First time poster here but been lurking in the background for a while!
This is the 3rd time I've written this post as the app kept crashing near the end of my post!
Here goes again! I'm hoping to get some advice on an issue I've got. Recently bought a 2008 CTR (89k on the clock) and the AC heater control unit has stopped working. I have no fan, temp, demist (front or rear) and the fan settings no longer show on the clock/radio display. It's as if the OFF button has been pressed. When I turn the headlights on the controls light up still. I noticed at the same time as this fault the external temp reading stopped showing too and now reads "---".
I've done as much research on this as I can, mainly from this forum and YouTube vids etc. Ive checked all fuses inside and under bonnet and all seem ok. I know driver side fuse 14 is for the HAC and power mirrors that fuse is ok and my power folding mirrors still work. I've tested voltage on fuse 12 under bonnet which gets a constant 12v.
I've read about the resistor fuse and tonight discovered where that should be located so I've got that to look forward to. But up until then I came to the conclusion that it was the heater control unit that was at fault. I bought a 2nd hand one and fitted today but that didn't make any difference at all.
I think I only have a cpl of options left:
1. Replace / test that resistor fuse thing
2. Test heater control unit power (loom)?
2. Focus investigations to external temp sensor maybe that caused it all?
3. Admit defeat and put into garage for further investigation.
4. Cry into a pillow due to #3
I'm at a loss as she's my daily driver and having to drive with windows down ALOT to clear the windscreen isn't fun. And is defo not fun in the rain! The only upside is I get to listen to that engine sound instead of my music!
Can anyone help me test further or confirm yeah fix the fuse and you'll be laughing! Is there a way to test the heater control unit when it's out the car with a psu providing power to the reqd pins? It doesn't have any blown circuit marks either.
Any help would be hugely appreciated!
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