1999 Chevy Suburban RKE Problem

My 99 chevy Suburban has a factory installed rke. Started with on hot days not unlocking the driver door, cool or cold days the door would unlock. Over time the problem has gotten worse and now driver door does not unlock at all. Now the problem is spreading the front passanger is not working anymore and at times the driver rear door is not unlocking. Have no idea where to start looking for solution. Any help will be great.

Mike  

GM trucks/SUVs have had problems with door actuators for quite some time now.

Verify the door lock switch does not work the actuators on hot days when the actuators stop working.

If the above is true then your factory actuators are most likely going to need to be replaced.  I have alot of customers who own GM trucks/SUVs that have problems with their factory actuators progressively stop working.  In my own 2000 Chevy 3500 Crewcab truck, the driver's door actuator stopped working mid summer of the first year, the other three door actuators stopped working within the next 2 years.  Fortunately they were covered under the warranty. 

If you are out of the warranty period, you can use an aftermarket actuator.  I personally have used DEI actuators for my customers whose factory actuators stop working.  They work great and I do not remember making any major modifications to interface it.  Just figure out the correct wiring config, which is easy enough.  I do not advise using the generic cheap actuators we can all find, they are often too weak.  I have not had any problems with the DEI actuators and I have been replacing factory actuators for 10+ years.