My 2001 chevy suburban 1500 will not blow heat from the front unit will blow col on 2001 Chevrolet Suburban 1500

air back unit will blow heat

1 answer 1 comment
maybe the blend door is broken
Mine is doing this now. They are telling me 1st to get a flush, and have it cleaned. told it's a 50/50 chance that will solve it. won't even tell you the cost! [coolant to refill is @$32.00/gal], then if this doesn't work...told it's the heater core.