heater problem HELP PLEASE

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Jun 12, 2002 | 07:17 PM

mantta

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From: Keweenaw Bay, MI

heater problem HELP PLEASE

Sep 27, 2002 | 07:51 PM

cfritz

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heater problem HELP PLEASE

heater blows on low but does not blow on med. or high. changed out blower switch but didnt work any ideas on whats wrong and how to fix it. have 77 f-250 w/ac.

Sep 30, 2002 | 06:38 PM

Mil1ion

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heater problem HELP PLEASE

The resisitor is shot.
It is usually located in the heater plenum.

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Sep 30, 2002 | 07:22 PM

kioolt

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Joined: Aug 1999

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From: Bel Air USA

heater problem HELP PLEASE

[updated:LAST EDITED ON 30-Sep-02 AT 08:23 PM (EST)]I wish I still had my diagrams for 77 Ford pickups. But I would suspect that you have a blower resistor problem. It should have four wires on it I believe. You should have continuity between all of the terminals.