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28th September 2021, 08:09 | #1 |
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MG ZT-T Join Date: Sep 2021
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Wipers and fan query
Hi all,
New to the forum and first post. Want to thank everyone who posts as I’ve already found a wealth of information on here as I’ve being doing jobs to the car. I have a couple of queries I could do with assistance on. I’ve had a look and found similar issues but no definitive answers. 1. Rain sensing wipers. Mine currently don’t work correctly at the first setting that should be the intermittent rain sensing. I just have ‘on’ permanent wiping. I’ve switched the relays round and checked fuses but no change. Additionally the prism (on the glass) doesn’t appear to have any damage or deformities. Any suggestions before I take off the sensor body and swap it over? 2. Engine fan and AC. My engine fan comes on (really high speed) regardless of outside temperature when I put on the AC. If the AC isn’t on the Fan kicks in around 100Degrees to cool the engine normally. Having had a ZT a few years ago in don’t remember that happening. Any ideas or now just a querk of a ageing car?! Thanks
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28th September 2021, 11:20 | #2 |
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Swap the ecu on the rain sensors (the black unit that’s clipped to the screen)
The Dan sounds like your low speed has failed, can you see a silver resistor behind the grille on the plastic fan housing?
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28th September 2021, 11:27 | #3 | |
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Diesel
Quote:
If the fan's triggering at 100˚ then the fault must be elsewhere. The symptoms you describe suggest excessive air conditioning refrigerant pressure. This may be caused by loss of fins on the condenser or previous incorrect charging. Book a home visit from a local self-employed mobile air con. specialist. Do not go to Fast-Fit outfits or general garages offering air con. service. Simon
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28th September 2021, 16:32 | #4 |
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28th September 2021, 17:00 | #5 | |
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Thanks for the reply’s.
Quote:
“ The Dan sounds like your low speed has failed, can you see a silver resistor behind the grille on the plastic fan housing?” I’ve had a look through the front upper and lower grills and couldn’t see a silver resistor. Where should it be located? I’ve a wiper ECU to swap over so will give that a try.
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30th September 2021, 10:49 | #6 |
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Hi guys.
Quick update a change of the ECU sensor box has resolved the wiper issue. Now just leaves me the fan, which I suspect will be worn brushes.
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1st October 2021, 06:35 | #7 | ||
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Quote:
You've reported that your fan works on both slow speed and probably medium speed here: Quote:
You also might like to reconsider my post no. 3. Best wishes, Simon
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