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Heater Problems
New User
Apr 1, 2009, 10:01 AM
Post #1 of 9
(1802 views)
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1997 Mercury Mountaineer AWD 5.0 V-8. Heater controls not working properly. Stuck on hot no matter the setting. Need information on Electrical and Vacuum System to diagnose the problem. It could be the switch but I don't wish to throw money and parts at the Auto to possibly fix the problem I want to be sure is nthere a relay and where the owners manual shows none.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2009, 5:50 PM
Post #2 of 9
(1789 views)
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I think this uses a heater control valve for hot water incoming (inlet hose) to regulate heat. It might be stuck open. I'd try unplugging it and see if there's a change for now. If so if may be the issue - not sure what the default is for it but wouldn't guess full heat but might be??
Looks like this.......
 T
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Heater Problems
New User
Apr 2, 2009, 7:25 AM
Post #3 of 9
(1777 views)
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The coolant valve is new and operates fine I need to know if there is a selonoid that controls the Vacuum to the valve for the reostat is electrical. Also need to know if there is a relay controling this system and where it may be located at and if there is a way to test the wireing for power at the switch to see if the switch may be bad the switch is electrical and is there a control selonoid controling the temp control electrical over vacuum to see if it is bad also. It may be just the control Switch but to know that I need to be able to jumper the wires in the plug to rule out the switch but if I have no power there I need to backtrace the wires to find the relay or fuse or broken wire that may cause this condition. If its Vacuum then I need to know where the selonoid/valve is located at to look for restiction or bad Valve or leak no leaking sound is apparent. Thank You
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Loren Champlain Sr
Veteran
/ Moderator
Apr 2, 2009, 4:46 PM
Post #4 of 9
(1769 views)
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The heater control valve is closed by a vacuum signal when the A/C is turned on. If you are not getting vacuum at that point, start looking for a vacuum leak.
The blend doors are also activated by vacuum, but if your system is using a heater control valve, that is what controls the hot water entering the heater core.
Loren
SW Washington
(This post was edited by Loren Champlain Sr on Apr 2, 2009, 6:03 PM)
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Heater Problems
New User
Apr 5, 2009, 6:23 AM
Post #5 of 9
(1748 views)
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The Heater Valve is operating fine no Vacuum Leak It is not in the A/C system its in the blend door system and I need to know how the electrical control switch is controling the vacuum to the blend door actuator for that is where the problem lies. Thank You
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vandy
User
Apr 8, 2009, 10:00 PM
Post #6 of 9
(1730 views)
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The heater problems can be solved by using proper coolants in the engine.
Link removed...Not allowed
(This post was edited by JIM N on Apr 8, 2009, 10:04 PM)
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Loren Champlain Sr
Veteran
/ Moderator
Apr 9, 2009, 5:11 PM
Post #7 of 9
(1718 views)
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Really? Hmmmm.
Loren
SW Washington
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 9, 2009, 5:35 PM
Post #8 of 9
(1717 views)
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Vandy said so, so it must be the cure all. Get with the program Loren!
T
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Loren Champlain Sr
Veteran
/ Moderator
Apr 9, 2009, 5:59 PM
Post #9 of 9
(1712 views)
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Ahhhh. Good 'ol Vandy. I thought I remembered him! Ya know, he reminds me of my mother in law. Hmmmm.
Loren
SW Washington
(This post was edited by Loren Champlain Sr on Apr 9, 2009, 6:01 PM)
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