We have replaced radiator, thermostat, heater core, and still no heat. Any suggestions? Thanks.

 

Sandy,
after it warms up...do the two heater hoses feel hot?
if tehy do, then it could be the heater/air control cable...remove glove box and check the movement..you can remove the cables there; center it and reattach the cable end.
and, if the hoses are not hot; esp the return hose..could be:
blocked inlet hose
water pump
I can't recall if the thermostat can poss. be installed upside down, so...the thermostat is in right?...and engine would not heat up well at all

 

My 1994 Bronco (302) has the same problem. If the outside temp is above say 10F then it will eventually get warm. If it is colder than -10F it will never get warm enough to not see your breath. I was suspecting the fresh air vent is not closing enough. I also never have frosted window problems.

But I have no idea where under/behind the dash to look.

John

 

for the 94:
"Service Bulletin Number: 93248
Bulletin Sequence Number: 076
Date of Bulletin: 9311
NHTSA Item Number: SB035088
Make: FORD TRUCK
Model: BRONCO
Year: 1994
Component: ENGINE COOLING SYSTEM
Summary: HESITATION-ROUGH IDLE-ENGINE COOLANT DOES NOT REACH NORMAL OPERATING TEMPERATURE MEDIUM TRUCKS WITH 7.0L ENGINES. - HESITATION/STALL DURING ACCELERATION DECELERATION. - IDLE - ROUGH - ENGINE COOLANT DOES NOT REACH NORMAL OPERATING TEMPERATURE. - HEATER/DEFROSTER - POOR HEATER OUTPUT - THERMOSTAT STUCK OPEN. COOLING SYSTEM - NEW DIAGNOSTICS FOR ENGINES THAT DO NOT REACH NORMAL OPERATING TEMPERATURE. (FORD TBS 93-24) *TW "
source: http://www.nhtsa.dot.gov/cars/problems/tsb/servicemmy.cfm

and:Service Bulletin Number: 942016
Bulletin Sequence Number: 070
Date of Bulletin: 9410
NHTSA Item Number: SB037464
Make: FORD TRUCK
Model: BRONCO
Year: 1994
Component: HEATER:UNKNOWN TYPEEFROSTEREFOGGER
Summary: HEATER - LOW/NO HEAT WHEN TEMPERATURE **** IS SET AT FULL HEAT. *TW

and:Service Bulletin Number: 96 137
Bulletin Sequence Number: 21
Date of Bulletin: 9606
NHTSA Item Number: SB048450
Make: FORD TRUCK
Model: BRONCO
Year: 1994
Component: HEATER:UNKNOWN TYPEEFROSTEREFOGGER:CONTROL SWITCH
Summary: LOW OR NO HEAT/AIR CONDITIONING-HIGH EFFORT TO TURN TEMP CONTROL ****