temperature sensitive door locks

[hgarraway]

2000 Sierra 2500

 

This problem only occurs when the outside temperature is above about 65 degrees or when truck (it's black) is heated by sunlight. It exists using remote or door switch. I have replaced the door lock relay (under dash to right of steering wheel even though I knew it was related to OUTSIDE temperature, not cab temperature.

 

When over about 65 degrees ALL locks drag and don't lock OR unlock although I can hear the actuators 'trying'. Is it possible that one bad actuator could cause the others to drag? Maybe a coil breakdown in one limits current available to the others?

 

I guess I can wait until weather is cool again and then try heating each door individually with a lamp or hair dryer to try and find the offending one without tearing into all of them.

 

Thanks to the reply to my AC relay question earlier today. This is a 'new' used truck to me and everything else seems to be working great.

 

Hugh

[GM-Tech]

I suppose it's possible for one actuator to affect the others, though I've never seen that. I suspect there might be a connection problem somewhere that would affect power to all actuators. I'd have to look at a schematic to see what could affect everything.

 

I haven't seen this in door locks, but I've had other electrical problems that only occured after the vehicle sat in the sun for a bit and heated up. Had a Camaro that wouldn't start only after sitting in the sun for several hours. Turned out to be a spread female terminal in the circuit that supplied power to the pump. When it got hot in the interior, the terminal would expand and lose its connection. The terminal was just slightly spread and had low tension and when it got hot, no power to the pump... or not a sufficient amount.