Blower on my heater works only when engine is sufficiently warm. on 2004 Mitsubishi Endeavor

I have heard that using a block warmer will cure this. But there is no block warmer on the Endeavor. What is the cause of the issue?

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
I am having same problem and waiting to see what answers you get.