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2006 Accord no heat #5231820 10/06/19 09:26 AM
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greenjp Offline OP
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Yesterday I did a drain and fill of my 2006 Accord sedan's coolant. It's an EX with leather, 4 cylinder, stick shift.

After the fill I had the engine running, it got up to temp, fans on, and then I switched the HVAC to Hi heat. No heat. Cold air out all the vents regardless of temperature setting, what vents selected, driver passenger side mix. I haven't run the heat since last winter when it worked fine.

The car gets up to temperature fine and the thermostat behaves as expected. I did a bit of research and found some info on the heater control valve, which is the valve that opens the flow to the heater core. This is opened and closed by a wire that I gather is actuated by something under the dash, perhaps the blend door motor?

Speaking of that blend door motor, I replaced it last spring as it was doing the back and forth hunting with grinding sounds. It fixed that problem but I do occasionally still get the behavior where it'll blend in more hot or ambient air that it should for a given temperature. I can "solve" this by setting the temperature low and slowing bringing it back up. I dunno if all of this is related shrug

I cycled the temp from Lo to Hi and noted that the cable doesn't move and thus neither does the heater valve. It is stuck at about 10:30, which I gather is half open half closed? I tried moving it either way with my fingers but could not get it to move with moderate force. Likewise the cable is on there pretty good and wouldn't come off with a moderate tug.

Any ideas?

jeff

IMG_0281.jpgIMG_0282.jpg
Re: 2006 Accord no heat [Re: greenjp] #5231825 10/06/19 09:30 AM
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bullwinkle Offline
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Does it have a slide lever for hot/cold, or is it electronic? Unfortunately my experience is with older Civics ('89, '90, nephew's '97), it was mechanical. If it's electrical, maybe the motor moving it has gotten stuck?


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: 2006 Accord no heat [Re: greenjp] #5231839 10/06/19 09:49 AM
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JohnnyJohnson Offline
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Along with some new heater hose this is likely your answer.

https://www.amazon.com/UAC-HV-1228C...eywords=heater+control+valve&sprefix

But first clean it up and use some good penetrating oil on it.

Last edited by JohnnyJohnson; 10/06/19 10:03 AM.

2004 Corolla 140120
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77077
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: 2006 Accord no heat [Re: greenjp] #5231841 10/06/19 09:52 AM
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Warstud Offline
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Compare the temp of the hose.... going in and going out of the HCV. If after getting the vehicle up to temp and the hose going from the HCV to the heater core is cold you may have a bad HCV.

Re: 2006 Accord no heat [Re: greenjp] #5231848 10/06/19 09:59 AM
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Chris142 Offline
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Pop the cable out of it's holder and manually move the lever.


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Re: 2006 Accord no heat [Re: greenjp] #5231850 10/06/19 10:00 AM
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Dave9 Offline
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Clean the grime off the valve, especially where the cable connects so you can get a better look at it. I can't tell for sure from the pic but it looks like the valve lever has a stud so maybe the cable slips onto that from the end (and might be easier to get off if the cable sheath is taken out of its mounting bracket a few inches away in the pic), or is there a hole or groove and a lock nut?

Get the cable off and see if it then moves, and if the valve moves by hand.

One or the other seems seized and if it's the valve you probably need to remove and replace or attempt to clean it. If the cable you need to figure out if the other end is actuating since it looks good on this end.

Last edited by Dave9; 10/06/19 10:03 AM.
Re: 2006 Accord no heat [Re: greenjp] #5231855 10/06/19 10:02 AM
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NormanBuntz Offline
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Sounds like JJ is on the right track. Should be an easy repair.


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2017 Toyota Camry XLE, 12K, 2nd owner
2007 Honda Ridgeline RTS, 98K, original owner
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Re: 2006 Accord no heat [Re: greenjp] #5231873 10/06/19 10:23 AM
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mk378 Offline
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That is the fully closed position. Do what Chris142 said. If the hot/cold control does something (due to the blend door), the other end of the cable is probably not attached or attached wrong after your motor replacement.

Once you get the valve open you will probably need to top up the radiator since there's air in the heater core that didn't come out yet.

Last edited by mk378; 10/06/19 10:24 AM.
Re: 2006 Accord no heat [Re: mk378] #5232599 10/07/19 04:43 AM
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greenjp Offline OP
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Thanks everybody. I didn't have much time for it yesterday so just fired some WD-40 on it to clear the grime, yet the cable didn't want to come off without tools. At some point in the next couple of days I'll get it off and see if I can move the valve manually and if the cable moves in response to the temperate setting.

jeff

Re: 2006 Accord no heat [Re: greenjp] #5232616 10/07/19 06:00 AM
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greenjp Offline OP
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Update - 20-25 minutes in to my 30 minute commute this morning I noticed some warmth coming through the vents (the temp was set to 70 and it was 70 outside), cranked it up and voila, hot air. Lowered it down and got cold out of both, raised it back up and hot again. I'll test it out again on the way home and check under the hood when the sun is out.

jeff

Re: 2006 Accord no heat [Re: greenjp] #5233125 10/07/19 04:06 PM
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greenjp Offline OP
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Well the problem either magically solved itself, or the WD40 loosened some gunk that had it stuck, because the valve appears to be working correctly now. Popped the hood this afternoon and had the kids cycle the temp from Lo to Hi and sure enough the cable was able to move it back and forth between the two positions in the photos.

The coolant is halfway between the Min and Max lines in the overflow tank when hot - I believe this is an OK level, or should I top it off to Max? If so should that be done hot or cold or does it matter? Thanks everybody,

jeff

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Re: 2006 Accord no heat [Re: greenjp] #5233134 10/07/19 04:15 PM
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mk378 Offline
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Don't just check in the tank. Park on level ground or facing uphill (that is you don't want it facing downhill, that way the radiator will be the highest point) and wait until completely cold. Then open the radiator-- if it is not all the way full top it up.

Last edited by mk378; 10/07/19 04:16 PM.
Re: 2006 Accord no heat [Re: greenjp] #5234297 10/08/19 08:52 PM
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greenjp Offline OP
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Last update, I think smile I checked the level via the radiator fill and found that it did require another 1/3 of a gallon or so. Weird because the drain took just under a gallon out, and the fill took about 1.4 gallons shrug Anyway that extra bit definitely affected how quickly heat became available, as it was blowing warm in just a couple of minutes rather than the 10+ observed in the previous few drives. Thanks everybody.

jeff

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