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What causes the heater not to blow hot on my 98 mark viii? It only blows cold.

(1998 Lincoln Mark VIII)
in Fort Worth, TX on January 08, 2014
The test code shows 888 which is a pass. What could the problem be?
Displaying 2 answers & 16 comments
Popular Answer
of G. T. Service Center on January 08, 2014
If the coolant is full, and the heater core is hot at operating temperature, then you possibly have a temp/actuator bad.
on January 08, 2014
Thank you for your quik reply. Where is the temp/actuator located and how do I test if it is bad?
of G. T. Service Center on January 08, 2014
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.
on January 09, 2014
I took my car in today and had a new radiator and thermostat installed. The blend door actuator is working but still no heat?
of G. T. Service Center on January 09, 2014
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.
on January 09, 2014
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?
of G. T. Service Center on January 09, 2014
If it only takes a flush of the heater core, it would be $35.00.
on January 09, 2014
That sounds good. Would Sat. the 18th be conenient for you?
of G. T. Service Center on January 09, 2014
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.
on January 09, 2014
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!
of G. T. Service Center on January 09, 2014
This weekend and next week looks pretty good next week according to Fox4, Yea!
on January 09, 2014
Thur. or Fri. would be best for me.
of G. T. Service Center on January 09, 2014
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.
on January 09, 2014
Thanks alot! I'll be intouch with you Wed. evening. Where are you located?
of G. T. Service Center on January 09, 2014
Click on my name professorg and it will show you my contact info.
on January 09, 2014
Got the information. Thank you so much for your time. I'll get with you on Wed.
of G. T. Service Center on January 09, 2014
on April 19, 2014
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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