Mustang 428 Cobra Jet Registry Forum

Discussion => Restoration Tips & Techniques => Topic started by: corbins on March 18, 2019, 08:26:28 pm

Title: heater
Post by: corbins on March 18, 2019, 08:26:28 pm
Crazy question, but I'm needing a heater resistor. Problem is only the a/c version is reproduced for some reason. There must be a difference, but since the non-air one is apparently NOT reproduced, I'm wondering if the a/c one is applicable to both ???  Anyone know or want to venture a guess?
69 non-air, 4-spd cj car. Mustang

Thanks
Title: Re: heater
Post by: redscj on March 18, 2019, 08:40:20 pm
     Not an electrical guy but I'll throw out a worthless idea. If the blower motors are the same then I would suspect that the resistors are the same. Whether they fit in the same slot(?) Needs to be determined.  Not my parts to let the smoke out of but if you have or can get a spare blower motor at a reasonable cost. Give it a try. If the draw is too much? I suspect that the fuse would protect the blower. Be sure to check it for overheating when you give it a try. Hey, what do I have to lose here?;D
     Is there any kind of data on the old one that might indicate it's rating? Try comparing this rating to the repro ones. Best of luck.
Title: Re: heater
Post by: Chris Teeling on March 18, 2019, 10:18:31 pm
FWIW, this is a 1968 standard (non AC) blower resistor.
Title: Re: heater
Post by: Brian Conway on March 18, 2019, 11:02:59 pm
This is the 69 non AC.  Same plug arrangement.    A wiring diagram should tell the tale ?  Brian
Title: Re: heater
Post by: corbins on March 19, 2019, 09:28:13 am
Thanks Guys... it just doesn't make sense t me that they would repro the a/c one and not the other, UNLESS that one is also useable for the non-ac application.
And if only I was smart enough to read a wiring diagram  ???
Title: Re: heater
Post by: Brian Conway on March 19, 2019, 10:25:57 am
I see no difference in the resistors in this diagram.    What year car are you working on ?  Brian
Title: Re: heater
Post by: rockhouse66 on March 19, 2019, 02:49:34 pm
Is this a 2-speed versus 3-speed thing?
Title: Re: heater
Post by: corbins on March 19, 2019, 07:20:04 pm
I see no difference in the resistors in this diagram.    What year car are you working on ?  Brian
Brian, its a 69 CJ car, I'm leaning to the fact that the quote "a/c" is interchangeable for both a/c and non-a/c , or someone would be repoing that non-a/c one I believe. Thanks for posting the diagram.
Title: Re: heater
Post by: Chris Teeling on March 19, 2019, 09:18:24 pm
Based on that wiring diagram, the AC portion of the circuit is separate from the blower power circuit so the same blower resistor could be used for either.

The resistor is configured to work with either a 2 speed or 3 speed blower switch based on the inclusion of or deletion of the medium speed connection from the switch to the resistor block connector.

Title: Re: heater
Post by: Vcode on March 20, 2019, 06:10:50 am
The MPC lists C8OZ-18591-A  (69 w/Heater)
Title: Re: heater
Post by: corbins on March 20, 2019, 08:21:50 am
Thanks all !!! I'm just gonna give that "a/c" one a shot and see. Whats the worst that could happen? Burn a freshly restored car to the ground  :( ?
No, I won't let that happen ….
Thanks again !!