I have a 1998 Plymouth Voyager that my wife and daughter usually drive. Last week they told me that the heater blower only worked on high and had been that way for a while. So ... replaced the blower resistor .. no problem, wires were in good shape so did not have to touch those. NOW ... the blower runs constantly at one reduced speed except when at the high setting. The blower will not turn off at all. Is this a blower relay problem? (I tapped on the relay but with no success). It seems strange that this problem would happen in parallel with the resistor problem but I can't see how they are connected. Thanks for any advice.