Originally Posted by rjtw

Thanks Kevin!

Boaf, the relay we're referring to is at the upper left.

Kevin -- one minor detail, the '83 (and in fact 80-83 as far as I can tell) does not have the infamous relay. That started in 1984 cars. With 80-83, a relay is mounted in that location on the board, but it's a different type of relay and for a completely different purpose. The AC +12V power goes right through the copper trace on the HVAC "slider" directly with no relay involved there at all. Which is even worse, because if there's a high current condition, the copper traces could be destroyed! I installed a relay at the CE panel to take the load in my '83 (triggered by the HVAC) for that reason. For anyone who wants to go down THAT rabbit hole: https://rennlist.com/forums/928-foru...o-78-84-a.html

Originally Posted by rjtw

Hi Boaf,
Please follow the debugging steps outlined above (and read through all those links I posted) before diving in to the hvac unit. However, yes, just the relay can be replaced, it is not necessary to replace the entire hvac unit.