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It usually doesn't matter-it just circulates coolant through the core and returns it. But the hose going to the water pump is the return hose from the core. The other hose from the cylinder head or intake manifold is where the coolant comes from and going to the heater core. Take off the hose at the water pump and you will see a stream coming out with the engine running and the heater control on hot. Try this and if the stream is not good, try swapping the hoses at the core- I mean take the hose to water pump and fit it to the core's upper hose, and the inlet hose to the lower fitting. It shouldn't matter, but let us know.
are you installing the correct thermostat the right in the head or block
3 thermostats indicate incorrect fitment method
heater hoses run either way as the water is pushed through the heater core by the pump
Should not make any difference as long as the hoses are the same inside diameter. one hose is input and the other is output. Should not make any difference which way the water flows thru the heater core.
This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.
check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose
DON'T TRY. REPLACE ALL CABLES BECAUSE IT WILL CAUSE ALTERNATOR NOISE ON YOUR CAR AUDIO SYSTEM- IT WAS SPECIFICALLY DESIGNED TO THE ORIGINAL SET AND DOESN'T WORK FINE WITH OTHER.
DO NOT ASK MY HOW I kNOW THIS
I own a 200 Chevrolet Blazer and I have it for over 4 years mine does
the same thing I actually just noticed my heat getting less. My husband
found the best way to fix it and the cheapest way to fix it. He takes
the tube off the heater and attaches a water hose to it and flushes out
the gunk whatever is blocking the hose and after he does that the heat
works great. No cost and if I wanted to I could do it because its so
easy. My husband did some searching on the internet and a person that
this happens all the time to let me husband know. If you need more info
let me know I can ask my husband he isn't home at the moment I so I
don't have exact details. Thanks Amy
There are known problems with this vehicle's heater core not getting enough coolant flowing through it to blow hot air.
1) Even if the coolant looks good, there are problems with the heater
core plugging up. One solution is to use a heavy duty cleaner (CLR pipe
cleaner) to back flush the heater core. To know if the heater core is
plugged up, disconnect the 2 heater hoses at the heater core and
somehow connect a hose to one end of the core. Try to flow water
through, it doesn't have to be high pressure, and there should be a
steady stream. If not, try to get the cleaner directly into the heater
core and let it soak. Then back flush it and a lot of scale should be
seen coming out.
2) The other problem is that since the heater core is the highest point
in the cooling system air tends to get trapped in it. This should only
happen if the coolant goes low or someone has opened the system to
service it. There are a number of ways to bleed the system (vacuum
bleed, pressure bleed). One of the hoses should have a small hole in it
for bleeding air, pull that hose back just enough so the hole allows
coolant to flow out of it. Then accelerate the engine and get a good
flow coming out, when no more air bubbles are present, there should be
3)I've heard of bad water pumps with low flow causing issues as well as
an aux. water pump not fuctioning correctly leading to poor heat output
from the heater core. Someone should confirm this as I cannot get much
information on the aux water pump(electronic pump by the alternator
that is supposed to run after the car is shut off).