1998 GMC Jimmy "blend door" Questions

...blend door keeps cycling from hot to cold no matter what setting it is on. Went to auto wreakers and tried a new control switch assembly no luck. please help if the blend air door keeps cycling even ...

...blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut here for service" under the hood along the firewall. I ...

...blend door. Any help fixing this problem? I fixed the problem. It was the blend door actuator, but the wheels continued to turn because the reset operation requires resistance to know when the blend ...

...Blend door cycling 98 Jimmy with climate control. Heater started blowing hot air then cold air then hot then cold etc. With vehicle not running and with key in the on position, you can hear the blend ...

...a blend door problem.The system is designed to default to the defrost position for safety.If the blend doors are vac operated, look for a vac leak.If electric, look for a failed motor or stuck

blend door on my 1999 GMC Jimmy ....replaced thermostat.....flushed system and replaced cracked radiator....heater coil is not leaking. A/C is a seperate unit, has its own switch and indicator light..

...like the flapper is changing postions back and forth This sounds like possibly a broken blend door on the heater box assembly or possibly a vacuum problem if the blend door is controlled by

blend door 1999 jimmy blows hot air check the blend door motor under (behind) the glovebox. make sure the ac system is cooling first. friend fixed it, i took it apart and there was a crack in the main

...blend door control gives out and needs replaced. Here is the website for Advanced Auto and what you need. ...

...blend door switch were the fan switch is if so replace for sure.this assembly comes as a unit a very common problem .the dealer will have it in stock . hope this has helped if it wors in other modes ...