|
||
|
15th September 2016, 13:13 | #1 |
Regular poster
MG ZT Join Date: Sep 2016
Location: Stratton
Posts: 58
Thanks: 11
Thanked 2 Times in 2 Posts
|
Cooling (radiator) fan not working, '05 ZT 190
Afternoon all. As I have mentioned elsewhere on this rather excellent forum I have recently acquired an '05 ZT 190. It has had little use for a couple of years, maybe that's why the air con doesn't work. So, I searched the forum and read up on non-working air con, not a five minute job! I went through Jules's test procedure, cooling fan does not work at all. Compressor clutch can be made to engage by bridging the relay contacts. This then means that when the engine starts too get hot the cooling fan will not cut in. Would that be right? The temperature gauge stays steady showing no signs of an overheat. If the engine overheated would this not show on the gauge? Or a warning light/message? Also there is no resistor fitted, does this fitment depend on the type of fan, 2 or 3 speed? If I need a new cooling fan, whats available? John |
15th September 2016, 20:54 | #2 | ||||
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
Quote:
Quote:
Quote:
Normal running temperature is around 90°C give or take a couple of degrees. It will rise above this in stationary traffic, so the fan is needed. It should trip on at low speed at 100°C. Use the Trip Screen Diagnostic Mode (section 7) to find out what's happening. Diagnostic Mode: http://www.the75andztclub.co.uk/foru...ad.php?t=55585 Quote:
Before thinking of replacing the fan, you must first confirm which system you have. Resistors are usually visible, but odd ones were fitted out of sight. A definitive check is to take the bumper off and examine the fan motor or the control box. The 2-speed motor has two wires entering the case. The older 3-speed system has four. EDIT: Bumper removal is easy:https://www.youtube.com/watch?v=7BUGH4_VMkU TC Last edited by T-Cut; 15th September 2016 at 20:58.. |
||||
16th September 2016, 12:55 | #3 |
Regular poster
MG ZT Join Date: Sep 2016
Location: Stratton
Posts: 58
Thanks: 11
Thanked 2 Times in 2 Posts
|
My thanks to T-Cut for the excellent info. Put the car in to the Trip Screen Diagnostic Mode (section 7) and went for a drive. Temperature quickly went to about 90 and stayed between 88 and 95 degrees. I drove a mixture of town and country and it was only when I left the car idling on the drive that the temperature went over 95, I let it go to 102, the fan did not cut in so I stopped the engine. Looks like its a bumper off to find out whats going on.
Again, my thanks to T-Cut for the information. John |
16th September 2016, 13:02 | #4 |
Regular poster
mg zt Join Date: Mar 2014
Location: Helhoughton
Posts: 42
Thanks: 1
Thanked 2 Times in 2 Posts
|
Fans
Hello, please excuse me hijacking the thread but I talked my son into a ZT pre facelift and he bought a 1.8 injection. The problem he has is that the rad fan is cracked badly in a few places with one fan blade only held on by about an inch of uncracked plastic. Could someone possibly tell me if the facelift fan, radiator assembly will fithis car and if he is able to use a different cc fan for his 1.8.
Best regards, Alan |
16th September 2016, 17:16 | #5 |
Regular poster
MG ZT Join Date: Sep 2016
Location: Stratton
Posts: 58
Thanks: 11
Thanked 2 Times in 2 Posts
|
Front of the car off and had a look at the fan, 4 wires leave the control box and go in to the fan, would that be a 3 speed fan? The fan control box has three relays(?) inside. I have disconnected the wiring to the fan, the piggy back job on the chassis rail, if I reconnect that and try the demist test I should hear one of the relays click, would that be right?
Also, no sign of a resistor, the usual mounting point shows no evidence of holes ever having screws in them. More evidence of a three speed fan? Last edited by White horse; 16th September 2016 at 17:26.. Reason: Added more info. |
16th September 2016, 17:36 | #6 |
This is my second home
Rover 75 Saloon Join Date: Aug 2007
Location: Avignon
Posts: 4,466
Thanks: 94
Thanked 661 Times in 554 Posts
|
|
16th September 2016, 17:40 | #7 | |||
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
Quote:
Quote:
Quote:
You have two options. Try to rebrush the motor or replace the whole shebang with a later 2-speed system (or the aftermarket alternative), including control box (all plug and play). If the fan tests failed to run the fan at any speed at all, then I reckon your chances of recovering the old motor are pretty slim. Examine the commutator if you fancy a go. There's a Howto rebrush the motor and recommended suppliers if you do a key word search using the Google based search system: https://cse.google.co.uk/cse?hl=en&c..._YDw#gsc.tab=0 TC Last edited by T-Cut; 16th September 2016 at 17:43.. |
|||
16th September 2016, 18:27 | #8 |
Regular poster
MG ZT Join Date: Sep 2016
Location: Stratton
Posts: 58
Thanks: 11
Thanked 2 Times in 2 Posts
|
I am surprised I have a 3 speed fan in such a late built car.
Tomorrow I'll reconnect the wiring and do the demist test, hopefully that will trip a relay If that works I'll do this; reading back through the forum I came across instructions from Jules that involves swapping wires around that converts a 3 speed to 2. I'll give that a go, if it works then I'll try a re-brushing. John |
17th September 2016, 11:07 | #9 |
Regular poster
MG ZT Join Date: Sep 2016
Location: Stratton
Posts: 58
Thanks: 11
Thanked 2 Times in 2 Posts
|
Worked out how to feed 12 volts into the fan motor, no life in it so it looks like a new fan.
Also checked continuity in the wiring, all OK. I did this with the fan and control unit unplugged from the loom so as not to risk damage elsewhere. Would it be possible to do voltage checks with the fan and control box connected to the loom? |
17th September 2016, 11:14 | #10 | |
This is my second home
Rover 75 Saloon Join Date: Aug 2007
Location: Avignon
Posts: 4,466
Thanks: 94
Thanked 661 Times in 554 Posts
|
Quote:
|
|
|
|