13 replies to this topic

[cal844]

Hiya folks, a quick question...

My minis are overheating slightly(about 3/4 on the guage) in this warm weather.

What size of auxiliary fan do I need to fit?

I can get 12 inch fan kits for £15 each but I'm unsure if they'd be too large, or use too much power?

Thanks again!

[Northernpower]

When are they overheating and are they overheating to the point of boiling the coolant out?

[racingbob]

mine is a 9 inch fan

[nicklouse]

have you still got your winter stat in?

[cal844]

When are they overheating and are they overheating to the point of boiling the coolant out?

One car is a 1980 clubman estate (fitted with a 1994 year 1275cc A+)
The other is a 1989 Mayfair with a 998 A+.


The cars dont burn oil or use water, and also don't smell hot but I'd rather spend a few ££ on a fan for each engine (2 cars) just to keep the guage in the middle (ISH)

I have no thermostat fitted to these engines, they don't boil over, or give any signs of overheating (just 3/4 guage on the guages).

[cal844]

mine is a 9 inch fan

Perfect, can you remember the supplier? Or can I just order them on eBay?

[Chris.Williams]

mine is a 9 inch fan

Perfect, can you remember the supplier? Or can I just order them on eBay?

I run this one, works great. https://rover.ebay.c...tm/292504266232

[racingbob]

yes ebay one fine like mine been on there 2 years

[Spider]

I know your thoughts on a thermostat (from a previous thread), however, why not try one? I find an 82 a good all-rounder.

 

Also, I'd suggest measuring the actual temp, as you might be trying to 'cure' and aliment that isn't there.

 

If indeed they are running warm, then I'd suggest looking for the cause rather than masking it and leaving the underlying issue there. It won't get better and will likely get worse.

 

Temps here in Aust in summer regularly get in to the 40's and the hottest temp I've driven is was 53, and all on standard cooling system, including a thermostat but no by pass. On these hotter days the temp sure does come up a bit, but Iit's not gone over 92. On 30 degree days (and lower), the running temp still remain around the 82 mark.

[area51]

When were the water pumps changed. After a while, if it is an old pump, the impeller corrodes and therefore becomes inefficient in pumping coolant around the engine

[cal844]

The pump is 1 year old on the estate, and 2 years old on the Mayfair.

We have flushed the coolant circuits on both cars, could a restricted heater matrix cause warm running?!

We usually just switch the heater matrix fans on to try to cool the cars. I think I will be fitting a new matrix to the estate (needs stripped as the heater control panel bracket rivets are very loose causing a rattle)


The reason I don't use a thermostat is to ease pressure (when engine hot and cap is opened there is the hiss of air) in the system and load on the engine.

Thermostats I have( 2*88° and an old 82°) seem to be clogging with the crusties floating in the system(even after 3 full flushes (when ever we have had engines or radiator out)

Edited by cal844, 06 May 2018 - 09:21 PM.

[cal844]

mine is a 9 inch fan

Perfect, can you remember the supplier? Or can I just order them on eBay?

I run this one, works great. https://rover.ebay.c...tm/292504266232

Thanks for the link, and to all other contributors! I will keep an eye on this once we fit the fans 😁

[Northernpower]

The size of the cooling fan is less important than the amount of air it moves; measured in cubic feet per minute (cfm). I asked the question is it boiling the coolant out or are you just wanting to keep it cool.

As its not boiling the coolant out it would appear you have no major problem. If you're just wanting to keep it cool look for a fan that moves the highest cfm for the lowest electric power consumption. My engine gets very hot in traffic and I keep it from boiling with and auxiliary electric fan. It's 80 watts and needs a 20amp blade fuse.

[cal844]

The size of the cooling fan is less important than the amount of air it moves; measured in cubic feet per minute (cfm). I asked the question is it boiling the coolant out or are you just wanting to keep it cool.

As its not boiling the coolant out it would appear you have no major problem. If you're just wanting to keep it cool look for a fan that moves the highest cfm for the lowest electric power consumption. My engine gets very hot in traffic and I keep it from boiling with and auxiliary electric fan. It's 80 watts and needs a 20amp blade fuse.

You are correct, it just runs warm, with no boiling over, or loss of coolant. Thanks all contributers for the advice 😁