Heater not working
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Thread: Heater not working

  1. #1
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    Heater not working

    Hello,
    I have a 2002 odyssey ex w/~50,000 miles. Can not get the heat to come on even after driving 10miles. It just gets luke warm. This heater in the past got really toasty. Weather conditions in Northeast have been vey cold, <20 F. This seems to happen only when it get really cold, other times it is OK. It is a safety concern for my family because we will not be able to melt the snow off of our windshield. Any ideas?

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  3. #2
    Registered User hockeyman's Avatar
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    My guess is that the Thermostat is probably getting stuck in the "open" position, which is not allowing the coolant to get hot. It's basically running the coolant through the radiator at a steady rate, as where it should stop it periodically, and allow it to heat up.

    If you have a regular mechanic, take it to him/her and ask them to change it. It shouldn't cost anymore than $50-$80...at the most! If you know how to do it yourself, then your battle is half over with.

  4. #3
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    I am going throught this problem with my Altima..I went in for a simple Antifreeze change and decided to do the thermostat as well to be safe.....Next week will be my 3rd visist back to the dealer with no heat when I stop.....Same service dept as my Honda....

    Really unbleievable....
    King of Custom Pedals
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  5. #4
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    Strange, I was out and about with the kids today and the heater worked, and yes it did get toasty. I drove to the park < 5miles and back, no problems. Might I say, it was only 31 degrees F. This seems to be a problem only when it gets really cold. Might there be something sticking. I don't want to go to the dealer if I don't have too, since they will tell me that it is working. I know it is intermittent. Any easy explanation for this, maybe a link to a how to do it would be nice.

  6. #5
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    It's not intermittent. The only thing (if you think about it) that is intermittent is the outside air temp. The colder it gets outside the less "toasty" the inside of your Ody feels. Change the thermostat.
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  7. #6
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    The climate control system in an Ody is much too complex for the pat answers you are getting. We have had many more reports of sticking heater valves than engine coolant thermostats. In the EX, turning the temp all the way to either extreme overrides the "auto" function. Turning it all the way up heatwise should give maximum heat. Do also run the rear heat and see how warm that blows. If you get really warm air out of the back but not the front, that will tell you if hot coolant is available.

  8. #7
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    I have climate control in my Altima..And it blows hot sometimes/most times..But when I stop and that air pocket gets stuck in that special spot...I get luke warm air (Not every time)
    King of Custom Pedals
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  9. #8
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    OK still problems with my ody, no heat. front or back. My mechanic wants to replace the thermostat but from what I reading that is not the problem. Any ideas.

  10. #9
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    You need to locate the heater control valve (it's next to the firewall) and confirm that it is moving when you adjust the heat. As I said before, we have had reports of those sticking. Also do the experiment with the rear heat. Report back. There is a completely separate coolant line running to the rear. Remember, rear heat comes out by the floor back by the passenger sliding door. (never from the roof, heat from under the front seats are on the front system) If you have heat in the rear, then the problem is with the front system and not the engine thermostat. The corner mechanic is not the one to fix an automatic climate control system. As a matter of fact, the non Honda savvy maybe should not touch your van at all. See this thread:

    Heater does not get hot = cooling system clogged

  11. #10
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    The guy I use only works on Hondas. He is a honda repair shop. He flushes all liquids every 30,000 miles. Never had an issue with him before. Though I am not sure he knows what is going on with my heating issues. I found no heat from the front or the back. Not sure where the firewall or what the valve looks like. Can you send me some pics and some step by step directions. I don't want to replace the themostat or anything else extraneously. Thank you for your help.

  12. #11
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    Perhaps you should point out to your Honda specialist that Hondas have been coming from the factory with special long life coolant that lasts to 120,000 miles for years now. In the thread I linked above, that poster found his cooling system corroded from a mechanic using the wrong coolant. I personally stopped using my long trusted independent Honda specialist when he dumped the long life coolant out of my wife's Ody at 30k. And charged me for it....

    Did you read the thread I linked? In that thread are links to pictures of the valve. I think for your problem you will find the issues discussed in that thread enlightening.

  13. #12
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    I will try to check the valve and get back. As for the mechanic, I think he is descent but how do you really trust. Its like finding a good doctor, right. you just never know.....

  14. #13
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    That's why I started going to the dealer. Even if they screw up, they at least have deep pockets and I can call Honda Corp and gripe. Another thing that drove me to the dealer: Looking online at tsbs concerning my wife's previous Civic, I found that I had paid the independent mechanic to fix three things the dealer would have done for free. My dealer just repaired my steering wheel volume controls on my van with 60k on it. Free.

  15. #14
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    OK, just got in from testing. My car has been idling for 20 minutes. Granted it is not that cold out here especially in NE, but I expected my van to be pretty warm. The front is not hot, just mildly luke warm. The rear vent near the sliding door is very hot. Also, I think I located the climate control valve. It has a cable that connects a pin. When I set the temp to 60 it retracts inwards when set to 90 it retracts outwards, not sure other functions for this valve. The hoses above the valve are luke warm while the hoses below are hot. I surmise that the bottom is feeding the back of the van. I don't know much than that. Can anyone help?

  16. #15
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    As I suspected, it seems to be the valve. Even though it moves, it might be clogged. I suggest replacement. And look through your old work orders and see if the mechanic replaced the coolant. he should only have done it with compatible replacement fluid. He could have caused the corrosion that plugged the valve. (like the guy in the other thread)

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