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1998 Lincoln Mark VIII Question: What causes the heater not to blow hot on my 98 mark viii? It only blows cold.

 

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lowlinc, Fort Worth, TX, January 08, 2014, 14:00
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The test code shows 888 which is a pass. What could the problem be?

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  • Answer #1

    G. T. Service Center (4071 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 08, 2014, 14:11
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    If the coolant is full, and the heater core is hot at operating temperature, then you possibly have a temp/actuator bad.

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    lowlinc, January 08, 2014, 14:18
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    Thank you for your quik reply. Where is the temp/actuator located and how do I test if it is bad?

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    ProfessorG, January 08, 2014, 15:01
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    OK the actuator is located on the right center on top of the heater box. If you drop the glove box all the way down, dump the excess junk, that's what I see all the time. Any way if you look toward the left at the center, there will be an actuator, plastic box, bolted to the top of the heater box. The space between has a black rod at a right angle wrapped around the control door rod. While adjusting, with the key on, the hot to cold control, the rod should turn back and forth slightly while changing the door from heater to A/C. Let me know.

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    lowlinc, January 09, 2014, 15:39
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    I took my car in today and had a new radiator and thermostat installed. The blend door actuator is working but still no heat?

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    ProfessorG, January 09, 2014, 16:57
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    I had to look back; As I commented on the first post, "if the coolant is full and the heater core is hot", it could be your heater core. Have you not had your heater core checked. You had a radiator and thermostat installed, for whatever reason, and the heater core could be restricted. I'm only 70 miles away from you, and would/could have made your heater work for less money.

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    lowlinc, January 09, 2014, 17:06
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    I had to have the radiator replaced because it had a split on the side. I wanted to get a new radiator instead of trying to fix the old one. How much would it cost for you to fix the heat?

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    ProfessorG, January 09, 2014, 17:12
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    If it only takes a flush of the heater core, it would be $35.00.

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    lowlinc, January 09, 2014, 17:21
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    That sounds good. Would Sat. the 18th be conenient for you?

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    ProfessorG, January 09, 2014, 17:26
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    Well I'm not usually there on Sat-Sun. We could discuss it closer to the date and see if we could make it work.

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    lowlinc, January 09, 2014, 17:33
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    Ok. I,ll know more in regards to my schedule at the beginning of the week. Hope to get it fixed soon.Brrrr It's cold! HaHa!

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    ProfessorG, January 09, 2014, 17:35
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    This weekend and next week looks pretty good next week according to Fox4, Yea!

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    lowlinc, January 09, 2014, 17:39
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    Thur. or Fri. would be best for me.

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    ProfessorG, January 09, 2014, 17:46
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    Ok let's make it happen. I'm there between 7:30 and 4:30. Let me know when and I'll make it work.

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    lowlinc, January 09, 2014, 17:50
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    Thanks alot! I'll be intouch with you Wed. evening. Where are you located?

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    ProfessorG, January 09, 2014, 17:56
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    Click on my name professorg and it will show you my contact info.

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    lowlinc, January 09, 2014, 18:09
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    Got the information. Thank you so much for your time. I'll get with you on Wed.

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    ProfessorG, January 09, 2014, 18:10
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    Ok

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  • Answer #2

    jpaul April 19, 2014, 21:19
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    In my experience, the blend door actuator is broken. When you activate your heater, the blend door rotates to direct the air through the heat exchanger to warm/heat the air. There are plenty of instructions online for do-it-yourselfers. If you have it done by a shop, it will be expensive, the parts are cheap, but it is labor intensive.

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