2000 Lincoln Navigator Lincoln Navigator front heater problem

Tiny
COLVARDS
  • MEMBER
  • 2000 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
I have replaced both heater cores, blend door actuator, water pump, thermostat and the climate control. If I let the car set after starting it will warm up like normal but once I drive a couple miles it will start blowing out cold air in the front but remains warm or hot in the rear. Please help!
Do you
have the same problem?
Yes
No
Tuesday, February 11th, 2014 AT 1:46 PM

5 Replies

Tiny
HMAC300
  • EXPERT
Sounds like you are losing vacuum and the blend actuator is closing. I'm sending a diagram so start to check for soft hoses starting at engine it may be sucking together closing he vacuum off or there is a leak someplace.
Was this
answer
helpful?
Yes
No
Tuesday, February 11th, 2014 AT 2:58 PM
Tiny
COLVARDS
  • MEMBER
The blend actuator is electronic and the climate control is digital/no nobs just buttons.
Was this
answer
helpful?
Yes
No
Tuesday, February 11th, 2014 AT 3:48 PM
Tiny
COLVARDS
  • MEMBER
Oh and before I put everything back together after changing the blend door actuator I made sure it was working properly. As I raised the temperature setting on the climate control it moved untill closed to allow full heat to come thru
Was this
answer
helpful?
Yes
No
Tuesday, February 11th, 2014 AT 3:52 PM
Tiny
HMAC300
  • EXPERT
Then get it scanned as one of the potentiometers may be screwed up do this test to see if you get any dtc's then if not have it scanned.
Ensure coolant temperature is at least 120 F (49 C) before entering self-diagnostics. Ensure in-car temperature is between 40-90 F (4-32 C). Simultaneously depress OFF and FLOOR buttons, then press AUTOMATIC button within 2 seconds. Display will show a dashed line in the center of the display window for up to 30 seconds while test is running. Record all DTCs as displayed.
If DTCs are displayed, perform test indicated. See DTC INDEX table. If a condition exists but no DTCs are displayed, go to SYMPTOM TESTS.
Self-diagnostics can be initiated at any time with the resulting DTCs being displayed. Normal system operation is stopped when system is in self-diagnostic mode.
If this has a water valve on the car and it might but we never are shown that, see if hoses stay hot at higher rpm. That is vacuum operated and maybe be screwed up it used to be on eof the big things causeing heat problems on ford products. Here are dtc's and what failure is.
B1249 024 (022)Blend Door Actuator Short
B1249 N/A (025)Blend Door Actuator Failure
B1251 031 (N/A)In-Car Temp. Sensor Open
B1253 030 (N/A)In-Car Temp. Sensor Short
B1255 041 (043)Ambient Air Temp. Sensor Open
B1257 040 (042)Ambient Air Temp. Sensor Short
B1261 050 (052)Sunload Temp. Sensor Short
U1073 (2) N/A (N/A)Engine Coolant Temp. Signal
U1341 (2) N/A (N/A)Vehicle Speed Sensor
might also be a broken blend door shaft as these are known to happen as well. Also the heater care cold be plugged, so try back flushing it, may help.
Was this
answer
helpful?
Yes
No
+3
Tuesday, February 11th, 2014 AT 4:03 PM
Tiny
COLVARDS
  • MEMBER
Ok, thank you for the advice. I will try tomorrow and let you know what I come up with. Already tried the back flushing after the problem happened after replacing everything, but again I will let you know tomorrow. Thanks again!
Was this
answer
helpful?
Yes
No
+1
Tuesday, February 11th, 2014 AT 4:22 PM

Please login or register to post a reply.

Recommended Guides