<VV> Blower Relay

[BobHelt at aol.com]

In a message dated 10/24/2010 5:34:51 A.M. US Mountain Standard Time,  
carlton55 at comcast.net writes:

Well I  have a question here. I bought one of these new blowers from
Clark's at the  Corsa Convention. Before I installed it I emailed
Clark's. I specifically  asked about the need for a relay to be added
because of reports from the  Corsa tech guide, The Helt books and members
on this list that the relay  was necessary to keep from burning up the
heater control switch. The answer  back to me "in writing" was that a
relay is NOT necessary and that they  have never received a complaint
from any customers.

So what gives  here?



Hi Carlton,
Think of it this way. 
 
Chevrolet engineering designed the heater blower circuitry to handle the  
voltage and current of the STOCK blower motor. The design was for the stock  
setup. 
 
Now a new motor designed to blow more air is going to require more current. 
 There is no free lunch. More airflow means more power that means either a 
higher  voltage or more current. The voltage is the same so  that means more 
 current. You can't get away from that.
 
So the question boils down to whether the old stock switch will handle the  
increased current that it is NOT designed for. If you think yes, then what 
is  your logic and basis for this conclusion?
 
If you think NO, then put in the relay.
 
Regards,
Bob Helt