Question about 1998 GMC Jimmy

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1998 GMC Jimmy computer climate control issue. There is no HVAC response. No fan, no AC, no rear defrost, and no lights. Any ideas on what to test?

I have a 1998 GMC Jimmy and the AC quit working. There is no response from the blower. I have the computer climate control and there are no lights. Nothing for recirc/AC/or rear defroster. Is there a way to tell if the module is bad?

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Looks like you are not alone in this. Take a look at this video that may help solve your issues. Good luck DIY How to Replace Heater AC Blower Motor on Chevy Blazer GMC Jimmy S10...

Posted on Apr 07, 2015

Testimonial: "I am not sure that it is not the blower. there are no lights on the controller. there is no light on the recirc, a/c, or rear defrost buttons."

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Posted on Jan 02, 2017

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  • 116 Answers

SOURCE: HVAC Blower Motor

do you have the manual.

Posted on Oct 07, 2008

picatudo
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SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

timsauto123
  • 750 Answers

SOURCE: 1998 jimmy....climate control system not

check the blender acuator,sound like it's not moving back and forth.under the dash.











TIM......

Posted on Oct 23, 2010

jsmes1027
  • 749 Answers

SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

Posted on Nov 02, 2010

johnjohn2
  • 5763 Answers

SOURCE: 1995 GMC Yukon has issues

the fan setting sounds like a bad blower resistor or high speed relay but i would say the resistor, the air problem may be related to the controls or vacuum leak. check the engine area around the intake and make sure the vacuum lines are good and there are no leaks as this heater system is vacuum controlled, depending because some are actuator controlled also listen under the dash for a hissing noise as that would be a vacuum leak, another thing is to remove the control and check for vac leaks at controller.

Posted on Feb 05, 2011

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I have a 98 bonneville se. the blower fan only comes on when the knob is all the way up and it ONLY blows heat and absolutely no cold also the air only blows out the defroster and the floor


How did you test the A/C system ? Hook up gauge manifold , test A/C pressures ? Manual or automatic climate control ? The blower motor only working on high means the blower motor resistor is bad ! Did you hook up a scan tool an check high an low pressure switchs inputs to the PCM - engine computer . Does the A/C compressor clutch engage ? turning on the compressor ? Moving the mode switch does nothing . Doesn't move from floor to vent to defrost ? Probably the mode door actuator ! Don't think the HVAC control panel is bad . Just a few little things . Pushing the A/C button on the control panel just send a electrical signal to the PCM , the PCM will energize the A/C clutch relay , turning on the compressor .

The Trainer 40 When the compressor won compress

Blower Motor Problems Auto Repair Help

Do you know how to test automotive electrical circuits ?

Heater Blower Motor Troubleshooting


May 19, 2017 | 1998 Pontiac Bonneville

1 Answer

CLIMATE CONTROLLS NOT WORKING


Check the AC compressor to see if it is turning on, if it isn't the system is likely low on charge due to a refrigerant leak. You must have the leak repaired before adding any $10.00 per can R134, otherwise you might as well just flush the money down the John. Do not replace any parts until the problems have been diagnosed by a HVAC qualified tech,.

Jul 05, 2012 | 1998 GMC Jimmy

1 Answer

Heat blows out at floor only and ac does not come on even though light Indicates it's on. Has rear defrost and light works..Also has recirculating air button . I'm guessing the whole heating control in...


I would first remove the fuse for the heater control head for one minute and then put in and retry.
The control head could have locked up on you with a volt spike. The rear defrost switch does not go through the same circuit in the heat as the hvac controls. Could be a broken know also.
Could also be mechanical linkage on side of heater box above accelerator pedal may have broken or popped apart. or if electrical motor control may be actuator.

#76-11-01: HVAC CONTROL KNOB SPINS FREELY (REPLACE) - (Oct 9, 1997) 999999995.gif SUBJECT: HVAC CONTROL KNOB SPINS FREELY (REPLACE ALL THREE KNOBS)
MODELS: 1996-97 CHEVROLET AND GMC M/L AND G VANS 1995-97 CHEVROLET AND GMC C/K TRUCKS
CONDITION:
SOME CUSTOMERS MAY REPORT THAT ONE OR MORE HVAC CONTROL KNOBS SPIN FREELY, RESULTING IN LOSS OF FAN, TEMPERATURE AND/OR MODE OPERATION.
CAUSE:
THE KNOB'S PLASTIC INNER SHAFT MAY CRACK WHEN FORCED AGAINST ITS STOP.
CORRECTION:
IF ANY ONE OF THE THREE HVAC CONTROL KNOBS EXHIBITS THIS CONDITION, REPLACE ALL THREE KNOBS WITH NEW P/N 16268157.
PARTS INFORMATION:
P/N DESCRIPTION QTY 16268157 KNOB, HVAC CONTROL 3

Sep 27, 2010 | 1995 GMC Yukon

1 Answer

2006 slt gmc envoy ac problems vent controls anbd


{: ) The popping sound you heard is caused by the sudden movement of an HVAC door, most probably coming from the recirculation door actuator (right dashboard area) or the mode actuator( mid dashboard area). The fan outputs could be normally working, but is being muffled by the incorrect positioning of the HVAC doors, giving an impression that there is fault in the blower controls. In other words, your vehicle is having an air distribution issue.
If there's no conflict in your climate settings, then the trouble may be in the HVAC doors binding or broken, or the actuators faulty or sticking. In both cases, servicing may involve removal of the dashboard to access these HVAC components.

Jul 20, 2010 | 2006 GMC Envoy

1 Answer

I have a 1998 GMC Jimmy, I have a service engine soon light, and I have be having problems with the climate control (no matter where I put the the dial tempture wise it goes from hot to cold AC on or off....


have the vehicle scanned for trouble codes most auto stores such as auto zone/advanced auto do it for free/ur heat and engine light might be connected the control panel uses cable--elect and vacuum connections to move and actuate dampers and switching between hot and ac

Oct 19, 2009 | 1998 GMC Jimmy

1 Answer

98 Jimmy Blend door cycling


I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?

Mar 21, 2009 | 1998 GMC Jimmy

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