Having problems with your 1996 GMC Jimmy ?

Do you have to remove whole dashboard on 96 gmc jimmy to remove and replace heater core?or can you do everything from underneath the glove box?

Posted / edited by AnonymousUser on : 11-12-2017

Answers :

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  1. Remove the front dash panel by turning the lower screws in a\015\012counter-clockwise direction, then unscrewing the single bolt on the lip\015\012of the instrument cluster and pulling the panel out. Remove the rear\015\012wiper switch and the 4x4 switches, if applicable. Lowering the tilt\015\012wheel will allow the panel to be totally removed.
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  3. Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
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  5. Remove the main dashboard by unbolting it at the front, between the\015\012windshield and firewall. There are six to eight bolts holding it in,\015\012and, once they are removed, the dash can be pulled away from the\015\012firewall. Be careful not to pull too much, as the wiring harness could\015\012become damaged.
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  7. Drain the coolant system by turning the drain plug on the lower left\015\012corner of the radiator and allowing the fluid to fall into the drain\015\012pan. Uncapping the radiator can reduce the internal pressure.
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  9. Remove the heater core hoses,\015\012on the upper left of the engine bay, by pinching their hose clamps with\015\012a pair of pliers and pulling them off. Some models will have screw-type\015\012hose clamps; turning them counter-clockwise will loosen them. Age and\015\012heat may have stuck the hoses to the core nipples, and the hoses can be\015\012cut right at these nipples if necessary. Leave enough hose to reconnect\015\012the new core.
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  11. Unbolt the heater core's mounts with a socket wrench in a\015\012counter-clockwise direction. Once the bolts are free, the heater core\015\012can be maneuvered toward the windshield and slid out. Some coolant may\015\012splash out, so have a towel handy.
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  13. Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
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  15. Reconnect the heater core's hoses, turn the radiator's drain plug\015\012clockwise to close it, then refill the coolant system with a 50/50\015\012percent mix of coolant and water.
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  17. Reconnect the dashboard to the firewall, then replace the front dash\015\012panel and fasten its instrument cluster screw and bottom bolts.
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  19. Crank up the truck and add coolant until the heater core is filled and blowing hot air.
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  21. Replace the radiator cap.
The Jimmy uses a coolant-heated radiator core mounted in the dashboard to\015\012provide heated air into the passenger compartment. This heater core can\015\012become clogged and leak, as it is usually the lowest point in the\015\012coolant system and debris settles into it. Replacement of the heater\015\012core will take the average of about two hours to\015\012complete. Good luck
I just replaced the heater core and put everything back together .the ac works fine. the heater works fine on vent position. but when i put it on the heat position white smoke starts rising from the switch area .the blower also works fine .
\015\012any clue ?
Repair Help & Product Troubleshooting for 1996 GMC Jimmy

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