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A/C blows warm air

Tiny
ENDIE
  • MEMBER
  • 1 POST
  • 1993 LINCOLN TOWN CAR
  • 180,000 MILES
It all started when I was honking the horn and it stuck, so I disconnected the battery for awhile and reconnected but the car wouldn't start. Replaced the battery and these things stopped working: radio antenna wouldn't go up and down and when I turned on the stereo the antenna motor would strain and you could hear it - so kept radio off, trunk lid electric latch wouldn't take trunk lid all the way down, no cruise control, and the worst out of all this my a/c which always worked great wouldn't work when I needed it. When it is below 70 degrees out it blows cold air (just like it always did). But, if it gets any warmer out it just blows hot air. Is this some kind of a "reset" problem, a fuse problem.I have had it checked by several mechanics but they couldn't explain this mystery. I have been unemployed now for 2 years and cannot afford to get any other assistance with this problem. Please help.
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Only thing that comes to mind is to check the grounds.
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
WSCHLOBOHM
  • MEMBER
  • 2 POSTS
  • 1989 LINCOLN TOWN CAR
  • V8
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
I have a 1989 Lincoln town car Cartier and the a/c blows cold and hard at idle but when I accelerate it blows out less and hotter I checked freon its good and I just cleaned the evaporator core I checked all the vacuum lines and soup can all good
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is your vehicle equipped with automatic or manual HVAV system?

Symptom indicates a possble fault with the air blend doors and it could be related to vacuum losses during acceleration.
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
CDANATIVECHICK25
  • MEMBER
  • 2 POSTS
  • 1988 LINCOLN TOWN CAR
  • 200 MILES
The defrost doesn't work either and it's freezing here where Ii live. So when I turn on the heater or defrost in my car it blows warm air for about a second and then switches over to cold. The air doesn't seem to be very strong. I've changed the Thermostat so I know it isn't that. I had some issues with the heater core last year and if i'm not mistaken that was replaced. It is very cold where I live this time of year and would like to resolve this as soon as possible
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,200 POSTS
Hi:
Check this for me and let me know the results.

Start the engine, turn the heater on. Allow the engine to warm up to normal operating temp. Feel both heater core hoses. Are both hot?

Let me know.
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
CDANATIVECHICK25
  • MEMBER
  • 2 POSTS
So the hoses do get hot. What does that mean? Someone suggested that I flush my heater core. How do I do that? Are there kits available?
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Monday, July 13th, 2020 AT 1:42 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
THAT MEANS WATER IS CIRCULATING THRU THE HEATER CORE---THE HEAT IS THERE, JUST NOT GETTING TO YOU. CORE, IS MOST LIKELY FINE!

THE PROBLEM MUST LIE WITHIN THE HEATER BOX UNDER THE DASH

I KNOW LITTLE ABOUT YOU RIG. IMMA REAL JEEP CJ KIND GUY (CJs USE MANUAL CABLES TO OPERATE MR. HEATER)

HEATERS HAVE "TRAP DOORS" (MAYBE MORE THAN ONE) WHICH DIVERT AIRFLOW TO YOUR WINDSHIELD, FACE, FEET, SOMETIMES BETWEEN "HEAT" AND "A/C"

THESE DOORS, OVER THE YEARS, USED MANUAL (W/ YOUR FINGERS!), CABLES, VACUUM, AND ELECTRICITY TO OPERATE THEM

HERE'S THE THING--DOOR MAY BE BROKE OR STUCK, CABLE STUCK OR BROKE, VACUUM DISCONNECTED, OR A MOTOR BAD OR NO SIGNAL REACHING IT (WHICH THEN COULD BE A FUSE, SWITCH OR WIRING ISSUE

WHATEVER MAY BE THE CASE!

SO I'M GONNA HOOK YOU UP WITH ONE OF THE BEST "MONKEY SEE, MONKEY DO"! RESOURCES I KNOW OF!

OTHER SUGGESTIONS YOU MIGHT SEARCH WITHIN ARE TO INVESTIGATE SIMILAR FORD, MERCURY CAR VIDEOS OF THAT ERA, YEAR/ MAKE/ MODEL/ HVAC/ BLEND DOORS/ HEATER/ ACTUATOR/ MOTOR/ ETC. OR COMBINATIONS, YOU'D BE SURPRISED AT WHAT YOU CAN FIND ABOUT ANYTHING.

LET ME KNOW IF YOU COME UP W/ SOMETHING AND GET 'ER DONE!

SOMETIMES (NO PROMISES) WE CAN GET DIAGRAMS THAT MIGHT SHOW THE COMPONENTS

KEEP US POSTED

THE MEDIC
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Monday, July 13th, 2020 AT 1:42 PM (Merged)

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