Heater blows cold
Administrator
Joined: 10-13-2011
Posts: 40,083
From: Welland,Ont Canada
Senior Member
Joined: 08-03-2010
Posts: 3,564
From: Lake Ronkonkoma, N.Y.
Don't know the logic how the control panel works. I'm guessing the heat level dial is a variable resistor that would send info to the control valve via maybe the BCM?
It was said early that the heat fluctuated no matter where the air was coming out of, floor or windshield.
It was said early that the heat fluctuated no matter where the air was coming out of, floor or windshield.
Thread Starter
New Member
Joined: 01-15-2017
Posts: 28
From: Santa Cruz, CA
Ok......earlier this morning I started the car, saw the actuator go to the hot side and the heater got warm. I will monitor it over the next day or two and see if the coolant level goes down and the heater stops working.
Administrator
Joined: 10-13-2011
Posts: 40,083
From: Welland,Ont Canada
I don’t recall any mention of the symptoms of a blown head gasket in the thread
Overheating
White smoke out the tailpipe
https://gobdp.com/blog/how-can-i-che...n-head-gasket/
So I’m still thinking burp that baby!!
Overheating
White smoke out the tailpipe
https://gobdp.com/blog/how-can-i-che...n-head-gasket/
So I’m still thinking burp that baby!!
Member
Joined: 04-03-2010
Posts: 59
From: Wisconsin
How would air in the system cause the blend door to move? Once the control is set, the blend door should stay in position. Full heat is full heat. HHRs don't have automatic temperature control.
I would take the connector off the blend door and lock it in position. If the heater continues to blow hot air, the problem is not in the cooling system. If the actuator is a motor, it should stay in position with the electrical disconnected. If it does, something is sending power to move it.
I would take the connector off the blend door and lock it in position. If the heater continues to blow hot air, the problem is not in the cooling system. If the actuator is a motor, it should stay in position with the electrical disconnected. If it does, something is sending power to move it.
Senior Member
Joined: 09-16-2013
Posts: 1,408
From: Tampa, Florida
Because heat is transferred to the cabin by pulling air through the heater core when its full of HOT WATER. You cant get hot air in the cabin if there is no hot water in the heater core, believe it or not. Since the core is highest point of cooling system, if the system is low or leaking (or has an air bubble trapped in the heater core), you wont have enough coolant running through the heater core, thus no hot air!