Question about 1999 GMC Jimmy

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1999 jimmy cycles form hot air to cool air constantly

It seems like the flapper is changing postions back and forth

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  • 7 Answers

This sounds like possibly a broken blend door on the heater box assembly or possibly a vacuum problem if the blend door is controlled by vacuum.

Posted on Jun 27, 2009

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Posted on Jan 02, 2017

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Need help.. I have a 2001 Dodge Ram 1/2 ton truck.. heater will not get hot.. changed the thermostat..had the radiator flushed.. checked heater coil (sp).. checked the air conditioner flapper door to see...


1 check,Feel the heater hoses,do they get hot ,both or one?They should be hot,if not flush the heater core directly with a hose,back and forth at each hose connection.
2nd check,clamp off the top rad hose and force the hot water through the heater and check heat output.If there is heat with top rad hose clamped change the thermostat,it's either leaking or defective,new or not.

Jun 01, 2017 | Cars & Trucks

1 Answer

With A/C selected to vents the air cycles between vents and defrost on windsheild.


There is a flapper inside the duct work behind the dash that is getting stuck or has a bad connection. It is cycling back and forth, re-routing the air flow. It is not an easy fix and should be referred to a professional!

Aug 05, 2010 | 2003 Ford Expedition

1 Answer

Heating Unit problem


check the fuse and the wires.

Jun 19, 2010 | 1999 GMC Jimmy

1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

May 07, 2010 | 1999 Ford Expedition

1 Answer

I was towing and the hud said hot transmission fluid bring engine to idle. I pulled over and let the tranny cool but since then the trucks shift pattern has changed. First revs to 5000 rpm before changing...


your transmission oil is likely burnt,there by losing it's viscosity. check for brown rather than red fluid on dipstick.have transmission oil & filter changed.it is possible overheating will have caused additional damage.

Sep 28, 2009 | 1999 GMC Sierra

1 Answer

1997 gmc jimmy sounds like something popping at times right behind dashboard. Air conditioner works well, but cool air comes out when heater is on. Check gauges light came on.


get diagnostic-trouble code will tell you what is happening.

suspect failed relay to close flapper to swtich between heater and AC

Sep 16, 2009 | 1997 GMC Jimmy

1 Answer

Continuous heat coming from vents


You need to have the temperature valve actuator replaced. It's a dealer only part on top of a huge labor fee (about 600). I've been just opening my windows in the winter when it gets too hot... but with spring/summer coming I will have to have it rigged to constantly blowing cool air (and bring a sweater!). Good luck.

Apr 05, 2009 | 1999 GMC Jimmy

2 Answers

Heater goes from hot to cold


I WAS TOLD IN THE PAST TO GET RID OF THE ORANGE ANTIFREEZE AND PUT IN THE GREEN IN ALL MY VEHICLES CREATES MORE PROBLEMS THE IT CURES THIS IS BY A SHOP I TRUST.I HAVE A 95/98 AND 99 BLAZERS.I HAD PROBLEM WITH VERY LITTLE HEAT AFTER CHANGING THERMOSTAT. HAD TO GET AIR OUT OF LINES BUY RUNNING IT FROM COLD START WITH RADIATOR CAP OFF UNTIL THERMOSTAT OPENED AND LEFT IT RUNNING UNTIL I SAW NO AIR BUBBLES COMING OUT OF RADIATOR SEEMED TO CURE PROBLEM

Dec 13, 2008 | 1999 GMC Jimmy

3 Answers

Blend door 1999 jimmy


check the blend door motor under (behind) the glovebox. make sure the ac system is cooling first.

Jul 30, 2008 | 1999 GMC Jimmy

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