Heater problem

Asked by Feb 01, 2014 at 08:59 PM about the 2002 Ford F-250 Super Duty Lariat 4WD Crew Cab LB

Question type: Maintenance & Repair

Hello I have 2002 f250 7.3 diesel has no
heat blows only one speed and through
defrost but cold would this be vacuum leak
or heater exhange motor thank you in
advance

4 Answers

well....to me it sounds like the blower resistor pack is fried~...because this will only give you "full speed ahead" and none of the lesser speeds~ shopping for it can't find any...will try different search engines...as far as a vacuum leak, we know these butyl-rubber vacuum lines will deteriorate....if in doubt disassemble and replace the chewing gum and coal tar lines with proper silicone rubber ones~

1 of 1 people found this helpful.

http://www.partsgeek.com/fyn6gcq-ford-f250-super-duty-blower-motor- resistor.html? utm_source=nextag&utm_medium=pf&utm_content=wc&utm_campaign=Par tsGeek+Nextag&fp=pp&utm_term=Ford

1 of 1 people found this helpful.

okay what you need to check is the "blend door" for the defroster circuit~ https://www.google.com/search?q=2002+Ford+F- 250&rlz=1C1CHFX_enUS571US571&oq=2002+Ford+F- 250&aqs=chrome..69i57j69i59&sourceid=chrome&espv=210&es_sm=93 &ie=UTF-8#q=2002+Ford+F- 250+defrost+diverter&tbm=shop&spd=10071776584075119709

1 of 1 people found this helpful.
19,965

Ford diesels do not produce enough vacuum to run the heater controls. There is an electric control unit on the right inner fender that produces the vacuum for these. It is bad. Replace the thermostat for heat. It is stuck open. Blower motor resistor is bad for the speeds. Just follow the wires back from the blower motor to it.

2 of 2 people found this helpful.

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