Question about 1999 GMC Jimmy

1 Answer

A/C button produces heat and heat button produces cold air

This summer we had no problem with the A/C, since the cold weather if I put the heat to the max on any position it produces cold air but if I put it on A/C the air is kinda warm. Is there something I can do to fix that problem?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 46 Answers

Sounds like the blend door in the HVAC unit is malfunctioning. there is a servo motor that switches a door from the cold side to the heater core side for hot air. sounds like thats what it is. hope this is helpfull

Posted on Jan 17, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Fan works but no heat?


Check coolant level,could be a bad thermostat,air lock.

Oct 14, 2016 | 2009 Nissan Murano LE

1 Answer

Heat doesnt work in my jeep cherokee when driving but when sitting heat works


Put a piece of cardboard in front of the radiator. Only if it's cold out though, Usually in really cold weather, the cooling affect of the cold air circulating around the radiator keeps the fluid from getting hot enough to produce heat unless your running in park.

Dec 17, 2013 | 1998 Jeep Grand Cherokee

1 Answer

Heater taking long time to produce any heat.


Bad news ,nothiong worse than a cold car so iam assuming this is a 16v job and the thermostat is behind the timing belt which is a summers day type job ,so as a temporary fix put a sheet of cardboard in front of the rad till the weather warms up this will make the engine run hotter and the cars internel heater radiator will be all the cooling it needs in the cold weather

Nov 19, 2013 | Cars & Trucks

1 Answer

My 2001 mustang wont start in cold weather


sounds 2 things here. fuel pressure regulator or the idle air control valve. I an goingwith idle air control valve

Nov 12, 2012 | 2001 Ford Mustang

1 Answer

The heater in a 1996 cadillac fleetwood does not blow hot air when engine is idling, it is just warm, when the weather is very cold, (below 25 degrees.) when it is not this cold it seems to work...


I am guessing you have not changed your thermostat from a summer one to a winter one. If this is the case you need to put a 195 degree thermostat in to replace the 165 degree summer one. Let me know. Thanks.

Jan 22, 2011 | 1996 Cadillac Fleetwood

2 Answers

2007 Chevy Silverado dual climate control, even if passenger side is not on it blows cold air on passenger side and hot on driver side when in heat mode, also noticed cold air on driver side when A/C is on...


Just had this happen today to my 2007 silverado heat on the right side cold air on the left side. After engine was off 15 minutes and restarted heat was on both sides. I'm guessing a relay failed to open door to allow the heat to flow thus blowing cold air.will monitor diligently for a while.

Oct 20, 2010 | 2007 Chevrolet Silverado Classic SS New...

1 Answer

How to troubleshoot the electrical air conditioning system 2000 GMC Yukon Denali. I put in new resistor, relay and dealer blower motor and it still doesn't do anything. Air conditioning control switch...


The compressor on the air conditioner in my 2000 GMC Yukon XL went out last summer. Had it and the whole line replaced at a local air conditioning shop last fall. Used it little before cold weather. Warm weather this spring and no cold air. We could hear the compressor trying to kick in. The shop told us that the control console was bad and had to be replaced. They told us the part was on back order and did not know if they would be abel to get one any time soon. We took the Yukon into the local GM dealership. They told us that the high side fitting was bad and that the freon was very low and that they would have to deal with that first to check the system. Called back to the air conditioning shop and they said they had a console come in and they would put it in and check the high side fitting. I now have cold air and questions. Bought Yukon in 2005 used, had always had problem of not switching to cold air once the heater has been used. We were told changing the console should fix that. It has not changed. I feel like the console angle was a scam, that the system was just low on freon. Each shop was blaming the other for trying to scam me. And what can fix the heat to cold issue? If anyone has answers I would sure appreciate the knowledge.

Jul 02, 2010 | 2000 GMC Yukon Denali

1 Answer

Clutch slips in hot weather


You might want to flush and re-fill slave cylinder and bleed the system.Use only the recomended fluid,sounds like either air in system or too light weight fluid in cylinder.when hyd. fluid gets hot it get thin when its cold it stays thicker.Is there a heat sheild missing? Hope this helps.

Jun 29, 2010 | 1988 Isuzu Spacecab

2 Answers

94 Grand AM NO HEAT, just blows cold air


your description ends. what have you put in...
if you have put stop leak in the car it can clog your heater core.
check your thermostat
check your engine oil if it looks milky you have a head gasket problem aslo check your coolant if there is oil in your coolant you have a head gasket problem

Feb 04, 2009 | 1994 Pontiac Grand Am

1 Answer

MY suspension will not go up but i do hear the compresser come o


we had this problem in our shop the other day and there was water in the air lines so we put air line deicer in the lines when the truck was warm in the shop and cycled the suppension twice with a jack. you can find deicer in many truck stops and auto pat stores that sell truck parts
later
paul

Dec 24, 2008 | 2003 Lincoln Navigator

Not finding what you are looking for?
1999 GMC Jimmy Logo

Related Topics:

120 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...