Hi everyone,
Mu 850 has heated seats and they somewhat work, but for a 15 year old car, the heat isn't that strong.. is there anyway I could fix them so they could work better? Like a recharge if that's possible?

 

A recharge? A heated seat has coils that run underneath the leather skin, you can't recharge it. Best thing you could do is buy a working seat heater and remove the seat skin, and replace.

 

...or change the thermo switch to a higher temp. Dont ask me where to get one but thats what shuts it off at a specific temperature.

 

I would buy a new heater pad and just replace it. I would not use a working used one because it would be no fun to have to replace it in a year.

 

Has anyone ever measured the seat surface temperature of a heated seat ?

As for the heater being "weak" the other thing to check is the wiring, switch and connectors leading to it. A little corrosion at a connector could hinder the heater getting the full amperage it would need to heat the seat properly.
I would guess it's the sensor getting out of spec though.

 

i'll have to check out the wires under the seat one day.. what do these parts look like? lol

 

try heyah!

https://volvoforums.com/forum/volvo-850-16/heated-seats-not-working-fuse-good-27622/ (with pics!)

Hope that helps with your diag.