don't underestimate taking it apart and cleaning it. the one i had on a 66 froze up. after i took it apart and cleaned and lubed it, no more problems. i think i hooked it up on a bench to a battery and lubed it as it ran. i have had both the thrift and deluxe heaters. i doubt the thrift spins slower since it's the same motor- right? it's kind of neat how the speeds work. a "thermal deal"- can't think of the name under the glove box cuts down power to motor. i have actually bypassed this before when it has went out and just had a one speed fan- high.
