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Old 08-21-2003, 01:30 PM
Posts: n/a
Vent System & Overheating - 1979 450 SLC

I have a 1979 450 SLC that I just purchased. I do not have complete maintenance records. Air only moves through the far left and far right vents and the defrost vents. No air comes throught the center 3 vents. Air only moves through the operating vents when the a/c is on. Are there electronically controlled baffles that redirect the airflow? Maybe a vent connection was accidentally disconnected? There is also a problem with the car running hot. I know that work was performed on the cooling system prior to my purchase without success. I have to assume that the mechanic checked the obvious (i.e., thermostat, blockage, etc.). I tested the antifreeze and it is up to par. It was mentioned to me that this could be related to the timing chain???? Do you think there is a relationship in someway between the two problems.

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Old 08-21-2003, 11:01 PM
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Join Date: Jul 2003
Posts: 78
Running hot, bad emissions...

I'd check to see if the ignition timing is correct (sufficiently advanced).
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Old 08-22-2003, 08:15 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
The AC problem is probably vacuum related, the flaps are moved by vac.

Start checking vacuum lines in the engine compartment -- the green plastic lines are for the climate control. You will find that the rubber hose parts that connect the plastic lines are all shot unless replaced recently.

Have a care with the plastic tubes, they will be brittle by now.

Try applying a vacuum to the green line and see if the climate control then works properly -- the fan is switched off if there is no vac in the system.

A large vac leak can make the engine run lean, causing overheating, but I'd bet on a clogged radiator myself, given the age.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 08-22-2003, 08:51 PM
Posts: n/a
I appreciate the input. I obviously have some work to do - - when I can find the time. Lucky that this is not my primary transport.
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