Question about 1991 GMC Sonoma
It sounds like the coolant is not circulating through the heater radiator. You may have a blocked heater hose but I suspect that the control wire/cable that goes from the heater control lever has broken or become disconnected from the heater tap that controls the volume of hot water through the heater radiator. Some times there is also a flap in the air ducts that is operated by the heater lever that varies the amount of air that is heated. The tap is usually in the engine bay or may be tucked in behind the air ducting. On some models the controls are operated by very small vacuum lines and the rubber hoses can become hard and not seal fully on the the pipes. If this is the case, check the places where the hoses connect to the control or the actuators.
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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