Rad Fans Not Turning On? Also Passenger Side Air Cold..

[rickya]

I've just changed the coolant in my car, ran it on an incline with the rad cap off heaters on full etc, however the radiator fans still aren't coming on?

I drove it round the block and left it running for a good 20-30 mins and the temp never went above half..

Any ideas? Should they 100% come on once it gets to half way? As that's what I've read in all the tutorials.

Also I noticed yesterday after taking the centre console out to have a look at my radio that the passenger side vents don't blow hot air out, only cold. The drivers side is red hot.. could I have knocked something?

Any help appreciated.

Thanks

[steve2006]

Chances are with the cold weather we are at presently experiencing is the engine will not get to the point where the cooling fans need to kick in. Providing the temperature gauge doesn't go much above it's normal mid range position I wouldn't worry but obviously keep an eye on it if sat in traffic for a period of time.

Also if you were running it with the cap off the fans probably wouldn't cut in as the coolant only reaches a higher temperature when the system is pressurised

I notice on mine that the temperature gauge seems to read slightly lower when fresh coolant is installed but then creeps back up to it's original position after a month or so, may be something to do with better heat conduction with fresh coolant.

As for the AC problem there is a chance that you have either disconnected or broken on of the control flaps or their operating mechanism.There are a lot of flaps,levers and servo motors under the dash controlling both air flow direction and temperature so it may be worth re-checking the area where you were working.

I know on some Lexus models the flap mechanisms can be damaged by replacing the pollen filter with these set in the wrong position.