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How to flush hoses for clog for heater to operate

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  • Cars & Trucks Master
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Remove the heater hoses from the engine and using a water hose, flush it out both ways, several times. This doesn't help much though. Most times, replace the heater core.

Posted on Dec 28, 2016


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: I have a 1998 Buick

If one hose is hot and the other is cold it is because the coolant is not circulating through the heater core. There is nothing else that can cause this. (no valves in the system, etc.)

Make sure that the heater core outlet hose (the one that is cold) is not kinked or pinched to prevent proper flow. If this is OK then replace the heater core. I have seen heater cores that look like they are passing water well enough when flushed with a hose but were too resricted to pass the low-pressure water from the water pump.

Posted on Dec 05, 2010

  • 66 Answers

SOURCE: 2004 blazer 4.3L heater blows cool air, i flushed

If the heater core has gone out you'll know it because it'll be leaking inside and you can smell it. Check the heater hoses and make sure they are both warm (which means the hot water is circulating). If not, I'd think the heater control valve is stuck. If it is, then I'd check to make sure the vent doors are working correctly. They are usually vacuum actuated. Are all the vents blowing according to the setting on the a/c control panel?

Posted on Dec 08, 2010

  • 2299 Answers

SOURCE: I have a 4cyl 1998

There is a heater control valve on the heater core hose. This is a common problem on the Jeep Wranglers. The valve is not opening.

Posted on Jan 10, 2011

  • 814 Answers

SOURCE: 97 jeep gc only one heater hose is hot ? i get no heat

Yes. Is there a heat valve in the heater hose may not be opening. Next no heat valve disconnect both heater hoses crank engine and see where the water squirts out of engine thats where the inlet side of the heater Hook the garden hose to the other side and blow it out probably full of rust change antifreeze more often

Posted on Dec 25, 2011

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SOURCE: Where are the heater core hoses located to disconnect for a flush?

Regarding this types of problem,i suggest you to go through this help links.Click the link below to go through the procedure and troubleshoot the problem :----HOW TO REPLACE AN UPPER RADIATOR HOSE

----------How to Flush Heater Core?

For heater core replacing procedure. I suggest you to go through this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?

Click the link below: ---

How to Flush Heater Core?

How to Remove Heater Core ?
Heater Core Replacement?

To replace heater core?

How to replace heater core?
How to replace heater core on Buick Regal?
----------This will help.Thanks.

Posted on Feb 18, 2012

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3 Answers

My heater stoped working the a\c still works and fuses are fine

Either the heater core is clogged or busted, or a blend door is broken.
YOU TUBE has a lot of videos on this subject.

Jan 28, 2016 | 1998 Ford Expedition

1 Answer

Is there a relay for the heat,sometimes there is heat sometimes not. one heater hose hot one warm. or is the heater coil clogged

Probably the heater core. I backflushed my Dodge Dakota and that fixed the problem. Determine which hose is the supply and the rerurn hose. Take them both loose and back flush with your outside hose pipe. Do NOT turn the hose on full blast you could damage the heater core. I opened my hose bibe 1 turn open after fitting a connection to the heater hose. I back flushed, then forward flushed and back flushed a 2nd time. I saw it done on You Tube. Fixed my Dodge! Blows HOT air now!!

Jan 28, 2015 | 2003 Chevrolet Silverado 2500HD

1 Answer

Flush clogged heater core

A quick check of the heater core is to feel both heater hoses after the engine has fully warmed up. If both heater lines are hot, the coolant is circulating. If one feels cooler than the other, flushing it backwards with a low volume garden hose might help, unless there is a water valve in one of the lines that is closed-only some have a valve, not all cars. Pull the hoses off and try it. Some have even used an air compressor blow gun. If a lot of crud comes out, you may have fixed it.
Sometimes, the older cars get, the rubber seals on the heater case deteriorate, so cool air can sneak in and the heater just doesn't work as well. Big job to fix that. Try flushing the core if you think it needs it, and check heater case doors operation-maybe the temperature blend door is not opening fully.

Dec 26, 2013 | Saturn S-Series Cars & Trucks

1 Answer

Hot heat at idle cool when driving

is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

Dec 13, 2013 | 2004 Pontiac Grand Prix

1 Answer

Im not getting any heat when im driving

It is most likely a collapsed heater hose or clogged heater core. If you aren't mechanically inclined, take it to a reputable mechanic and have the cooling system flushed and the heater core back flushed and all the hoses checked for separation.
It could also be a thermostat stuck in the open position. Thus, the engine is never given the chance to get to operating temperature. If this is the case, the temperature gauge will stay on or near the "C".
I hope this helps. Good luck.

Nov 05, 2013 | 1997 Volkswagen Jetta

1 Answer

97 jeep gc only one heater hose is hot ? i get no heat

Yes. Is there a heat valve in the heater hose may not be opening. Next no heat valve disconnect both heater hoses crank engine and see where the water squirts out of engine thats where the inlet side of the heater Hook the garden hose to the other side and blow it out probably full of rust change antifreeze more often

Dec 05, 2011 | 1997 Jeep Grand Cherokee

2 Answers

My heater core is clogged, is there any way to unclog it instead of replacement?

No easy way. You can try backflushing the heater. Might try disconnecting both heater hoses and useing a garden hose to attempt to flush water backward throught the core.

Dec 24, 2010 | 1999 Ford Taurus

1 Answer

2001 rx300 no heat from heater

If your vehicle is not leaking or overheating(coolant level is fine) and there is no smell or fluid in the floor board, then the heater core is not leaking(most likely) but it still maybe clogged. Find the heater core lines, they run from tthe engine into the firewall, with the vehicle running and at operating temperature feel of both hoses, they should be warm to hot, if one is and the other isn't then you have a clogged heater core. If this is the case turn off the vehicle and let it cool down then pull the two hoses check to make sure there is no blockage in the hoses then use a hose and flush it through the heater core and see if anything comes out, this should clear out the heater core. If water will not come out of the other side of the heater core it is definitely clogged try flushing through the other way, if water still wont pass through you may need to pull the heater core from behind the dash and try to clean it or replace it. This is where I would begin.

Sep 24, 2010 | 2001 Lexus RX 300

1 Answer

Heater core is clogged, not hot heat coming out.

you can try to flush it out by removing both heater hose going into the core and coming from the core. Hook a garden hose to the hose going in and then try flushing the hose going out. Normally once a heater core is clogged there is only the option of replacing it.

Oct 06, 2009 | 2003 Chevrolet S-10

1 Answer

Heater not heating, but it blows

Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

Mar 05, 2009 | 2003 Chevrolet Impala

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