The top radiator hose is were the hot coolant goes into the rad and the bottom provides cool to return.
If you hold your top hose while warmed up and running you can see if thermostat is open you can feel the coolant moving through. careful its hot mike
SOURCE: radiator cool, engine temp = 140
sounds like your radiator is clogged, it will bring problems to you soon, you need to flush it really good, i dont think you need to replace it but it sounds like a typical clogged radiator, have it flushed, it you cant ur gonna need to replace it soon, if you keep running that car it might lead you to a temp problem while runing and u might end up hurting your engine...
u also need to check if your thermostat is working properly. go on google and look for the procedure, ur gonna have to take it off and do a test with hot water and a thermometer and see if its working properly.
hope this helps.
have fun!
SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
SOURCE: 1991 honda accord is overheating. Installed new
When the car is completely cool,check the electric fan(s) for smooth rotation.
Clean/check/change the thermo sensor,contact and wire.
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Excavate air pocket in coolant system / check for head gasket leak
This test will kill two birds with one stone.
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MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
You will spill some coolant during this air pocket purge test.......BE
KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
Top of the coolant reserve tank
Let it ran for 10-15 minutes.
Monitor for air pockets escaping from coolant reserve tank.
Small amount of bubbles is OK at 1-5 minute mark
After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.
If you do not see any in rush of bubbles then your thermostat may be
partially stuck or rusted badly inside the thermostat hosing.
Give the thermostat host few gentle taps.
If you see larger bubbles surfacing after 15 minutes then should do a
hydrocarbon (HC) dye test to test for potential head gasket leak.
Let engine cold down and top off coolant reserve tank.
Start monitor for coolant lost
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A coolant flush is require every 2 years or 24,000 miles.
I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
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SOURCE: 1991 daihatsu applause super selection eng-HD-E1
let the car get up to operating temp and squeez the top radiator hose, if you feel the coolant squeeze out into the motor you thermostat is fine, but if you feel the hose and it feels presurized you need a thermostat. Also check to make sure the fan is operating at operating temp because that would cause overheating. ALL vehicles require the cooling system to be bled. Some have a bleeder screw (usually near the thermostat ) if not fill the radiator and keep toping it off at the coolant tank.
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