Question about 2000 Jeep Grand Cherokee

1 Answer

Clogged heater hoses


Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Jeep Master
  • 6,982 Answers

Generally heater hoses do not clog. Likely the problem is in the heater core (inside the dash). Best thing I've ever used to flush a system is the same stuff you use in an electric diswasher, to do the dishes!! Add it to the radiator when it's cold, run it for around 45 minutes at idle with the heat on high. Let it cool down and drain the system, re-fill with water and run for a minute, then drain again to get everything out of there. I've found the easiest drain method is to remove the lower hose at the radiator. (runs between the water pump and radiator). Re fill with a 50/50 antifreeze mix and you should be good to go. BUT, if your dash gauge reads below 210 degrees, when it's warmed up, you may have a thermostat that is stuck open or missing, in which case it needs to be looked at. (therm is in a housing at the engine end of the upper radiator hose. spring end goes in the engine when replacing)

Posted on Jan 11, 2013


1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

No heat and both the radiator and thermostat are new.

There are a couple of possibilities....

1. The heater core has been bypassed. If the core was leaking someone may have looped the heater hose back on itself. Check to ensure that the supply and return heater hoses are in place and properly routed to the firewall.

2. The heater core may be clogged. Age does a lot as does old coolant to clog up a heater core. To check the core disconnect the heater hoses at the block. Blow through one hose and see if you can get coolant/air to pass through the core. You can raise one hose higher than the other and pour water through or use low-pressure air as well. If the core is clogged, it may be possible to unclog it using a diluted drain cleaner. Pour the diluted cleaner into both hoses and let sit for a time, then flush with clear water. This may take several attempts. If it works it will save much time and expense. The unfortunate downside is that there is also the possibility of generating a core leak this way. But considering that if you hadn't tried you would have to replace the core anyway, you have nothing really to lose.

3. The blend door in the heater control box may be stuck and not letting air pass thru the core to heat the cabin. This one is hardder to verify.

Nov 14, 2013 | 2001 GMC Jimmy

2 Answers

How do you unclog heater core in a 2001chysler sebring

If the core is clogged because of particles and corrosion you may just want to replace it. You will have to unhook the two water hoses to the core and backflush the core and that shjould push the stuff back out the inlet hose. The two lines are the ones on the back of the engine firewall.

Dec 02, 2011 | 2001 Chrysler Sebring

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

2004 blazer 4.3L heater blows cool air, i flushed the radiator and back flushed the heater hoses 1 hose was clogged but got it unclogged, seems a little bit warmer but not like it should be, i've checked...

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?

Dec 08, 2010 | 2004 Chevrolet Blazer

1 Answer

Water leaking on passenger floor

Check, if it's coolant, going to be a leaking heater core, if it's water, a/c drain clog up, go under hood, passenger side fire wall, look for little hose coming out of fire wall, stick a pen in there to unclog.

Aug 16, 2010 | 2004 Jeep Grand Cherokee

2 Answers

There's no heat coming out of the vent, just cold air. What is the possible solution to this problem

possible low anti freeze, air bound heater core, defective heat blend door control servo. Start with coolant level, if o.k. check hoses feeding heater core. If the lines are both hot suspect blend door servo/control unit. If only one hose hot suspect clogged/air bound core. Special bleed procedure for engine. With engine running, check for bleeder scews at upper hose mounting, open bleeder and watch for steady stream of coolant. Be careful as coolant is hot. If this does not help, disconnect hoses frm heater core when cool and blow out core with compressed air to unclog system. I hope this helps.

Dec 25, 2009 | 2002 Acura 3.2TL

1 Answer

Heater/defrost doesnt blow hot heater hoses one

The heater core is probably clogged. The best method i have found is to remove the heater hoses, and blast compressed air into one side or the other in short bursts. This will tend to launch a clump of sludge out of the other side, and is very messy. Once the heater core is unclogged and reconnected, it is a good idea to chemically flush the entire cooling system, then flush with clean water and refill with universal coolant.

Nov 18, 2009 | 2000 Chevrolet Silverado 1500

Not finding what you are looking for?
2000 Jeep Grand Cherokee Logo

183 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

79847 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides