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The heater matrix and the aircon evapourator are two seperate things, the heater matrix is in the inside of the car and the aircon evap is just after the fan under the scuttle panel.
How I imagine it works is it just cools and drys the incoming air and then its passed through the heater which...
Tracking across on the rear lights, they've got water in them. Take them off and dry them out (airing cuboard for a few hours should do), you might not be able to see anything in them but its whats causing it. Mine was coming on with the brake and reverse lights, but its just depends where its...
I've got a fault code reader coming in the post to check on that one, i'm also borrowing a throttle pedal and body from MarkM so hopefully should be able to narrow it down between those two.
Not 100% on the aux belt procedure with the 172 but if its anything like my old 1.6 (very similar design) then theres plenty more effort to be made to change the cambelt as well.
You need to remove/refit the aux idler and tensioner, lock the cams correctly, replace the cam core plugs once...
The magnex ticks all the boxes for noise, a lot of people on here will warn you off them because they're a bit fiddly to fit, and the look of them is a little marmite. But i've got mine fitted fine after a little tweaking (and new exhaust rubbers), it does seem quite well made and solid as well.
Was thinking of getting a fault code reader on it but its not showing any warning lights so I doubt theres been any faults stored. Its not like its in limp home mode, its very strange as it still drives fine apart from this.
Thought this as well but the engine temp gauge doesn't move about, and it doesn't hold the cold idle anyway. Usually way above that, had it holding at 2krpm earlier.
Cold idle level is fine, so is the hot idle its just that it never uses them! Filter is fine, the 172 F4R uses MAP instead of MAF and that looks fine too.
Have had a wierd problem develop yesterday evening, basically when cold you can rev the car and it'll hold idle at 1500-2000rpm then slowly decrease (sometimes not) and when its warm its not as bad but the car doesn't loose revs like it did before much more slowly and sometimes holds.
Any...