Yo Peeps, Replacing the heater core at the moment and i've noticed the actuator for the heater tap is EXTREMELY stiff, as in i can not manually activate the tap from the actuator at all, the tap works when separated from the linkages however. the other actuator is easily moved to change the vent positions, so im guessing the one in question is seized. Am i right in assuming this (in which case a new heater core wont give me heaters at all) and can i pull the sucker apart and clean it to un-seize it any other advice would be greatly appreciated Thanks Rob
its called a "cock" valve can get new one from nissan or ive got one off a wreck you can have cheap dude !
If it's similar to the mode door actuators then they come apart quite easily. Simmo, not talking about the cock (hehe) valve - but the actuator that operates it.
Do not force the actuator. Rob, the motor is geared down to increase the force so you may not be able to physically turn the controlling motor for the heater valve so do not force it. Instead do what I did if you are confident in electrical work. The motor in designated Air Mix door 1. Details of the connector are found in the FSM on page HA-98. Use a low current 12V plugpack to get 12V to the motor and see if if moves the valve in both directions. ( do not use the cars battery as if you accidently short the wires while doing this test the spark will scare you and possibly start a fire. NOTE ****** because you are controlling the motor and not the Heater controller do not keep the connection to the motor if it is not moving at all. It may have reached the limit of its travel. If so reverse the connections to reverse the motors direction. If it still does not move at all then the motor or gearing is jammed. I did this to test all the motors when I changed my heater core. I also replaced the foam sealing strips as they were disintegrating. MichaelZ
Thanks guys, I'll set up a voltage dropper on the bread board and test this little sucker. It will be disappointing if I have to put the dash back together for work on Tuesday and still have no heaters. Don't you just love working on old cars
We work on old cars because.... of the pleasures like the satisfaction of solving a problem yourself and also saving you money and learning something new and then helping others with the knowledge you have gained. MichaelZ
Well the actuator worked well on the test bench. Glad about that. Heater core in and working well, like really well. Prick of a job, took around 20 hours over three days. Not quite finished have a few trim bits left to assemble but I need at least a couple of hours to relax before starting work again next week.. Need a couple new trim bits too, the dash vent thing disintegrated when trying to remove it, it's not critical tho it can wait.
