1978 air conditioning
Thread Starter
Heel & Toe
Joined: Dec 2003
Posts: 17
Likes: 0
From: Tuscaloosa Alabama
1978 air conditioning
Since I bought my car the air conditioning or heater hasn't worked. The man I bought the car from said all it needed was charging the system. The blower however does not work for air or heat so is this really one of the problems I have? Nothing happens when I turn the fan on High. Could someone please point me in the right direction as to what I need to check out first.
Thanks
Thanks
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
That's what they ALL say..."it just needs charging." Yeah, right. After a thousand dollars, my system works fine!
There's a blower relay near the heater box at the right rear of the passenger compartment. It might need replacing. Check fuses, too.
There's a blower relay near the heater box at the right rear of the passenger compartment. It might need replacing. Check fuses, too.
Racer
Joined: Apr 2004
Posts: 271
Likes: 0
From: Alpharette GA
First on the fan check the fuse, then the switch. The A/C system is a whole problem on it's own, has it been left open to the enviroment? a lot of damage to the system can occured if this has been done, if not you could get lucky and just need a charge, but I rank that up there with hitting the loto.
Good luck
Good luck
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
Originally Posted by 78vettman
Since I bought my car the air conditioning or heater hasn't worked. The man I bought the car from said all it needed was charging the system. The blower however does not work for air or heat so is this really one of the problems I have? Nothing happens when I turn the fan on High. Could someone please point me in the right direction as to what I need to check out first.
Thanks
Thanks
You've got three systems to look at that can go wrong, one of which is the blower as described above. The second is A/C recharging and the third is the A/C heat controls. This is separate from the blower and operates by engine vacuum and is the slide levers that open and close the plenum doors. If this works...you can hear the doors open and close and some hissing.
Even in the off position, air is constantly being blown so check to see if any air is moving I would also suggest if you plan to diagnose on your own...get the 78 Passenger shop manual.
Instructor
Joined: Nov 2001
Posts: 175
Likes: 0
From: St Louis MO
If the fan blows on low only I would check the resistor that is on the engine firewall on the passenger side which is on the top of the housing where the evaporator core is located. If that is o.k. I would check that the connector is attached to the selector on the console. The fan will run only in low if the selector is in the off position. Hope this helps
