Auto Air Conditioning & Heater Repair: heater, isuzu hombre, air conditioner

Question
1999 Isuzu Hombre Pick-up truck
When I turned on the heater the other day, even after running for 20+ minutes, the air coming out was cold. The air conditioner has worked fine, and the fan is functional. What may be the problem with the heater, and how much money might it take to repair the problem?

Thank you.

Answer
What was the LAST repair on the vehicle ?. ANY repair of any nature ?. In most cases problems that arise days, weeks or even months later can usually be traced back to the previous repair.

Are BOTH heater hoses HOT to the touch where they pass thru the firewall when the engine is fully warmed up ?.

Has the thermostat ever been replaced ?.

Has the vehicle EVER over heated ?.

I need answers.


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