Noticed something weird

[kjohnson]

Here lately I've noticed when my car idles that make heater fan slows down. As soon as it's above fifteen hundred rpms it goes right back to normal. Is this something I should be worried about?

 

[matt5112]

is this when your rear window heater is on?

If so, thats because the voltage is dropping.

 

[TheOtherNick]

Its cold battery is lower charged than normal, heat window heater is on, heated seat is one, blower on high, radio on. Alternator is pissed.

 

[kjohnson]

Yeah guess I neer thought of just a heavy load. It's probably nothing and I'm probably a dumb ass but I figured I'd ask. Does that window heater really pull that much juice?

 

[RyanL]

yes it does keep your blower on low with radio off and push the button you should see the rpms jump just a tiny little bit.