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Most likely your problem is just the switch itself that controls the speed of the fan or a fuse. These are the easiest and cheapest things to check first. You can get the swithc at a local parts store or from a GM dealer. If that doesn't work check for loose of broken wires. It all that fails replace the blower motor. Check the fuse first.

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โˆ™ 2005-05-20 15:21:05
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Q: On a 1991 GMC Jimmy the ac heater and vents are not working not blowing air is this the blower if so how much does that run and how easy to fix?
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Why will the heater on a GMC Jimmy not work?

Depends on what you mean by heater will not work. If the blower motor will not work, it can be a blown fuse, bad blower motor, bad blower motor switch, or a defective blower motor resistor pack. If you mean that the blower motor works but there is no heat, then it can be a clogged heater core, thermostat stuck open, or defective heater control valve.


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Your system could be low on coolant to flow through the heater core. You may also have a blockage somewhere preventing coolant flow into the heater core. If you can hear your blower motor blowing, perhaps the dash was put back into place incorrectly and the heat is being diverted away from it's intended path.


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I need to know how to replace a heater core in a 1992 GMC Jimmy?


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What can be causing a 99 GMC Jimmy to be blowing hot air all the time after the actuator and the heater control assembly have been changed and the freon is good and the control valve is closing?

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How hard is it to change the heater blower fan in a 1994 GMC Jimmy?

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Your 98 GMC jimmy has started blowing antifreeze fumes fogging the windows AC works fine cant find any leak in the hoses is this a heater core probem if so where is it located?

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Can you assume the blower motor on a 1998 GMC Jimmy is causing you not to have forced air after replacing the blower and AC relays and blower switch?

It can also be a blown fuse, or a defective blower motor resistor pack.


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The Heater core on your 1997 Jimmy is on the passenger side inside the cab, but it is behind the black plastic close the floor, and very difficult to get at.


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A diagram of the heater core of a 2001 GMC Jimmy can be found in the service manual. It outlines the location of all the components and how they are connected.


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What is the cause of 1995 jimmy with no heat coming from main vent Defrost is fine as well as floor heat When turned to cold side air flow increases When turned back to heat air flow subside?

I have the identical problem on a 1991 Jimmy. I have replaced the blower motor and flushed the heater coil. I know the vents are working properly because they work when the temperature is selected to cold. I am wondering if there is something under the hood that redirects the aif flow either through the cooling coil or the heater coil based on the position of the temperature control. If so possibly the heater coil (air side) is clogged. I noticed that the heater coil is below the AC coil so it is possible that debris is down in it. I may try to pull it and clean it. Have you tried that?