also. have a good day !!
SOURCE: no heat blowing from air
GMC? this is backwards,top hose should be hot,bottom cold,sure it's not a reverse rotation pump,98-99 used 'em, not sure what year you have but the reverse pump will bolt up to any of 'em .Just a thought
SOURCE: 2006 CHEVY COBALT OVERHEATING HAS NEW RADIATOR WATER PUMP AND THERMOSTAT
That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.
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