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Old 01-21-2012, 07:19 AM
96derek 96derek is offline
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Default Heater core gurgling?? Help

Hi, I'm new to this forum and new to working on vehicles. I inherited a 96 ranger, 2.3L from my grandfather and I've slowly nursed it back to health. The latest issue is a gurgling sound coming from heater core when I turn the heat on. It blows hot air just fine and doesn't over heat or anything. I've flushed the radiator and done numerous other tune up related things. This just has me wondering what it could be and how serious? This forum has helped me many times so I ask for any help I can get! Everything seems fine other than the noise when I turn the heater on or off. Thanks for your time!!
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Old 01-21-2012, 07:25 AM
FireRanger FireRanger is offline
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Default Re: Heater core gurgling?? Help

The cooling system is just not refilled all the way.

On a COLD engine, fill the radiator up all the way and fill the reserve tank 1/2 way. Unless you have the tank integrated into the top of the radiator, in which case, just use the full line. Leave the cap off. Start the engine and turn on the heat. Let the engine warm up. Once it reaches operating temperature, the thermostat will open and allow coolant to flow through the radiator. The level will probably drop. Keep refilling it to keep it topped off until it no longer drops. It may even begin to rise. Pop the cap back on. Done.
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Old 01-21-2012, 10:08 AM
macx macx is offline
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Default Re: Heater core gurgling?? Help

When I put in a new thermostat and radiator in a recently purchased 2.3 Ranger cuz the system was so neglected and crudded up from the previous owner, I tried to flush the heater core without removing it by holding one hose up high and pouring hot water into it and running the other hose down into a bucket. LOTS of crud!

Anyway, recently installed a numbered temp gauge with the sender in the heater hose coming out of the T-stat housing, right next to it. So drained the system of course. Now not getting as much heat out of the core, have realized I need to again take one of the hoses loose and hold it up high and pour water into it to purge the air out of the top of the heater core. The inlet and outlet on the core are both at the top, so can imagine it could get air locked pretty easily esp since the top of the core sits higher than the ends of both heater hoses where they hook to the engine.

After you do that, hold your thumb over the hose and hook it up quickly to avoid getting much air into the line when water runs out.

I'd think that purging the air like that might help your gurgling.
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Old 01-21-2012, 11:55 AM
96derek 96derek is offline
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I will give the letting it run and topping it off a try. Last time it was flushed I had a shop do it so I cant say if it this was done although it has been several months. This one had also sat for a few years and was pretty gunked up but I seem to have gotten that part straightened out. I hope its that easy to fix, I was worried about heater core replacement! Thanks for the info and I will post once I give it a try!
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