Hot Running Buick
By George Nenadovich
If your Buick is running hot (need to install aftermarket gages such
as Autometer so you know exactly what temp your car runs), anything over
210 with no AC on indicates you have a problem. It is possible with the
AC on and sitting in traffic to hit 210.
There are several problem areas that should be looked into to discover
if they are they problem or a combination of them that are causing high
1. Improper fan, see pics below for proper fan.
2. Fan should have a thermostatic clutch, see pic below.
3. Radiator should be a 4 core (4 horizontal cooling tubes per row)
unit. (3 core is not enough unless you have a high efficiency 3 core)
4. Timing is retarded. DO NOT trust timing marks on harmonic balancer
to set timing. Use a vacuum gage to set timing. Advance timing to maximum
allowed without having ping or hard, hot starting problems. This usually
means about 16-18 inches of vacuum.
5. Make sure distributor is not worn, advance weights are moving
freely (increase timing at higher rpm), vacuum advance is working properly.
6. Remove points set-up and convert ignition to MSD, Mallory, HEI,
Crane XR-i or Ignitor (see picture below)
This is a 5 blade fan with standard clutch. This is NOT the
one to have on your car. This is usually found on non-AC cars.
This is a 5 blade flex fan and is NOT the one to use. These
are notorious for coming apart because after many cycles the fan blades
This is the correct fan to use. It has 7 blades and a thermostatic
Here is a close-up of the thermostatic spring on the clutch.
When the unit is hot it engages the fan so the fan spins all the time. These
do go bad. To check for proper operation. After car reaches operating temperature,
shut engine off. Try to spin fan by hand and it should not make more than
a revolution. Quality thermostatic clutches run about $40-45new. Torqflo
922797 from Autozone for $44 is a great unit to use for all applications.
Non-thermostatic version are about $20. If your fan does not sit inside
the shroud you need a longer t-stat clutch. Use Torqflo 215103 from Auto
Zone. You may have to enlarge the fan holes to bolt the fan to the clutch.
Old Torqflo #922722. Also replaces Hayde 2722 and Four Seasons 36977.
Make sure the springs and weighs are in good shape for the
centrifugal advance. The two small springs seen here can go bad causing
too much advance and ping at higher advance. You may want to retard initial
timing to solve this problem but that is the wrong solution. Install new
springs. Also, check to see the vacuum advance(seen above in lower left
corner) is working properly. Use a vacuum source to see if diaphragm is
good. If not, replace the unit with a new one. Notice no points in this
This is the item to use to replace stock points and maintain
the stock look of the distributor. You can also install MSD, Mallory or
HEI instead of points. The Ignitor is available from Northern Auto Warehouse
for $60. Their contact info is located on the vendors page on this site.