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  No heat-Mercury Mountaineer 1997 5.0

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Author Topic:   No heat-Mercury Mountaineer 1997 5.0
kcode
Gearhead

Posts: 2729
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 12-07-2002 11:24 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
Is a Mountaineer considered a truck???

Any way, its my daughters truck. She calls me up and complains there is no heat. First thought is the thermostat, had to change out my Explorers for the same reason. Wrong, temp gage is right in the middle and all hoses are hot. I checked the vacuum fittings and everyhing seems to operate directing the air in the right places. The only thing I could not check is the dash dial for temperature. The Haynes manual shows four wires connected to it, I'm sure it operates a valve somewhere that cannot be seen easily. I did not tear the dash apart, but I got a feeling I will before its fixed. Any suggestions on what else to look for????

Mike

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 12-08-2002 04:22 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Is it blowing air out?

Fluid level is where it should be, right?

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 12-09-2002 10:09 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Bring the engine to operating temp,and feel the heater hoses at the heater box. I would check the cutoff solenoid to see if it's stuck,closing off that loop.

[This message has been edited by MLariviere (edited 12-09-2002).]

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kcode
Gearhead

Posts: 2729
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 12-09-2002 10:20 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
All hoses are hot, both lines going through the firewall and the large hose from thermostat to radiator. One thing that does come to mind, when her heat stopped working she called me on the phone and I asked her if there was antifreeze in the reservoir on the inner fender, she said no and then filled it up. Could there be an air pocket in the system trapped in the heater core?? I thought with the closed system any air trapped would clear itself out after the motor had went through numerous heat up and cool downs. I'm at a loss, I don't really want to pull her dash out to change a switch unless its absolutely necessary.

Mike

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 12-09-2002 10:54 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
If the core is getting heat,then there must be a vent door that is stuck or being held shut. Looks like you're going to have to diagnose it visually. Have you tried alldata.com to see if there are some tsb's that refer to this problem? You could get a tsb number,and then call your friendly Ford dealer you go to for advice. So there is absolutely no heat through all functions of controls and all vents? I'd look there,at the heater plenum first. Maybe the blend door and its' controls. The cooling system should self purge.

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 12-10-2002 12:34 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
An air pocket is definitely a possibilty. It is supposed to purve eventually, but you know what 'supposed to' is worth.

You could try bleeding it by loosening a clamp on the return line and see if you get air. Wear gloves, though...

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.

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