Question about 1999 GMC Suburban

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Water or antifreeze leaking from a different area other than the radiator. replaced the radiator and thermostat.

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  • Contributor
  • 34 Answers

Check the hoses for splits

Posted on Oct 21, 2013

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  • GMC Master
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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.

Posted on Oct 21, 2013

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Posted on Jan 02, 2017

johnjohn2
  • 5763 Answers

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.

Posted on May 04, 2010

Testimonial: "Thank you...it worked like a charm!!!"

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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

Posted on Jul 02, 2010

Testimonial: "Never thought of core being plugged...Thank you"

  • 844 Answers

SOURCE: the truck is overheaing, the serpentine belt is

could be thermostat but also could be clutch fan,or a bad head gasket.

Posted on Jan 22, 2011

  • 71 Answers

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.

Posted on Nov 21, 2011

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My car overheats very easy.i can drive 1 exit on the highway and the temp goes up very fast. i dont know what it could be. there is always fluid in the reserve area and doesnt seem to be getting low or im...


COULD BE THERMOSTAT IF TOP RADIATOR HOSE IS NOT HOT AND BOTTOM RADIATOR HOSE GOING TO WATER PUMP IS HOT THE THERMOSTAT STICKING PARTIALLY CLOSE.IF TOP HOSE IS HOT THE RADIATOR,ENGINE BLOCK HEATER CORE NEED FLUSHING OUT.IF WATER PUMP WEEP HOLE LEAKING REPLACE WATER PUMP, FAULTY WATER PUMP WILL CAUSE ENGINE TO OVER HEAT.REPLACE RADIATOR CAP MAKE SURE YOU HAVE 50 / 50 MIX SOLUTION ANTIFREEZE AND WATER IN COOLANT SYSTEM. IF ALL LOOKS GOOD CHECK ENGINE OIL ON DIP STICK, IF OIL IN DIP STICK LOOK LIKE MILKSHAKE YOU HAVE BLOWED HEAD GASKET THAT WILL CAUSE ENGINE OVERHEATING WHILE DRIVING CAR IN SHORT DISTANCE AND ENGINE OVERHEATING.

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