Question about 2002 Chevrolet Blazer

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Cooling system performed cooling system flush. now there is a gurgling sound near my heater core. any idea what that may be?

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You still have air trapped in your cooling system, turn the heat to full and remove the radiator cap with engine running, Make sure you remove the radiator cap before you start the engine, once the engine has reached it's operating temperature and there is heat coming from the vents. Top off radiator till full and place the radiator cap back on with engine still running only on the first click, make sure the coolant over flow tank is at proper level and go for a test drive with the heat still on hottest setting. (roll the windows down).
Ofter test drive 5 min to 10min, with engine still running close off the radiator cap to the second click. Tank note that the cap may be to hot so use a rag and caution not to burn your self.
This should get any air in the cooling system out, any air in the system may cause the system to burst since the air will try to escape any week spot. That's why we only close the radiator cap to the first click to prevent any additional pressure that can cause a leak from the hot air.
Thank you for using fixya and be safe.

Posted on May 13, 2010


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How to flush heater core

Simple. You find the heater hoses feeding the heater core. Typically they are a smaller diameter then radiator hoses and they both run to the firewall. You will need to determine which one feeds the heater core ...the input hose. Once you know that ...check a Taurus owners forum or Google it ...then run your water through the heater core from the output side. The idea is to back flush the core in the hopes you knock loose the crud with high pressure water flow.

This heater core flush is usually done in conjunction with flushing the entire cooling system. Do the cooling system flush first then the heater core. When you do the system flush, use some flush agent ...Prestone makes it. If the directions say use one bottle, use two. The stuff is generally not all that potent and designed not to contaminate the ground water. Which means it's fairly lame stuff. Use two bottles.

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Gurgling sound in the cab

Well yes and no. The gurgling sound is air in the cooling system moving thru the heater core. The cooling system is not full of liquid coolant.
As for the cause of the coolant loss, if you fix the external leak and you continue to loose coolant, the head gasket could also be leaking.

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Sometimes a VERY slight hiss is audible after using the ac. But a gurgling is not normal and usually a sign that there is air in the cooling system. The noise is the air "gurgling" through the heater core. I'd almost bet money that's the problem.

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96 Century won't circulate heat without raising rpms then stops again at idle. Internal gage show overheating before raising the rpms then after drops to normal or below afterward. V6 with the intake...

I will start with the basics here first, i.e. Your cooling system needs to be properly filled.
A low coolant level will give you peaks and valleys in temp readings because the sending unit is not in constant contact with the coolant; it is just splashing on it (like dipping your finger in and out of a cup of hot coffee). For best results the sending unit needs to be in constant/direct contact with the coolant to measure its temp.
To fill your system:
Start with a cool engine and have everything you may need ready i.e. funnel, coolant, helper to rev engine.
Try revving the engine up to 2000 RPM's while topping off the radiator, then put radiator cap on while still revving engine. Return to idle.
Make sure your overflow tank is not too low either.

If that is not your problem then let's look deeper.

What color is your anti freeze? Factory "orange" is not good in my opinion.
Orange coolant can gel-up and clog your heater core.
You may need to purchase a "cooling system flushing kit" or pay to have it flushed out.

Do not reuse orange coolant. Revamp it with either the old green stuff or ask your parts man what's best.

This happened to my 1996 s10 blazer; turned out to be a restricted heater core.
My heater made a gurgling sound at certain rpm's, and did not heat well at all.

I flushed it out (the whole cooling system) following the instructions on a acid based flush kit and refilled it with the green coolant.
After the flush the gurgling sound was gone and I could not believe how much it improved the whole system; especially how hot the heater blew.

My blazer came with the orange coolant from the factory.
I was told if your level gets low with orange, it will thicken up.

I would also check for any kinks in your heater hoses just as another possibility.

Good luck!

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Chevy truck 96 cheyenne- I hear what sounds like water gushing when I press on the accelerator. The sound is located behind the center of the dashboard. Any ideas on what it could be?

I think you have air in your cooling system.It will gurgle and sound like sloshing when you step on the gas.check the coolant jug,make sure you have enough Anti-freeze.If the jug is overfilled it can make a sloshing sound also.If you very low,look at the front of the intake where it meets the heads.I've done a few sets of intake gaskets on this engine. Good luck

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I have an air lock in my 1998 ford taurus se radiator .it seems like after a couple of minutes having warm air it begins to get cool again

Sounds more like a clogged heater core than an "air lock".

Flush the cooling system - twice!! with a decent cooling system cleaner - and be sure that the heater is on full heat when doing it.

I bet that you see a great improvement in performance!!

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I have a 97 tahoe and it is no longer blowing hot air. A/c works and it blows air but it wont get hot. Before the heater went out it use to make a gurgling sound from heater core.

Hello Daisy.
The gurgling sound may have been air mixed in with the coolant/Antifreeze.
Have you checked the level of your coolant?
Don't trust the reservoir level. Open the radiator cap itself when the vehicle is cold and check the level there.
If the level is low, top it up and try it. If it is low then it would be a good idea to check the cooling system for leaks.
Hope it all goes well for you.

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No heat thermostat isopening and closing andfanis working sometimes you get a little barley warm air then it goes back to cold air also ck. eng. light is on

Ck Eng light probably not related.
The heater core is clogged. A bottle of cooling system "quick flush" may be all you need ($6 AutoZone).
There is also a complete flush system, but requires that you splice into the heater hose (I installed it on my Taurus - works great!).

By the way, there is a heater core bypass hose. It is connected to the two heater core hoses near the firewall. You may want to remove the two "Tee" fittings and use a 5/8" hose splicer so that the flush passes through the heater core at full force. Put the Tee's back in place after the flush.

If you remove the tee fittings and don't flush, the heater will work, but the core may eventually start leaking.

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