1964- 1967 heater fan

[John M.]

Are 1964- 1967 Corvette heater fans the same part number as passenger cars....Thanks in advance John Meissinger

[Joe L.]

Re: 1964- 1967 heater fan

John-----

1963 to 1966 Corvette heater blower fans were the same as those used for 59-66 passenger cars and light trucks. All were GM #3144683.

For 1967 Corvette and 1967 passenger cars and light trucks the part number changed to GM #3905776 and this part continued to be used for both through the 1971 model year.

The GM #3905776 will SERVICE 63-66 model Corvettes, however. So, we know there is "rearward" compatibility of the 3905776 with the 3144683. However, I don't know if there is "forward" compatibility of the 3144683 with applications originally using the 3905776. I strongly suspect there is, though.

[Joe L.]

Correction

John------

I erred on the part number for the 63-66 heater blower fan. The part number for the 63-66 fan assembly was GM #3144684 and NOT GM #3144683. That's a significant error since there once was a blower fan of GM #3144683. However, it was never used on a Corvette. The GM #3905776 replaced the 3144684 for SERVICE.

[Wayne M.]

I concur -- 2 questions

Joe, when checking an Oct 1967 P & A 30, I see that the "684" specifies for clock-wise rotation and the "683" for counter c-w.

What is the GM convention for rotation datums ? ie. engine-trans rotates counter c-w when viewed from the driver seat. Distributor rotates clock-wise when viewed from above.

When did the "bird-cage" fan assy's go from steel to plastic ?

[Joe L.]

Re: I concur -- 2 questions

Wayne------

In the case of the blower motors, the direction of rotation is as viewed looking at the shaft or fan.

I'm not sure exactly when the fan changed from metal to plastic. However, I think it was the change that occurred effective with the 1967 model year and the intoduction of the 3905776 fan assembly. The 3905776 fan is plastic and I think that the earlier fans were metal.