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Hello - I have an 05 Acura TL with no interior heat. The coolant was replaced with the water pump not too long ago and the car engine temp itself seems fine.
I noticed that my heater control valve under the hood doesn't move when I change the temperature from LO to HI. I also noticed that if I manually move it - I get heat!
Could this be a stuck heater control valve or could it be a cable adjustment? I noticed in the repair manual, page 21-79 shows that there is a way to adjust the cable by disconnecting the heater valve cable housing from under the dash. I have NO idea where this is under the dash. Anyone do this before? Is it worth a shot or is it likely just the heater control valve unit that needs to be replaced?
You said it yourself, manually moving the valve low-high you get heat. So the valve isn't stuck, and is in fact doing it's job; when it's open you get heat, closed = no heat. The disconnect must be before the valve, probably the cable.
2 pages before the heater valve cable adjustment, it glosses over "Step 8- Remove the dashboard" (lmao ) so the fact that it doesn't tell you to remove anything before saying "from under the dash, disconnect the heater valve cable" I'm assuming it must be somewhat readily accessible, not completely buried.
At most I'd think you'd need to remove are the center console side pieces next to your legs, since they surround the heater core and hopefully the valve is right behind there. Sorry I can't be of more help.
If I recall correctly, this is visible from under the driver's side dash when you remove the lower panel above the pedals. I am not 100% sure if this was on the driver or passenger side...I was looking at all of my actuators a few months ago and don't remember which side it was on....but I know you can see the blend door actuators from underneath and I think the HCV is tied to one of those.
03-26-2019, 08:30 PM
) so the fact that it doesn't tell you to remove anything before saying "from under the dash, disconnect the heater valve cable" I'm assuming it must be somewhat readily accessible, not completely buried. 
