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Re: stumped - no/little heat... all vents Posted by pme [Email]  (#1496)  [Profile/Gallery]
(more from pme) on Tue, 10 Oct 2017 05:06:25
In Reply to: Re: stumped - no/little heat... all vents, mlc [Profile/Gallery]
, Mon, 9 Oct 2017 21:04:06
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Certainly couldn't hurt to bleed the system again, mlc, although I would think you've run it enough to circulate any air out by now.
As a possibility, perhaps run the ACC on LO for a while, and feel the metal pipes at the heater core. They should likely not get too hot if the heater valve is indeed actuated and closing off flow (as it should).
Then run the ACC on HI. The valve should open and allow coolant to flow, and get the pipes hot, and maximize flow through the core. Perhaps toggling the valve back and forth between extremes will free up its motion? Just a guess. Otherwise, not much to do other than swap in a new valve and see if its better; they really aren't internally serviceable.
If the valve doesn't change flow as expected, look at the vacuum connections. First, make sure it is connected to the solenoid correctly -- the hose from the Bypass valve should route to the nipple on the solenoid that is at a 90 degree angle to the other two. Second, knowing its connected right make sure that that there is a vacuum and that the solenoid is indeed applying vacuum or not when appropriate. Supposedly: "When the control module grounds the output, the solenoid valve opens and creates a vacuum on the shut-off valve, which in turn stops the flow of coolant." Setting the temperature to LO on both sides should trigger this action
Once you know that the heater core is getting hot, then the only other point is air flow across the core, which points to the blend doors/distribution flaps. Not much else that can be failing.
->Posting last edited on Tue, 10 Oct 2017 05:09:11.
, Mon, 9 Oct 2017 05:56:01, Mon, 9 Oct 2017 06:31:27, Mon, 9 Oct 2017 06:47:03, Mon, 9 Oct 2017 07:16:09, Mon, 9 Oct 2017 21:04:06, Tue, 10 Oct 2017 05:06:25 <-- Viewing This Message, Tue, 10 Oct 2017 06:07:01, Wed, 11 Oct 2017 21:29:41, Thu, 12 Oct 2017 03:05:43, Thu, 12 Oct 2017 06:50:57
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