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Got a 98 Blazer and the heater doesn't work, blows cold air all the time. I've searched the this thread and another person had this problem but the answer given is not one for a 98. This an all electric climate control system, with the exception of the vacuum run vent control. Now I've check the cold/ heat switch and it's working fine. I'm thinking that it maybe the temp control motor. Any one have any ideas?

BTW Great site.
 

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The only thing I found in the repair manual pertaning to that system, was that it is complex and needed to be worked on by the dealer.
 
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