Power loss

Hey peeps well after having some issues before with power doing a service and red x helped a bit .... Today I find my car working good when the blowers are off but when I need to demist or warm up blowers on the power goes !! How can blowers affect the engine ? Help ?
 
It puts load on the alternator. This has a parasitic loss effect. It shouldn't be really noticeable though. Maybe your alternator is quite stiff to begin with so extra load shows up more.
 
Yeah as Smith said it draws power from the alternator, so it could be that giving you the issues.
If you turn everything electrical on (lights, blower, hazards etc) and then get a multimeter and see what you are getting across the battery it will tell you if the alternator can't keep up with it anymore. I think you are supposed to get 14.4V from the alternator, but don't quote me on that!
 
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