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.
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.
heater core plugged or air locked check to see if hoses going to heater core are hot
Low coolant? Bad thermostat? Heater core plugged, restricted, or airbound? Temperature control cable not working?
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.
On the passenger firewall in the engine compartment beside the heater/ac blower. It is a 1"x1" cube about 2" tall.
heater core is behing the dash on the passengers side and the blower more same side but under the hood up against the fire wall. Its round you cant miss it.
The blower speed resistor is burned out. It is located under the hood, on the firewall, passenger side, not far from the blower motor.
How do you replace the heater core on a jimmy?
The blower motor is located on the passenger side, under the hood, against the fire wall. It is protected by a rubber cover that you need to cut out. Look close it says CUT HERE FOR SERVICE.
Before CHanging the Heater Core, have you tried flushing it? I have a 99' Jimmy and have to do this every year to get my heater to work.
If the blower works on slower speeds only I would suspect the high speed blower motor relay (under the hood in the power distribution box) or the switch itself. The blower speed resistor is working if all the slower speeds work.
Under the hood , in the main fuse box. It should be a relay in the main fuse box , that is located under the hood.
I need to know how to replace a heater core in a 1992 GMC Jimmy?
heater control valve located on 2001 gmc jimmy 4.3l
Remove blower motor 97 GMC jimmy
Make sure the heater control valve is closing. Unfortunately, that can be a difficult process and usually involves disassembling the heater assembly under the dash.
Simple, Passenger side engine caomparment on the fire wall. Remove the cover (its kinda round) remove and bolt in new motor.
were is the heater relay on1996 jimmy?
yes it is. the heater core is located behind the dash on the passengers side. The dash has to be removed
It can also be a blown fuse, or a defective blower motor resistor pack.
Better check your title. Jeep doesn't make the"Jimmy". Jimmy is made by GMC, The blower control module on a GMC Jimmy is located in the heater unit which is a plastic housing located on the left (passenger) side of the firewall. However, Jimmys are noted for bad connections on the module plug , the motor plug, & some have another plug that goes bad regularly to the rear of the left fender well. You would be wise to check those connections before buying parts. Good luck.
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.
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.
hi, i need to know how to replace the heater core with a/c on a 1994 gmc jimmy. a diagram would be helpful
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?