Question about 2000 Chevrolet Blazer

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Will a flush and fill of my radiator help with the fact that my heater isn't working. it is not the thermostat and about 2 years ago i had the same issue and the repair guy said there was a bunch of stop leak that was inside and that another flush might be needed. thanks...

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I have had a 4 cylinder s-10 and a v6 sonoma Both at about 100 thousand the heat stopped working. It's the heater core in the dash never put stop leak in any thing it's a sure fire way to clog up your whole system in my experience. A patch is never as good as a replacement. I know it;s a long job but do it right so you don't have to be sorry later. Another work around that i did for a while i went to wal-mart and bought a 9 volt heater that you can put on your dash to defrost your window considering a heater core will take 2 days to remove and replace !

Posted on Oct 18, 2010

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HOW TO FLUSH AND RENEW COOLANT?


if the thermostat is in the head at the top radiator hose , remove it an fill the cooling system until the water is at that point --refit the thermostat and continue filling
make sure that the heater is turned on so that any air is moved out of the system

May 30, 2016 | Cars & Trucks

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How to Flush the Cooling System.


Normally the engine operates at 195F, unless you have replaced the thermostat with another one at 185F. If the temperature has a tendency to rise up, the reason is a partially obstructed cooling system or/and a bad thermostat.The first part of the cooling system that gives up is the heater core, because the coolant flowing channels are thin. It is the time for a coolant flush in your car. To do it right then you need time. Plan ahead for a weekend. With a cooled engine, start with the heater core hoses. Disconnect both of them, but the dirt has to go out of your car, so with a garden hose back flush it and let the dirt to get out of your cooling system. After you will get clean discharge,it is the time for coolant bottle, remove it, discharge the used coolant and clean it. The third to come is the radiator. Open the drain cook, or disconnect the lower radiator hose, and disposal used coolant properly. Now open the radiator cap and flush with water the radiator till discharge will be clear.You think that you are done? Not yet. There is half of old dirty coolant trapped in the system. Install everything, and connect all coolant system hoses, radiator, heater core and coolant bottle. Now you have to run your car with water. Fill out the cooling system with distilled water, start engine, turn on the heater high, and run till upper radiator hose get hot. That means the thermostat opens. Let the engine to cool down, open the radiator cap, and draining cook or lover radiator hose and drain everything. You can use flush detergent, if you wanted, at this stage, but flushing with detergent will add 4 more hours, because the detergent is colorless and you have to guess how many fill and drain processes to do, to get rid of it. I do not do it, but if your cooling system is very dirty you have to do it. After the last drain, fill the cooling system with concentrated antifreeze and 30% distilled water. The reason is because it is more water trapped inside the cooling system. The goal is to reach 50/50concentration. You need a coolant tester to find this. Start the engine and add coolant till radiator is full. Install the radiator cap and bleed the system. After driving you car for a day or so, let engine to cool down, open the radiator cap check the concentration of coolant with the tester, and add antifreeze or distilled water as necessary. It is a good idea to replace the thermostat while flushing the radiator. This procedure has to be done every 2 to 3 years. It is up to you to decide to use RED GM Dex-Cool or GREEN Prestone antifreeze. In all my cars I have replaced Dex-Cool with Prestone, but I flush the system every 2 years, and I never had a cooling system problem in all my cars.

on Nov 14, 2010 | Chevrolet Avalanche Cars & Trucks

2 Answers

Heater dont blow hot air even after it gets warm


mine was same way for a year... tried several things but finally we disconnected hoses under hood and flushed out heater and now works good as new...... hope it helps

Nov 03, 2011 | 1992 Dodge Dakota

1 Answer

Flush radiator


The radiator can best be flushed by removing it and taking it to a radiator shop.
They will power backflush it with a large volume to remove trapped debris.
Before taking it tio the shop, if it were mine, I'd flush the entire cooling system first.
The block should have drain plugs on one or both sides to aid in doing this.
If your heater is doing a fine job,it means it isn't plugged at all and so exclude it from this flush by
by taking loose the heater hose from the thermostat area and reconnect the heater hose directly to the water pump inlet heater hose.
Do your flushing according to directions and do a final rinseout before disconnecting your radiator and removing it to take to the shop. don-ohio

Oct 18, 2011 | 1995 Ford F250

2 Answers

I have a 2001 dodge dakota v6. It was heating up so I flushed the cooling system and changed the thermostat but now the heater isn't working and it still heats up when I use the air at low speed. Help!


You have an airpocket in the coolant system. This is very common after repairs and could be difficult to remove. Try filling the radiator while squeezing the upper and/or lower hoses. This will help purge air from the system. I like to force feed the radiator. Start the engine cold, remove rad. cap, have someone increase rpms to about 2k and hold steady while you fill radiator and replace cap. This may take a few tries but will eventually work. Keep at it and please rate me.

Sep 01, 2011 | 2001 Dodge Dakota

2 Answers

I want to learn how to drain and flush my radiator. I need help on how to do so without making as mess


well its bound to make a little mess but you should have a drain plug on the radiator at the bottom towards the engine side on one of the 2 tanks (sides of radiator ) unscrew drain plug and let drain into a pail or pan ( 2 gallon ) after it drains remove lower radiator hose. use a garden hose and fill radiator and let it flush for a little, hook lower radiator hose back, tighten drain plug and fill with a 50/50 mix new antifreeze,

Feb 07, 2011 | 1996 Ford Taurus

2 Answers

I own a Buick 1999 Century and have been having many problems recently. The temperature gauge keeps reading that it is overheated; while the last two weeks it was not overheated, it did need obsessive...


You might try replacing your radiator cap or if you system is pressurized, you may have to replace the degas bag (fill container). Another problem could be a bad thermostat or an improperly installed thermostat. I forgot to mention, does your engine fan operate? If not, that would also cause your car to overheat.

Jan 06, 2011 | 1999 Buick Century

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

3 Answers

04 Chev. Avalanche 1500 Z71 5.3 125K mi. Temp gauge reads erratic from 210 to 245 or so. heat blows warm then cold. Coolant level, OK. I have been told could be sticky thermostat but usually is restricted...


Normally the engine operates at 195F, if you did not replaced thermostat with another one at 185F. If the temperature has a tendency to rise up, the reason is a partially obstructed cooling system or/and a bad thermostat.
The first part of the cooling system that gives up is the heater core, because the coolant flowing channels are thin. You got a good advice but not the best one. It is the time for a coolant flush in your car. To do do it right then you need time. Plan ahead for a week end. With a cooled engine, start as your friend advised you with the heater core hoses. Disconnect both of them, but the dirt has to go out of your car, so with a garden hose back flush it and let the dirt to get out of your cooling system. After you will get clean discharge, it is the time for coolant bottle, remove it, discharge the used coolant and clean it. The third to come is the radiator. Open the drain cook, or disconnect the lower radiator hose, and disposal used coolant properly. Now open the radiator cap and flush with water the radiator till discharge will be clear. You think that you are done? Not yet. There is half of old dirty coolant trapped in the system.
Install everything, and connect all coolant system hoses, radiator, heater core and coolant bottle. Now you have to run your car with water. Fill out the cooling system with distilled water, start engine, turn on the heater high, and run till upper radiator hose get hot. That means the thermostat opens.
Let the engine to cool down, open the radiator cap, and draining cook or lover radiator hose and drain everything. You can use flush detergent if you wanted at this stage, but flushing with detergent will add 4 more hours, because detergent is colorless and you have to guess how many fill and drain processes do do to get rid of it. I do not do it, but if your cooling system is very dirty you have to do it. After the last drain, fill the cooling system with concentrated antifreeze and 30% distilled water. The reason is because it is more water trapped inside the cooling system. The goal is to reach 50/50 concentration. You need a coolant tester to find this. Start the engine and add coolant til radiator is full. Install the radiator cap and bleed the system. After driving you car for a day or so, let engine to cool down, open the radiator cap check the concentration of coolant with the tester and add antifreeze or distilled water as necessary. It is a good idea to replace the thermostat while flushing the radiator. This procedure has to be done every 2 to 3 years. It is up to you to decide to use RED GM Dex-Cool or GREEN Prestone antifreeze.
In all my cars I have replaced Dex-Cool with Prestone, but I flush the system every 2 years, and I never had a cooling system problem in all my cars.

Nov 14, 2010 | 2004 Chevrolet Avalanche

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

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