Red front shifter not working in the cold.

[Scoops]

Wow, weird. Heated shifters?? OMG, a bit of a drastic solution!

[mattr]

How cold? Below freezing?
Might be condensation getting onto the working surfaces of the shifter when you take it out side, then freezing.
Bit of light spray oil to keep the water away?

[mattr]

Possibly indicative of something that is on it's way out then. Difference between room temp and 8 degrees shouldn't be anywhere near enough to cause problems in a properly set up shifter.

Might just be worth a complete strip down and re-cable, just to see if it is set up properly.

[rijndael]

Might just be worth a complete strip down and re-cable, just to see if it is set up properly.

I agree. I wouldn't be surprised if you found a frayed cable.

[743power]

Do you have the original red gore cables? If so, I would swap out the inner cable first and check all the ferrules for signs of clogging from the coating that's shredded off the cable.

After that, peel back or remove the hood and check for dirt or debris inside the shifter, particularly towards the bottom. Spray some alcohol or fast disolving solvent like clean streak in there, let it dry and put some grease on the pawls and ratchet gear. Just a dab or two with a q tip is fine.

[theremery]

I'm gonna guess it's a steel cable, Juan. Just a tiny bit of expansion/contraction of the cable going on? (maybe exacerbated by clingy grease getting a little thicker as it cools). Give it a QUICK SPRAY OUT with crc or similar to reduce internal grit and re-cable it and she'll be back to normal, would be my guess. I'd certainly give it a go! (you'll have to get SOME lube back in there somehow too).