I HAVE A 98 5.4 ltr LINCOLN NAVIGATOR THAT BLOWS COLD AIR WHEN HEATER IS ON. HOSES DONT GET HOT, NEW THERMO, NEW CAP, FLUSHED RADIATOR, AIR BURP AND ENGINE NEVER REACHS TEMP. NO LEAKING OR OVER HEATING
Check for a clogged heater core. Try back flushing it to see if it clogged.
The other thing to check would be the air mix doors. Ensure they are opening and closing correctly.
March, 3, 2012 AT 12:02 AM
BACK FLUSHING TOMORROW, BUT WITH THE BLEND DOOR WLDNT BOTH HOSES BE HOT
March, 3, 2012 AT 12:22 AM
Yup, you are correct about that, so flushing the heater should be the thing to do first.
March, 3, 2012 AT 2:07 AM
He is flushing tomorrow thanks any thing else no matter how small thanks
March, 3, 2012 AT 11:39 AM
Since both hoses are not hot, I believe the passage is clogged somewhere and as thermostat had been replaced with no overheating issues, I have nothing to add to the above.
Just ensure the coolant level is correct and there are no air trapped in system after the replacement of thermostat etc.
March, 5, 2012 AT 9:21 PM
March, 6, 2012 AT 12:43 PM
Has the problem been resolved?
March, 6, 2012 AT 4:00 PM
NO THE MECHANIC HASNT HAD TIME SINCE LAST WEEKEND TO WORK ON MY CAR 3 WEEKS NOW AND ALL HAS BEEN FINISHED IS SUSPENSION NEEDLESS TO SAY ALITTLE FRUSTRATED BUT TOOK IT TO UNCLE (MECHANIC) AND HE IS SAVING ME A LOT OF MONEY SO I CANT REALLY LOOK A GIFT HORSE IN THE BUTT CAN I. THAT IS LIFE I SUPPOSE. BUT THANK YOU FOR ALL YOUR SUPPORT AND HELP
March, 6, 2012 AT 4:12 PM
Hope it is nothing major and can be easily resolved.
Have a nice day.
December, 21, 2015 AT 10:57 PM
DI' d the problem got fix by just flushing the heater core?