No leaking, new thermostat, hoses seem full of hot water, just does not get warm inside truck??help"
You may have a clogged heater core or heater core bypass valve may be stuck closed. bypass valve is usually on the firewall on one of the heater core hoses. if valve seems to be operating properly. you will need to let the vehicle cool down. disconnect both heater hoses. connect garden hose to one side of heater core let water run through one side and then the other side. if the heater core is too clogged it may need to be replaced.
SOURCE: 93 gmc sierra heater not working
THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER
SOURCE: 1998 Dodge Durango no heat when using heater.
BLEND DOOR STUCK OR BROKEN. NEEDS TO REMOVE DASH AND HEATER/EVAP CORE BOS TO REPAIR REPLACE.
SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine
check you antifreeze level and make sure its full
SOURCE: 99 gmc sonoma heater only blows cold air.The inside gage reads150
Odds are your heater core isn't working or plugged. Check your passenger floorboard for water, and replace the heater core. If that doesn't fix it, get a coolant system flush.
SOURCE: My 2000 GMC Jimmy has been blowing cold air. We
airjoc does not have a clue to your problem, I take you want to have warmer air not cooler ac. check the control system, if you have a vacum system tou may have a leak, if it is controlled by voltage, check the control panel and the control box. Also open the hood, place the heater on high but not on any defrost setting preferrably on just the floor setting. Start the engine and see if the ac compressor is running. If it is, the control panel is bad.
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