Sik_witit

This is my second e60 and the heat is just horrible. Driver side gets kinda warm and passenger side is cool. I-drive in the winter settings. Any suggestions? Antifreeze full. No check engine light. Car warms up normal. I don't get it.

miii

Could be water valve. it's possible that it's stuck. It regulates the temperature depending upon temp control setting you choose. Look it up on realoem under AC/Heater section.

E60Japanese

It could also be your micro filter
If it's blocked it won't let the air through the heater radiator to get heat to your interior

Duracell8

Water valve fail in the open position to allow water to flow to the heater core for safety reasons. I have seen a few clogged heater cores. You need to check the temperature of the hoses going and coming from the heater core with a IR temp gun.

jtbgonesailing

Is your outside temperature gauge reading properly? That external sensor is used by the cpu to set the load and achieve proper inside temperature.

cmyachtie

Would you also happen to know what the differential should be between input and output?
Thanks

Sik_witit

Where's the micro filter located? I unplugged the valve and it's still not working. Might have to take it out and clean it.

Sik_witit

The on on the cluster? That reads fine

Sik_witit

Micro filters are good

akgolfpro

same exact problem with my car right now!