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The earlier vacuum-modulated water valves were plastic, although the replacement industry had some metal versions. The cable-operated valves were all metal. What I did on our '72 was to move the heat lever just past the click and reset the water valve to closed, with the heat lever in that...

On our '72 Newport Royal, the Chrysler service manager explained the heater water valve cable routing, which is different than prior body series cars. He noted that the cable was a two-piece cable. This was needed as there was now an a/c compressor switch in the works. I had noticed that when...

There are many Sandens in existence, but I believe it is the 508 that everybody sells for RV-2 upgrades. There is even a "back" where the lines come out horizontally rather than the "bug antennae" we normally see. CBODY67

There are also some threads in here on converting to the Sanden compressor, with pictures. Check the thread by "TxDon", as he did the compressor and related lines on his '66 Monaco wagon. CBODY67

Check the installation torque specs for the balancer bolt. Might need to use a long breaker bar to get the bolt broken loose, then a torque wrench to reinstall it when done.

Make sure the blower fan wheel matches the design rotation of the motor.

The original recommendations on "gas" was to start with 20% less gas than the R-12 spec, then slowly add gas until cooling got the coldest and then stop adding gas. The usual result was approx 90% of the R-12 spec charge. An IR heat gun can work for this. R-134a is more sensitive to...

If an a/c system originally designed for R-12 can work on R-134a, no real reason that your AT-II system can't do the same. I know there are some differing orientations on keeping R-12 or converting, btaim. As to conversion and the items used, that can depend upon how original you desire to...

Before you start tearing into things, consider that the hvac ducting is "slip-fit", possibly having some soft foam filling the saps in earlier times. So "leakage" can occur. Possibly some "duct tape" might help the velocity and volume get to its intended locations? It is possible that the...

IF you want to replace the pump as an investment in not having to worry about it again and with no knowledge of how long it has already been there . . . just to make sure and then have a new baseline time to deal with, changing it while there can be an option. The other thing, according to...

Small = 2.19" diameter B/RB size + 2.49" diameter.

If they are the same diameter as for a B/RB motor, that would probably be their main application, with a 195 degree F rating. If they are smaller than the B/RB diameter, they will also fit GM cars and 1980 and newer Chrysler LA motors, at 195 degree F rating. Not sure of the Ford thermostat...

Most serpentine belt systems do not have an engine-driven fan, using a "puller" electric fan and such instead, only. In looking at electric cooling fan items for a while, I have noticed all sort of fan designs. Some with straight, angled blades, some with S-shaped blades, two fan systems (one...

How about some diagnostics? IF allowed to, how far past 225 degrees F will it go if you let it? Is the car sitting still at those times? Does it cool back down once moving? What is the hot base idle speed set at? What ambient temperatures or does it do this on cooler evenings? How full...

There are a few things at play here. One is the physical dimensions of the radiator and another is the cyclonic fan system you have. From the literature I've seen on aluminum radiators, they apparently are not all built with the same "guts" in tbhem. As to width of the tubes, not just the...

On my '66 and '67 Newport 26" radiator factory a/c cars, the fan sticks out of the shroud about an inch. Still plenty of room to clear the a/c clutch. In every reference I've seen, it is recommended that the fan stick out of the shroud a bit. If it is too far inside of the shroud, its...

All the fan switch does is change the circuits going to the particular section of the blower motor resistor, nothing more. The blower motor resistor will always be in the a/c case where moving air from the fan can cool the resistor coils. Easy to find as it has three connectors close to each...

The part number series would tend to indicate a 1980s application. Which might ALSO retrofit back into prior decades. Generally as below . . . 2______ 1960s 3______ 1970s 4______ 1980s IF a "1" or "2" series number is on a later model listing, that means it's been used for a good while...

With the fan shroud, the issue is placement of the fan within the shroud and how much "sticks out" on the engine side of things (like about 1/2 of the fan itself?). Nearness to the radiator is also important in order to get a more uniform pull on the air, through the complete radiator rather...

Of all of the coolant recovery systems which have been on cars since the earlier 1970s, I have not observed them to cause earlier radiator failure. Even on the ones I personally have. A radiator will get gunked up (even with normal coolant changes) before they will start to seep from the...