No heat,1997 lincoln mark 8.self test dtc code 155.all funcitons but no heat.whats a guy to do?

USA car or NOT, ?????????? what engine?
with or with out electronics temp control options
I can't see the dash to go ahhhhhhhhhh
EATC for sure has named bend door.
fuse are first are they all good>?/
below 120f coolant the blower is taken off line.
well there are only 2 causes.
one under the hood, engine not hot,. thermostat bad.
two, cam dampers failing. or heater core clogged up. inside.

a tech does simple tests to see which end of car fails
even a finger,test. to the 2 tubes passing the fire wall to the heater core. (ouch,ouch) test tube,1 and 2, are 180f to 220f hot that is good test for engine bay good
and the core is not clogged
if hot /cold is fingered, that is clogged up core.

the first question that pops to mind also is does the cab core have hot water valve. most cars now do not.
i just look at the 2 heater core tubes for water valve and even cable drive or vacuum drive to it.
there is vacuum servo called heater door actuator
or has below EATC

here it is and if dead and stuck in blend cold ,heat ends


what I do is 2 things, (working cab side)
core tubs both hot 180f UP
i watch all damper doors, actions in all modes.
3 or more.
if say blend door is dead, i move it by hand,
some even wire (bailing)wire it to hot and drive all winter.
until spring and fix it then.

yes one has vacuum blend door
and yes other model has gear/motor actuator EATC blend door servo./

what you, nobody knows
but id pull off all lower panels to the dash and look first
sure whole if core is hot, 2 tubes, sure would

seat on drivers side will not heat are cool. ??? Or cool ? Did you take it to a qualified repair shop an have the heated seat control module check for DTC'S - diagnostic trouble code's ? Do you know what those are ? Climate Controlled Seat Module (CCSM) Diagnostic Trouble Code (DTC) Chart
To many to list here .

Attached Files

• 1993 LTC EATC functional Description.pdf (41.6 KB, 8 views)
• 1993 LTC EATC self test.pdf (48.7 KB, 11 views)

These are the files for your Year of car. Can not say if the link will work on this media. If it does not work, do a Browser using these terms 1993 LTC EATC self-test procedures, or similar. The 1993 is the 1st of a group to 1997 or 1998 that have similar systems. So they would activate the same way. There is a good post for 1996 LTC on Edmunds.com that has Code definitions.

This is another site. http://www.youtube.com/watch?feature=player_detailpage&v=hAqE-oYnvlQ

The information you are asking for varies depending on how the vehicle is equipped ie. ENGINE SIZE, AUTOMATIC or MANUAL TRANSMISSION, 2-WHEEL DRIVE, 4-WHEEL DRIVE, ALL-WHEEL DRIVE, etc.
With that said, it also deserves mention that there is a Technical Service Bulletin published by Ford Motor Company that applies to the model year and model that you have listed that involves Diagnostic Test Code (DTC) P0456.

Please note that this bulletin emphasizes the requirement of special equipment to properly diagnose and repair the DTC's listed in the bulletin. Below is a brief (partial) description of the bulletin:

Article No.
03-20-3
10/13/03
DRIVEABILITY - MALFUNCTION INDICAOR LAMP
(MIL) ILLUMINATED WITH DTC'S P0442, P0455,
P0456, P0457, P1442 OR CHECK FUEL CAP LAMP
ILLUMINATED WITH DTC P0457
FORD: 1997-2000 CONTOUR 1997-2002 ESCORT 1997-2003 CROWN VICTORIA, MUSTANG, TAURUS 1998-2003 ESCORT ZX2 2000-2003 FOCUS 2002-2003 THUNDERBIRD1997 F-250 HD
1997-1999 F-250 LD
1997-2003 E SERIES, EXPEDITION, EXPLORER, F-150, RANGER, WINDSTAR
1999-2003 F SUPER DUTY
2000-2003 EXCURSION
2001-2003 ESCAPE, EXPLORER SPORT TRAC, EXPLORER SPORT
LINCOLN:
1997-1998 MARK VIII
1997-2002 CONTINENTAL
1997-2003 TOWN CAR
2000-2003 LS
1998-2003 NAVIGATOR
2002-2003 BLACKWOOD
MERCURY:
1997-1999 TRACER
1997-2000 MYSTIQUE
1997-2003 GRAND MARQUIS, SABLE
1999-2002 COUGAR
1997-2003 MOUNTAINEER
This article supersedes TSB 03-9-8 to update the vehicle lines and Service Procedures.
ISSUE
Some vehicles may exhibit a Malfunction Indicator Lamp (MIL) illuminated with Diagnostic Trouble Codes (DTCs) P0442, P0455, P0456, P0457 or P1442 or a "Check Fuel Cap" Lamp illuminated with DTC P0457 for the Evaporative Emission System. This may be caused by loose or leaking hoses, loose or broken fuel cap, a leak at the top of the fuel filler pipe neck, etc.
ACTION
Use the Rotunda Leak Detector Smoke Machine (Part 218-00001) or equivalent, to locate and repair leaks in the Evaporative Emission System.

Codes are read by hooking up a scanner to the OBDII portal located under the dash on the driver side. There is no other way to read codes on an OBDII system, which were mandated on all cars sold in America from 1996 on.

First error code
P1650 - Power Steering Pressure (PSP) Switch Malfunction In Key On,
Engine Off Self-Test, this DTC indicates the PSP input to the PCM is
high. In Key On, Engine Running Self-Test, this DTC indicates that the
PSP input did not change state. Steering wheel must be turned during Key
On, Engine Running Self-Test
PSP switch/shorting bar damaged
SIG RTN circuit open
PSP circuit open or shorted to SIGRTN
PCM damaged."

P1703 - Brake Switch Out Of Self Test RangeP1780 - Transmission Control Switch Out of Self-Test Range

It is the blower motor,or the blower relay module,near the blower motor,and check the ac/heat control unit,if the blower ,and relay module turn out to be good.

Have you even considered the heater core? Have the heater core checked/replaced. As for the top hose collapsing...that is not good. Have the entire system checked out by a qualified mechanic.

HI, click below to be directed to a full extraction procedure specifically prepared for the ford DTC's.

This link will direct you to a page that will have a step by step guide with pictures on how to extract the DTC via self test Connector.

Click here to start the Self test procedure.

Please rate and god bless:)

No the motor is the problem.