99 jimmy no heat,new heater core,themostat and radiator replaced dash temp controll also,have br bl and blue wires in plug behind glove box .goes to nothing.wheres the blend dr accuator located ? discription of it.wheres the blend door located.tried everything heater hoses both hot but no heat help please

SOURCE: 1998 Jimmy SLT heater problem

if the blend air door keeps cycling even if the setting is hot or cold this tells you that the thermostatic control sensor is bad. replace that and the problem will be solved.......please rate this.

SOURCE: No Heat for 2001 Chevy Blazer

All I did with my 1999 blazer is pull the a/c fuses from under the hood and heat blows just fine.
good luck

SOURCE: 2002 jeep grand cherokee heater doesn't blow hot

If ythe heater core is not bad then I would replace the thermostat, this will stop the warm coolant running up to your engine go to the heater core.

Marvin

• 85242 Answers
• Posted on Jun 18, 2009

SOURCE: MY TEMP BLEND MODUAL IS BAD WHERE IS IT LOCATED IN THE DASH OF A

the part u are referring to is the temperature control blend door actuator motor, it is about center of air ducting, in order to access the part u must remove the entire dash assembly, not a job for a DIYer, 12-15 hour job.

Harvey N Tawatao

• 3854 Answers
• Posted on Nov 19, 2009

SOURCE: do you have to remove whole dashboard on 96 gmc

1. Remove the front dash panel by turning the lower screws in a counter-clockwise direction, then unscrewing the single bolt on the lip of the instrument cluster and pulling the panel out. Remove the rear wiper switch and the 4x4 switches, if applicable. Lowering the tilt wheel will allow the panel to be totally removed.
2. Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
3. Remove the main dashboard by unbolting it at the front, between the windshield and firewall. There are six to eight bolts holding it in, and, once they are removed, the dash can be pulled away from the firewall. Be careful not to pull too much, as the wiring harness could become damaged.
4. Drain the coolant system by turning the drain plug on the lower left corner of the radiator and allowing the fluid to fall into the drain pan. Uncapping the radiator can reduce the internal pressure.
5. Remove the heater core hoses, on the upper left of the engine bay, by pinching their hose clamps with a pair of pliers and pulling them off. Some models will have screw-type hose clamps; turning them counter-clockwise will loosen them. Age and heat may have stuck the hoses to the core nipples, and the hoses can be cut right at these nipples if necessary. Leave enough hose to reconnect the new core.
6. Unbolt the heater core's mounts with a socket wrench in a counter-clockwise direction. Once the bolts are free, the heater core can be maneuvered toward the windshield and slid out. Some coolant may splash out, so have a towel handy.
7. Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
8. Reconnect the heater core's hoses, turn the radiator's drain plug clockwise to close it, then refill the coolant system with a 50/50 percent mix of coolant and water.
9. Reconnect the dashboard to the firewall, then replace the front dash panel and fasten its instrument cluster screw and bottom bolts.
10. Crank up the truck and add coolant until the heater core is filled and blowing hot air.
11. Replace the radiator cap.