Question about 2001 Chevrolet Blazer

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No heat,I keep adding coolant and it dissapears.I think I mixed the green stuff with dexcool now its a paste.I am going to flush the heater core and the radiator.Will this solve the problem?

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You are off to a good start use prestone 10 min flush and if it was me i would put the green ant-freeze back in only because the red has so kind of cleaner or something in it and i have had problem with it myself and i alway flush it out and replace it with green ant-freeze

Posted on Feb 25, 2009

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Little heat when car is heated


when vehicles get this old and maybe there fluids havent been kept perfect over the years then yes due to sedaments in the cooliing fluid the heat core tends not to get as hot as it did when new , you can try a coolant flush , run heater while proforming a "hot" flush but do use all the normal precausions when dealing with hot engines

Feb 20, 2015 | 1994 GMC Sonoma

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What if one of the hoses thats hooked to your heater core is hot and the other is cold what does that mean


YOUR HEATER CORE IS STOPPED UP. YOU CAN TRY HAVING THE COOLING SYSTEM POWER FLUSHED. BUT I HAVE HAD LIMITED SUCCESS WITH THIS.THESE TRUCKS HAVE A PROBLEM WITH THE SYSTEMS CLOGGING. AFTER YOU HAVE IT FLUSHED DO NOT REFILL WITH DEXCOOL. THAT WAS ONE OF GM GREAT IDEARS THAT IS NOT GOOD THE STUFF IS CORRISER. REFILL WITH REGULER GOOD OLE GREEN ANTI FREEZE WITH A50/50 MIX HOPE THIS HELPS BILL

Dec 11, 2012 | 1996 GMC Yukon

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2005 equinox blows cool air until engine has been running. then much later when heat is on heat begins to feel a [tad] lukewarm after then. what type or brand of coolant should be used in this vehicle/...


It sounds like your thermostat is going bad. However if you start noticing any liquid in your floorboard the heater core is on it's last leg. Check your manufacturer's specs before adding any anti-freeze. More than likely your Chevy requires only the use of DexCool antifreeze. It is very important to be sure that you do not ever mix brands of antifreeze if they require DexCool. Mixing any other coolant with DexCool will cause a chemical reaction causing the liquid to turn to gel. You can end up with internal corrosion of vital engine parts, engine lock up, and serious overheating as a result. As a general rule for engine safety and performance you should always check to make sure that you are adding the same color of coolant to what is already in the car. If it's green don't add orange. Before changing colors (types) of antifreeze in your vehicle, you will need to flush out your engine till it all runs out.

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I flushed my antifreeze in my 2002 Ford Explorer and filled with regular antifreeze. It was still low so I added DEXCOOL antifreeze that I have for my Chevy...Since then, my windows are either not...


sometimes when you flush the system especially if you use a flush chemical and have a weak seam on the radiator, heater core, water pump, etc. any part of the cooling system it will cause a leak I have had it happen to me before, it sounds like the heater core is leaking which unfortunately is expensive to replace

Jan 21, 2011 | 2002 Ford Explorer

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1999 olds silhouette heat is warm when running but the gets cooler when idling also heater hoses have no pressure on them. I have checked coolant level added some. Checked for air in cooling system by...


The heater core could be clogged. If your antifreeze is orange , then it is Dexcool antifreeze which causes slime and sludge to build up in the cooling system. It can clog a heater core. My suggestion would be to drain and flush the entire cooling system with Prestone Super Flush. Put in a new thermostat while your at it. Refill the cooling system with a green antifreeze that is labeled compatible with aluminum engine parts and radiators.Do Not refill with Dexcool antifreeze.

Dec 23, 2010 | 1999 Oldsmobile Silhouette

1 Answer

Coolant level ok no leaks new 195 deg. thermostat still very little heat from heater defective heater core?


I am assuming your vehicle has the pink antifreeze called Dexcool. This is the recommended coolant for all late model GM cars and trucks. This coolant tends to form a pasty sludge in the cooling system which can lead to overheating and/or plugged up heater core. Try flushing the cooling system with a good aftermarket product such as prestone radiator flush. First thing to do is drain all the pink coolant, then add the radiator flush and fill with plain water. Run the engine according to directions on the flush container. Drain the radiator again and refill with plain water. Run the engine for a few minutes and drain again. Keep repeating this until all the pink antifreeze has been eliminated. Fill the system with 2 gallons of green antifreeze. Make sure the antifreeze container says it is compatible with aluminum engine parts. Hope this helps. If it does, then you won't have to replace the heater core.

Dec 16, 2010 | 1999 GMC Sonoma

1 Answer

Heater works sometimes. Blows warm then blows cold. could it be in the panel


Not likely. Check to see if you have coolant in the radiator and resevoir. If so...these cars have a notorious problem with plugged heater cores. The heater core allows coolant from your engine to cycle through what seems like a small radiator inside of your vehicle. Heat dissipates off of this/ or is blown off of it by your blower motor to give you heat. If you look at the two hoses that are located under your hood going into the firewall (or inside of the vehicle) put your hand on them when the car is warmed up. If one is cool....you more than likely have a restriction in your heater core. This is typically caused by oil mixing into the cooling system due to bad intake or head gasket....or, due to mixing coolants....like mixing the green stuff with the orange stuff (dexcool). Basically, you can blow out the core by removing the hoses, and applying compressed air through the system very slowely...not too much...cores are very delicated with very small orifices. Some people hook a hose up and let it work. If this works...hook hoses up and enjoy your heat. If it doesn't they sell chemical cleaners at part stores that will have to be poured into the core and let sit there for a few minutes....then hose it out. If one doesn't work...try the other. I obviously don't have the vehicle in front of me, but it is possible that you may have a bad thermostat too. But that usually will cause other issues....like erratic temperature guage on the dash

Nov 14, 2010 | 2001 Chevrolet Blazer

1 Answer

Running hot with no heat coming out of interior vents it has coollant what to do next i have already put on a new thermostatand yes the fan is working


if running dexcool coolant...may be clogged...dexcool muds up after a while and will clog heatercore and possibly radiator...run some flush product through and replace coolant...not always possible to completely flush out heater core without pulling heater core lines loose and flushing them directly

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3 Answers

Dexcool vs Green coolant


Dexcool is an extended life coolant-you cannot mix the 2 or you you will have serious issues. If you are going to switch over the the dexcool from the green you need to flush the entire cooling system.

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1 Answer

No heat 97 deville-


Hello;
Have your heater core backflushed. These vehicles use DexCool and they clog up terribly. The DexCool antifreeze does not mix with anything so you will need to flush the system. Hope this helps.
Thanks;
Rich
RPM Northwest

Jan 27, 2009 | 1997 Cadillac DeVille

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