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how can i fix my 2000 GMC jimmy?

My heater is not blowing hot air./ "It blows warmer then what the A/c blows but it is definantly not hot enough for what a heater should be. We have checked the fusses and dont think that is the problem. We were just looking for some suggestions and what maybe it might cost thanks for the help.
rachael vaughan, October 2006
Look under the hood at the firwall on passengers side and there are 2 heater hoses .......with heater on and car at operating temp make sure both hoses are hot if not you proably have a heater core clogged up ....if ok make sure coolant is topped off ...if ok its the controls on the dash or a bad heater control vavle

bg, October 2006