Question about 2002 Chevrolet Blazer

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Radiator/Heater Coil Issue on 2002 Chevrolet Blazer

I recently replaced my radiator in my 2002 Chevrolet Blazer. We have flushed several times since it has been replaced but the water is still dirty. We placed a clearer in the radiator which instructed us to run the car for 3 to 6 hours then flush out cleaner. When we ran the engine with cleaner in it we started to get funny odor coming from ac and it looks like there is smoke coming from ac vents in car. Someone said that the heater coil had a leak and the radiator corrosion caused that leak to become plugged and the cleaner we placed in radiator unclogged leak. Please advise. Do you think that this is the issue and if so how do i fix my heater coil leak?

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It is very possible that your heater CORE is bad. You will smell a sweet odor of antifreeze inside your vehicle if it is leaking, and possibly feel for a wet spot on the floor boards. Need to replace heater core.

Posted on Jun 26, 2009

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How to flush a heater core
When you flush your radiator, the heater core gets flushed as well. You will have to run the vehicle untill the heater is blowing hot air during the flush, that way its going through the thermostat. Empty the radiator as per normal and thats it.

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Just replaced radiator in 2003 blazer old radiator leaked all fluid out put new fluid in to get home do i need to flush and fill or just fill ok do i need to jack up above heater coil to fill and does the...
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1 Answer

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Flush coolant system out first with prestone or peak coolant flush if problem still exist replace heater core.

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I HAVE A 02 CHEVY BLAZER HEATER ONLY BLOWS COLD AIR NO HEAT.I have replaced waterpump,thermostat,had radiator rotted out and flushed heater core.I noticed neither of the heater hoses where getting hot.I...
See if there isn't something here that might help:

https://www.cargurus.com/Cars/Discussion-t2530_ds537275

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1 Answer

1995 TAHOE BLOWS HOT AIR OUT THE VENTS DURING ACCELERATION
Did you mean the only time it blows hot air is under acceleration?

First thing check the coolant level in the radiator. If coolant is low the first hing to stop working is the heat.

If the coolant level is fine but the coolant is muddy I woulds suspect a plugged heater core. You can try back flushing it by removing both heater hoses (engine cold) and then use a garden hose to flush clean water through the heater core. Do this on both pipes going into the heater core. Keep flushing until the water runs clear. Re attache the the hoses, remove the radiator cap, start the engine, let the engine come up to temp and top off the radiator with straight coolant (to comp for the water in the heater core). You may have to repeat this process several times over several days but you should be able to get it cleared enough to get sufficient heat without having to replace it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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1 Answer

Heater stopped working and my heating coil works fine
clean out the radiator hoses and make sure there's no stop leak in the radiator or hoses. also flush the heating coil out several times

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1 Answer

Bublling in the thermostat housing and very hot upper radiator hose
I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

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open the drain valve on the bottom inside of the radiator, run the engine with the garden hose in the radiator cap, have the heater switched on high temp.  After the water comes out clean, turn off engine and let all water drain out.  Replace with 50/50 mix if distilled water and antifreeze.  Collect old antifreeze as it is very toxic and poisonous. 

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Yes the issue is most likely an air block, jack the front of the truck up as far as you can, fill the recovery bottle and run the engine for about 10 min, then shut down and run cold water over the radiator, this should purge the air, recheck the recovery tank and refill as ness.

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