Is my cooling fan kaput

Robti · 5th August 2015, 14:19

Hi looking for some help I have the silver resistor fitted at the two o'clock position and when the car is started no rotation switch on demist,and it kicks in to full power, any help if it's faulty and if I need a gold resistor ?

Thanks

Greeners · 5th August 2015, 14:22

sounds like the resistor has failed, cheapest and easiest place to start

Robti · 5th August 2015, 15:16

Thanks sitting still it kicks in on the 100 mark, will order a gold resistor kit

SD1too · 5th August 2015, 17:16

Quote:

Originally Posted by Robti

Thanks sitting still it kicks in on the 100 mark, will order a gold resistor kit

No point Robert. If the fan starts at a coolant temperature of 100° then your silver resistor must be OK. Note that the slow speed on a resistor system can be very loud, misleading the owner into thinking that the fan is running at full speed.

Simon

Salad-Dodger · 5th August 2015, 17:29

Hi Simon. I'm still trying to get my head round the fan system. As far as I can tell, on my facelift 190 the fan comes on at the required 100 degrees but as I have yet to get the air con re-gassed after the engine swap, I haven't heard the fast speed yet! (I think) Do I take it that the fast speed will be the one I hear when the air con is used?
I must get it gassed as all I have at the moment is warm air! Steve

SD1too · 5th August 2015, 17:39

Quote:

Originally Posted by Salad-Dodger

Do I take it that the fast speed will be the one I hear when the air con is used?

No Steve. With the air con. operating the fan should be running continuously at slow speed. The faster speed will trigger if the refrigerant pressure rises above a normal value.

That's the basic answer!

Simon

Salad-Dodger · 5th August 2015, 17:46

Thanks Simon. I suppose then that with a bit of luck, I may never hear it!
I think I'll have to sit down and brush up on how it all works. Steve

Robti · 5th August 2015, 20:16

Air con at any temp causes the fan to run at high speed, never seen the fan at slow speed

RayH · 5th August 2015, 23:04

Quote:

Originally Posted by Robti

Air con at any temp causes the fan to run at high speed, never seen the fan at slow speed

It shouldn't do.

SD1too · 6th August 2015, 07:28

Quote:

Originally Posted by Robti

Air con at any temp causes the fan to run at high speed, never seen the fan at slow speed

How do you know that you're hearing high speed then?

Simon

5th August 2015, 14:19	#1
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,979 Thanks: 616 Thanked 228 Times in 210 Posts	Is my cooling fan kaput Hi looking for some help I have the silver resistor fitted at the two o'clock position and when the car is started no rotation switch on demist,and it kicks in to full power, any help if it's faulty and if I need a gold resistor ? Thanks __________________ Robert

5th August 2015, 14:22	#2
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	sounds like the resistor has failed, cheapest and easiest place to start __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

5th August 2015, 15:16	#3
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,979 Thanks: 616 Thanked 228 Times in 210 Posts	Thanks sitting still it kicks in on the 100 mark, will order a gold resistor kit __________________ Robert

5th August 2015, 20:16	#8
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,979 Thanks: 616 Thanked 228 Times in 210 Posts	Air con at any temp causes the fan to run at high speed, never seen the fan at slow speed __________________ Robert

5th August 2015, 17:29	#5
Salad-Dodger Gets stuck in MG ZT-T 190 Join Date: Feb 2015 Location: Chatham Posts: 592 Thanks: 34 Thanked 66 Times in 62 Posts	Hi Simon. I'm still trying to get my head round the fan system. As far as I can tell, on my facelift 190 the fan comes on at the required 100 degrees but as I have yet to get the air con re-gassed after the engine swap, I haven't heard the fast speed yet! (I think) Do I take it that the fast speed will be the one I hear when the air con is used? I must get it gassed as all I have at the moment is warm air! Steve

5th August 2015, 17:46	#7
Salad-Dodger Gets stuck in MG ZT-T 190 Join Date: Feb 2015 Location: Chatham Posts: 592 Thanks: 34 Thanked 66 Times in 62 Posts	Thanks Simon. I suppose then that with a bit of luck, I may never hear it! I think I'll have to sit down and brush up on how it all works. Steve