Question about 2010 Jeep Commander

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2010 Jeep Commander. Overheating, coolant in passenger floorboard. Replaced the heater core but overheated again and coolant in floorboard again. What else could the problem be? Runs fine when I bypass the heater core from engine side of firewall.

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  • Jeep Master
  • 635 Answers

Possibly bad heater hose going into or out of heater core.

Posted on Oct 14, 2013


6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: The heat in my 1992 Jeep Wangler is not working.

It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
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Posted on Feb 05, 2009

  • 68 Answers


did you check rad 4 leaks and make sure all aluminum mesh is intaced beetween cores i had a jeep do same thing or could possibly have air pocket let run with cap off while circulating through block check fluid level add if nessisary also they sell a very good product called water wetter its a synthetic helps fluid flow freer good luck

Posted on May 13, 2009

  • 1865 Answers

SOURCE: coolant not flowing to engine, overheating after replace radiator

Remove the thermostat and then try it. If it works then replace t-stat

Posted on Jun 12, 2009

  • 105 Answers

SOURCE: my 2000 jeep grand cherokee is overheating

replace your cooling fan motor relay because if you dont eventually your radiator will explode and this will cause your engine block to crack and then if your fan isn't blowing the engine will continue to overheat and the engine will seize and then you need a new engine. A cooling fan motor relay is around $30.

Posted on Jul 26, 2009

  • 432 Answers

SOURCE: 2006 4.7 Jeep Commander Overheating

Can you see the cooling fans come on? When the engine gets to 212 degrees the fans should come on. To test the fans, with the engine running turn the A/C on high, the fans should come on .
The system also has a 212 switch that screws into the intake manifold. This is what turns on the fans with no A/C.
I hope this helps you.

Posted on Sep 06, 2009

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1 Answer

My bakkie is overheating and losing water. Took it in for a service today. Mechanic claims they can't find water leak. What else could it be?

one item often overlooked in an overheating case is the radiator cap. it won't hold enough pressure to allow proper circulation of the coolant. it is the cheapest part of the cooling system. replace it and then look to the fans or fan clutch and the carpet area in the passenger footwell for leaking coolant in the floorboard from the heater core. test the cooling system with a pressure tester. is there trash or bugs blocking the fins of the radiator?? Is the coolant level proper and the right ratio 50/50 mix

May 11, 2015 | Cars & Trucks

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Bypassed heater core by connecting hoses together. Problem is heater blower turns on and instrument panel goes dead. Concerned, is there a relay or fuse I should disconnect?

there could still be water in the blower motor from the leak that shorts the power. you should remove the fuse for the heater until it has dried up ..or open it up and dry the inside yourself

Feb 08, 2015 | 1994 Chrysler Concorde

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Engine overheating.

That sounds like a plugged heater core or heater hoses. At lower RPM there is not as much pressure from the water pump, so the coolant can't circulate through the heater core. Find the heater hoses (in and out) on the firewall. With the car running, engine warm to hot, squeeze the hoses - they should be hot and pretty tight. If they aren't, then something's probably blocking them. Then you'd just have to figure out if if it's the heater core that's blocked or the hoses. You can disconnect the hoses and blow compressed air in to the heater core. Probably a lot of crud buildup. It's messy but it can be done.

Apr 05, 2014 | 2006 Jeep Commander

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Was the coolant old and weak? At ten degrees, a weak coolant could result in freezing and that can cause an engine freeze plug to burst open. Check the side of the engine block for signs of leakage around the freeze plugs. Another possibility is the heater hoses. They run along the passenger side of the engine as well. The last possibility is the heater core. If it leaks you may smell coolant inside the passenger compartment. You MAY get a wet floorboard on the passenger side. Coolant leaking from the core usually will fall into the condensation pan for the A/C and run out of the passenger compartment thru the firewall on the passengers side.

Jan 07, 2014 | 2003 Chevrolet Silverado 1500

2 Answers

2006 jeep commander passenger side condensation problem

Check your heater core/hoses behind a glove compartment.

Dec 26, 2012 | Jeep Commander Cars & Trucks

1 Answer

2001 Honda civic overheating, losing coolant, damp passenger floorboard

Damp passenger floor sounds like a heater core. What a pain in the a__. Most probably the dash has to come out to replace. That is the only thing I know of that circulates engine coolant into the passenger compartment.
If you confirm this and want to fix it on the cheap, you can put a crossover hose in the engine compartment and bypass the heater core entirely. This is a $5 fix that works perfectly, mechanically speaking. Unfortunately, you will have no heat. Of course, you may decide that is a better option once you hear a quote on getting the heater core replaced.
Oh yeah, get a new mechanic.

Nov 12, 2012 | 2001 Honda Civic

1 Answer

What causes liquid to drain onto floor of cab

Sounds like ur heater core is leaking. On most cars its located up under where your feet are on the floor. If you are overheating it is because you are loosing coolant, which would explain why your floorboards are wet. It is a huge pain to get to the heater core and usually entails ripping apart the dash to get to it. I would take it to a professional unless its an old truck and you can actually see the heater core.

Sep 13, 2012 | 1988 Ford Ranger

3 Answers

I have an 1999 chrysler 300m an it has an overheating problem. There is also water all over the driver side floor (front n back) it is soaked. It takes about 25mins b4 it starts smoking. Can som1 plz help...

Typically if your leaking coolant inside the car, it indicates your heater core is split and leaking. Replacing the heater core is quite the job. It requires removal of the dash board and heater box. i replaced one in a 97 Cirrus at work last week and it was a 6 hour job. If your not mechanically inclined i would definitley recomend phoneing around for quotes to local auto repair shops and getting it done profesionally.

Mar 15, 2011 | 1999 Chrysler 300M

1 Answer

The blower stopped blowing heat in my 2006 Jeep commander. i can feel warmth on th vent, the blower makes noise but nothing is coming out

You need to replace the blower motor. These are usually located under the hood on the rear fire wall, commonly on the passenger side. This is a fairly new Jeep, so it may be under the dash itself inside. Go to an auto parts store to make the purchase (or wrecking yard for cheaper one) and inquire as to it's whereabouts.
Please let me know if you need further assistance. Also, make sure that you do not have any leaks (just to be safe) and that your Jeep is not overheating. Common causes of overheating are the thermostat, hole in a hose, or a plugged heater core.
Please let me know if you need further assistance.
Guru, Premium Expert @

Jan 20, 2011 | Jeep Commander Cars & Trucks

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