Brilliant, thanks Roverlike.
The info you provided includes Additional Relays and the relay I was wondering about is an 'Air Conditioning Pack Relay Module" which controls the radiator fans + the AC compressor clutch, the items which have failed.
I imagine the relay will be easier to find either new or second hand and will certainly be easier to fit and less worrisome than the ECU sets.
I'm very grateful. 2.png
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I'm still chasing this overheating issue so further suggestions will be appreciated.
Reminder: MG TF 2002 135 with air. Getting near max temp (almost to the 4/4 point) in stop-start traffic, returns to normal temp quickly when moving. The engine bay fan activates when the car is hot therefor temperature sensor seems to be working.
So, as suggested, the engine fan has been checked and found to work fine when hit with 12 volts, so can now assume it is not getting a signal to turn on as coolant level rises.
I've now found that the AC isn't working although the refrigerant level is fine and the AC guy suggests it is unlikely that the compressor is faulty, thus suspects it's not getting the appropriate signal to turn on. (The idea was to turn on the air to activate the AC fan thus cooling the radiator, at least until a solution to possible ECU fault can be found.)
Also, I have learnt that the relay sitting between the fuse box and the 70 amp fuse under the front bonnet operates the cooling fans. My question now is, does this relay also operate the AC switching? If so, could it be the relay at fault and not the ECU? Guess I'm looking/hoping for a cause other than the ECU - I've been in communication with Bitz and they don't have the appropriate ECU set as the air-conditioned models there in the UK are rare.
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OK. Thanks for the guidance, process of elimination indicates the ECM isn't activating the fan which otherwise does run.
I think I heard somewhere that there are exchange services offered by some firms - is this correct and if so, where to go? Anywhere here in Oz (Cobber?)
It's a Mk1 TF with square fob, Lucas.
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My 2002 TF 135 started overheating while driving in stop-start city traffic yesterday, a warm 27deg here in Adelaide. This hasn't been an issue previously.
Temp gauge got to just above the ¾ mark but returned to normal range once we were in clear air and moving. Temp also went high again climbing windy hills roads but dropped quickly on more level terrain.
No coolant loss and inspection of the dip stick and filler cap shows nice clear oil, no mayo.
I'm suspecting the radiator cooling fan may not be working? Checked the fuse and all OK there. The engine bay fan ran for a while after stopping with engine off.
Is there a simple way of checking if the radiator fan is functioning correctly? Help please.
Possibly just coincidental, but a couple of weeks ago the expansion tank cap 'blew' with the associated spectacle of heaps of steam and about 1 litre of coolant loss. A new (genuine) cap appears to have solved that issue.
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Despite lots of searching around, it seems it's impossible to find a wind stop, the open weave mesh type, either new or used here in Oz, needed for an '02 TF.
MGF&TF Bitz appear to have them sometimes but not at the moment.
So, does anyone have experience with a solid clear perspex type? I vaguely recall seeing a pic or two with these fitted to an F/TF, so if they would work as well as the fabric style, I'll attempt to fabricate one - fixing brackets may be a challenge!
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Just looked at the Rimmer's catalogue diagrams and the non-air setup doesn't have the pulley.
Apologies if I caused you concern.
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Mine is a 2002 TF and definitely has a tensioner pulley associated with the alternator (ancillary) belt.
It has air con & don't know if that makes a difference. 18.png
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