Water not flowing through top hose into radiator after installing new one
I just change the thermostat, water pump and heater core in a 1993 5.7 chey silverado. The radiator is only a few years old and looks clean. the water is not flowing back into radiator from the block. Top hose is cool until radiator gets extremely hot from fluid in radiator. what would make a brand new thermostat not open? I'll try it with the thermo out but was wondering if it could be something else that I hadn't thought of. Any ideas? I am also hearing the swooshing sound of the coolant circulating in the heater core. Any help is appreciated.
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Re: water not flowing through top hose into radiator...
Be sure there is sufficient coolant in the system. Not always as easy
as it sounds (Be glad it's not a fiero, they are really fun)).
Fill it as far as you can while it's running. Let it get warm, rev it
every once in a while. The level should begin to surge, let it keep
surging until it lowers before adding more water. Top it off again.
Repeat the procedure until it doesn't lower any more.
This will get rid of any air pockets. Now fill the reservoir to the indicated level.
The only other thing I can suggest is making sure the water pump is the
correct one as far as direction of spin. There should be an arrow
indicating the direction the pulley should be turning stamped on the
pump housing. Check it.
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First check and see if the fluid in the radiator is up where it should be. When was the last time the thermostat was changed? Could be no good.These things cause just warm air If the blower is working as it should you will have air flow but it your antifreeze is not warming up like it should it will be cool. .
drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.
LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.
Sounds like the thermostat is stuck open or fans running all the time (if electric). If water pump was shot, then engine would get hot, depending on the temperature where you are. Electric fans, or belt powered? If electric, do fans run all the time? If so, replace the fan relay module, which are prone to failure in Chrysler products.
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.
Remove the thermostat and run the car. Without the thermostat you should see FULL flow thru the radiator. You can pull the top radiator hose WHERE IT ATTACHES TO THE RADIATOR and start the engine with a garden hose stuck in the filler opening. Don't turn the hose on so hard that it blows water out the radiator hose. You want to water pump to shoot water out the disconnected hose, not the garden hose. A hose COULD be blocked, but it would have to be a pretty big blockage to cut off all flow. Not likely in my opinion. You could take them off and look in them and the heater hoses too. You can blow compressed air thru the heater core to see if it is blocked. As for it being the water pump...they rarely break so bad they won't pump water. Usually the seal goes bad and they leak water out the shaft. Look around, I kinda think you have a bad thermostat. Stuck closed. Drop it in boiling water and see if it opens. You didn't say what engine is in the Camaro, but most of them have a small bypass hose on the top of the water pump running to the intake manifold. Pull it off and see if water sprays out when the engine is running.
No, you just won't have water flow through the heater core, Coolant flows through the engine through the lower radiator hose as the water pump sucks it out of the radiator and pushes it through the engine. It then flows out the top radiator hose when the thermostat opens. It then flows into the radiator to cool off.