I have noticed recently a blast of cold air blowing from behind my heater box into my passenger side floor. But it blows semi-warm air out all vents but there seem to be some lack of force behind it. I have no clue whats is wrong???. My uncle suggested the blower was running backwards, But I havent touched anything or messed with it in over a year when I changed the heater core...LOL. Any suggestions??????? It's an 89 LX
Any chance you hooked the blower motor backwards when you did the heater core or was it working fine after the swap and suddenly get weak? Any leaks around the blower motor box? Try and get more detailed information about what's happening with the switches in their different positions and see what's changing.
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