1981 Datsun 720 Heater Won't Run

1981 NISSAN
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DAVIDSEATTLE
  • MEMBER
  • 1 POST
Hi,
'81 Datsun 720 P.U. I had some engine work done now the heater won't run. I checked the htr. motor with a jumper and it works. There are 2 relays above the fuse block near the light fuses., but I'm not sure if a relay is the problem. I have a Chilton Manual and it says relays are grouped in the engine compartment at the right fender area. None there. No power at the 3 speed sw. all fuses are good. Does the hot wire go directly to the motor and ground through the switch? Help Please. Thanks Davidseattle
Feb 2, 2007 at 2:38 AM
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BILLYBOB
  • ✓Experienced Mechanic
  • 27 POSTS
my truck did the same thing ! jumper worked just like you said i went out and bought a 2 speed toggle switch wired it up very simple attach where you want and that will fix your problem i promise you!!
Nov 8, 2011 at 2:33 PM

Suggested Repair

The blower motor tested good with a jumper, but there was no power at the factory three-speed switch. A similar case was fixed by installing a two-speed toggle switch and wiring it in as a simple replacement control.

Conversation Summary

The owner of a 1981 Datsun 720 pickup said the heater stopped working after engine work. The blower motor ran when jumped, all fuses were good, and there was no power at the three-speed switch. Relays near the fuse block were noted, but none were found where the manual indicated. Another owner reported the same symptom and said wiring in a two-speed toggle switch fixed it.

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