Check the hoses for splits
The easiest thing to do is get it pressure tested. That will show the leak right away. If not make sure that you check the area of the water pump, when they go bad, the bushing starts to wear and there is a WEEP hole that drips.
SOURCE: No heat at all coming out of the heater!!
these trucks are famous for plugged heatercores,what you do is,remove both hoses to heatercore at firewall, mark there location, next cut two peices of heater hose, about 12 inches long, slide on the heatercore where the hoses where, then use a water hose and flush in both directions a few times, then you should have heat, also if its been a while i would also have the cooling system flushed out, hope this helps. good luck.
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SOURCE: 1989 Chevy Suburban keeps overheating...have
try to see if ur heater core is pluged up sumtimes that can cause ur car to over heat. hope this helps
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SOURCE: the truck is overheaing, the serpentine belt is
could be thermostat but also could be clutch fan,or a bad head gasket.
SOURCE: help needed to figure out why truck says it over heating
you might want to check the wires going to the temperature sensor on the engine make sure it hasnt rubbed the protective coating off, this can give you a false reading, the safest way is to put a manual gauge in place of the temperature sensor and run engine to make sure the engine is not overheating. You can pick up a cheap manual temp gauge at your local parts store and install the temperature probe into the hole where the temp sensor was located and run the engine. It sounds like you have a guage malfunction. But is better to be safe than sorry.
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