Question about 1999 GMC Jimmy

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I am having problems with my GMC jimmy 1999. i recently change the heater core, water pump, thermostat and now i am having a leak towards the back of the engine. the major part of the leak hit's the starter. does any one know where is the leak coming from? or have any information? thank you!!

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  • 59 Answers

Check all your hoses/connections for leaks including the hose that is connected to your heater core at the firewall.

Posted on Oct 19, 2010

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3 Answers

Hi, heater fan is blowing cold air and sometimes warm air depending on when i start the engine.


could be your heater core or thermostat ,check to see if your water pump has a leak

Jan 27, 2011 | 2000 GMC Jimmy

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We live in a cold climate. Our 1998 GMC Jimmy Heater will not provide cabin heat. The engine warms normally. We replaced the thermostat just to make sure the coolant was warm enough. The blower operates...


UNHOOK BOTH HEATER HOSES AND FLUSH OUT HEATER CORE
DO IT FOWARD AND BACK FLUSH / COVER DIST. CAP OR YOU WILL
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BLEED AIR OUT OF SYSTEM / IF IT DOES'T CLEAR OUT HEATER CORE
WILL NEED TO BE REPLACED (DASH COMES OUT TO DO HEATER CORE)

Dec 08, 2010 | 1998 GMC Jimmy

1 Answer

Is over heating i change the thermostat n the hoses and the raidiater is not leaking


heater core may be clogged up or your water pump is not workin

Dec 06, 2010 | 1999 GMC Jimmy

2 Answers

My van still shows sign off over heating according to my thermostat but recently replaced water pump and radiator


the 4.3 engine has a problem with leaking intake manifold gaskets. check for leakage behind the water pump. did you change the thermostat? This controls the engine temp. check for rusty radiator cap and replace if worn

Nov 06, 2010 | 1999 Chevrolet Astro

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We just bought a 1999 GMC Jimmy and the heater doesn't work. The fan blows but there is no heat. The air conditioner works fine.


Could be that the heater core is disconnected, there are two hoses that attach to the heather core that come out of the engine, this provides hot water to the core thus making the heater work, when the heater core starts leaking water the quick and fast fix would be to bypass the heater core and connect the two hoses together, check under the hood on the left passenger side there should be two hoses about 1" thick see if there are connected together or of they seem to be connected to 2 outlets that come out of the inside of the vehicle. people do that specially if selling vehicle.

Sep 06, 2010 | 1999 GMC Jimmy

1 Answer

2001 jimmy overheating


I would have your head gaskets checked for leaks into cooling system and if ok try changing your water pump.

Mar 29, 2009 | 2001 GMC Jimmy

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The heater still won't work after I changed the thermostat on my


Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

Feb 12, 2009 | 1999 GMC Sonoma

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2000 GMC Heater Problem


I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.

Nov 19, 2008 | 2000 GMC Jimmy

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