Question about 1997 GMC Jimmy

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Air and heat only blowing out through defrost and floor vents in my 1997 Jimmy. When switch is turned to the main vents nothing changes. Where is the auctuator loocated theat changes airflow?

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Sounds like you may have a vacume problem in the dash.

Posted on Mar 13, 2011

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My a/c will only blow out the defrost in a 97 gmc jimmy


It is either the servo door could be blocked by something like a pencil falling through or something falling and blocking it from opening. Or it is actually broken. I have seen them both ways. Mine was actually broken in my Ford F250. You should still take it in to someone who can deal with it for you.

Apr 09, 2012 | 1997 GMC Jimmy

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The air blows but it don't heat like it suppose to nor do it allows the defroster to work. it a 2000 gmc jimmy 4-wheel drive someone says it may be the heating core


Sounds like a vacuum activated switch. Your engine vacuum is used to open and close little doors in your vents. If a hose is loose or disconnected or the electronic controls that tell the switch to let vacuum thru is not working, no air will reach your defroster vent at the windshield. Does the switch that controls Vent, Heat (sends to the floor), AC and MAX AC do anything at all? If they do, you may have a specific switch problem. If you switch from Vent to MAX AC the sound of the air flow should be much louder. If the switch isnt changing where the air blows, it is leading you to the problem. Either the switch is bad or the supply of vacuum to the switch is not there whether it is a loose vacuum hose or a disconnected one. Happens often when aftermarket stereos are installed and the installer disconnects something either by accident or forgets to reconnect it.

Apr 09, 2010 | 2000 GMC Jimmy

2 Answers

98 Jimmy throws out heat but won't switch to all vent options


Your going to have to replace the switch. The switch it self may have gone bad, since it works on a vacuum. It's common for the diaphragm in the switch assembly to go bad, if it's not the switch. Then it's going to be a bad actuator door and will need to be freed up. I have found it to be the switch it self get dirty and the vacuum needed to activate the actuator door is not there.

Good luck and keep me posted. When you turn the switch from defrost to heater, do you hear a air leak??? If you do then it's a good chance that it's the switch it self.

Dec 03, 2009 | 1998 GMC Jimmy

1 Answer

A/C blows from defrost and floor vents, nothing from dash vents.


the switch where you turn it to blowing at your head is probably out. you will need to replace the switch control where your defrost, foot, head etc. what make, model, year is your vehicle?

Jul 09, 2009 | 1994 Toyota Camry

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Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

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