If the A/C in your project Cadillac is having trouble turning on, it could be a faulty relay. This NOS air conditioning relay fits all 1969 and 1970 models except for the Eldorado, all 1971-1976 models, 1977-1978 Seville and Eldorado models, and 1979 Seville models.

Cadillac Model Years

1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979

GM Part Number

1496668