Hello everyone. I have a weird question with my 69 Firebird with a/C. When I first start my vehicle I could turn the air on through all speed even up to high but then after 30 seconds the high option quit working but all the other ones remain working. Is this a relay thing? I thought it might be so I went to replace the relay but noticed the relay that I have only has three spade connectors when I go online to purchase a new one all the ones down there have four spade connectors. So I have two questions number one is this really a really issue I’ll check both the relay and the resistors. And second do I have the correct relay or wiring or is this an aftermarket? I’m the second owner of the vehicle but I think the A/C is original.