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89 DX Heater blower speed

PostPosted: Mon Nov 04, 2019 6:54 pm
by Yochanan
I have an 89 CRX DX.
I replaced the heater fan, resistor and it works great on all four speeds but it does something strange.
About 6 seconds after starting the car the blower speed drops back a little, like the voltage is programmed to drop shortly after engine start.

Any ideas as to what causes this? I can turn the car off and then retstart it with the exact same blower response. About 6 seconds of the engine running and the blower speed drops somewhat.