Question about 2001 GMC Jimmy

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2001 gmc jimmy engine warm but heater blows cold air

2001 gmc jimmy heater problems

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Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.

Posted on Dec 12, 2008

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3 Answers

My 2000 jimmy has heat problems. the heat goes from cold to hot to warm to cold etc. what could the problem be?


If the temp gauge is now more stable, the problem is in your heater system, not the engine cooling system.

Sep 12, 2014 | 2000 GMC Jimmy

1 Answer

Air conditioner isn't blowing out cold air


might need to be recharged and might have a leak in the system. take it and get it checked

Mar 16, 2013 | 2001 GMC Jimmy

1 Answer

My 2000 gmc jimmy blow cold air heater


common for this vehicle to have clogged heater core

Dec 16, 2012 | 2000 GMC Jimmy

2 Answers

I have a 2001 GMC Safari van V6 4.3L. The van will RUN at normal temperature and blow warm air but when you come to a stop it blows cold air. What can you tell me about this problem. Changed thermostat and...


Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket. Please let me know the outcome, as we are getting a lot of these cases and are trying to improve the answers.

Dec 14, 2010 | 2001 GMC Safari

2 Answers

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
FILL IT WITH WATER / IF IT CLEARS OUT HOOK HOSES BACK UP AND
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

Heater isn't working (blowing cold air)....and it's overheating as well. Tried flushing heater core but that didn't help. Truck is running rough too. Any ideas as to what the problem might be?


check for a thermostat that is stuck open and will not let the block warm up when running,if it can't warm up to operational temperatures,it will tell the computer to keep the fuel/air mixture rich and this will will make it run rough, like having the choke on partway in an engine with a carburetor controlled engine

Feb 07, 2010 | 1999 GMC Jimmy

4 Answers

My 2001 GMC Jimmy is not blowing warm/hot air. The temperature is slightly elevated but not overheating. When going uphill sometimes will blow warm air but for short period of time. Coolant levels are...


Let the vehicle warm up to normal operating temprature, touch the heater hoses going into the firewall to the heater core, they should both be hot, if only one is hot the heater core is stopped up. If this is the case you will want to try flushing it before you replace it. If you have to replace it be prepaired to spend $400.00 or more depending on shop rates. NOTE: BE CAREFULL WHEN CHECKING HEATER HOSES YOU COULD GET BURNED! Thanks and good luck with your repair.

Nov 06, 2009 | 2001 GMC Jimmy

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