I own a 2005 chevy malibu,when its really cold out the back doors wont shut and lock

Question edited for clarity and added a bit of punctuation.

First make sure the coolant system is full by removing the radiator cap, as opposed to the expansion bottle.

Part of the job of the blend door actuators is to cut off airflow from the heater core and only allow air in from outside. They would be the first thing to check.

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You may have a bad body control module.

You'll need to figure out if you are loosing fuel or spark when it fails to start to be able to proceed.

hmm. you have automatic daytime lights? really people need to look into this issue. there are 2 power sources. 1 is always hot. which will be the battery lead the other will be power lead to ignition or automatic daytime running light. if your in your car turn on the ignition and shut it off. radio should still be on until either A. the door opens on drivers side or daytime lights shut off.

you might have a short circuit in your car, or a loose cable somewhere, I don't think the car is overheating, I think that the temperature sensor (commonly screwed to the engine by a water return hose) is not working well, probably the bimetalic material is all wear out, you might consider change it.

Hi ,
Check your owners manual (first) the go to the door itself and look at the under side of the door and you will see a sticker guide to the operation of the safety locks . It's usually a slight turn (90*) on a simple mechanism within the door lock assy .It's always a good idea to lock the traffic side door with children on board. GOOD LUCK

open the rear door, look at the door latch (on the door) there is a small lever to turn the child lock on/off. its in your owners manual.

if you are mostly having trouble with cold weather,i would check the engine temp sensor,it tells the computer how cold your engine is so in the morning the computer will increase fuel like an old carb with a choke

check wiring going to door there is a black rubber boot going to door wires have rubbed to a short. roll windows up and down if locks start working thats the door to check If one of your door locks don t work, check wiring

Hello I am not sure if this is the exact fix but I was having the same problem and I took my Malibu in to be checked and it appears to be a problem inside the steering column. When I turn the steering wheel it makes the door locks go crazy!! So although this is not a fix it may be a place to look for a frayed wire or a short in the wires. I am taking my Malibu in on Monday to be checked. Good luck to all having the same problem.