Overheating problem solved - eventually!

chicochapman · 31st October 2021, 10:01

2002 KV6 114k Miles

A few weeks ago, the dreaded "Engine Overheat" warning appeared and I managed to tiptoe about a mile and a half home.
First thing I looked at was the expansion tank cap. The O-rings were pretty flat and my local garage kindly supplied some rings that were almost the same. No Luck.
Next I noticed the fan wasn't running so decided to check the motor brushes.
After a lot of bother with seized fasteners (much Dremel work here) I renewed the brushes. No luck.
Taking it all apart again I saw the commutator was worn concave, so really goosed. I then fitted a new fan(2-speed, silver resistor); that worked ok but still overheating.
Next, having felt the top hose was cold, I replaced the thermostat.

https://www.the75andztclub.co.uk/for...=129825&page=9 post 90

Still no luck, top hose hot but coolant being expelled from the cap. So although thoughts of HGF were creeping into my mind, I bought a new cap.
Joy of joys - all ok and back on the road!
Quite how three things all went wrong at the same time I don't know but maybe running on engine overheat for 5 mins was the root cause.

All this took about 3 weeks with weather interruptions and waiting for parts and I'd just had the front end re-painted requiring delicate handling.

New fan £200
Brushes £50 ( passed on to another member)
Thermostat £50
New cap £20
Gallons of OAT £32

It soon adds up!!

COLVERT · 1st November 2021, 11:52

Where on earth did you buy the thermostat and brushes ???----

---Well over priced.

Arctic · 1st November 2021, 12:11

Quote:

Originally Posted by COLVERT

Where on earth did you buy the thermostat and brushes ???----

---Well over priced.

They used to be £25.00 for four from the link below now they are £36.00

https://engineeringcarbonproducts.co...variant/795934

SD1too · 1st November 2021, 14:54

Quote:

Originally Posted by Arctic

They used to be £25.00 for four from the link below now they are £36.00

Plus £5.94 postage gives a total of £41.94.
It's still a cost effective repair compared with a completely new fan system though.

Simon

31st October 2021, 10:01	#1
chicochapman Avid contributor MG ZT-T Join Date: Feb 2019 Location: Stockport Posts: 134 Thanks: 56 Thanked 22 Times in 20 Posts	Overheating problem solved - eventually! 2002 KV6 114k Miles A few weeks ago, the dreaded "Engine Overheat" warning appeared and I managed to tiptoe about a mile and a half home. First thing I looked at was the expansion tank cap. The O-rings were pretty flat and my local garage kindly supplied some rings that were almost the same. No Luck. Next I noticed the fan wasn't running so decided to check the motor brushes. After a lot of bother with seized fasteners (much Dremel work here) I renewed the brushes. No luck. Taking it all apart again I saw the commutator was worn concave, so really goosed. I then fitted a new fan(2-speed, silver resistor); that worked ok but still overheating. Next, having felt the top hose was cold, I replaced the thermostat. https://www.the75andztclub.co.uk/for...=129825&page=9 post 90 Still no luck, top hose hot but coolant being expelled from the cap. So although thoughts of HGF were creeping into my mind, I bought a new cap. Joy of joys - all ok and back on the road! Quite how three things all went wrong at the same time I don't know but maybe running on engine overheat for 5 mins was the root cause. All this took about 3 weeks with weather interruptions and waiting for parts and I'd just had the front end re-painted requiring delicate handling. New fan £200 Brushes £50 ( passed on to another member) Thermostat £50 New cap £20 Gallons of OAT £32 It soon adds up!!

1st November 2021, 11:52	#2
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Where on earth did you buy the thermostat and brushes ???-------Well over priced.