Wot no thermostat!

Having got hacked off with the heater never getting warm and thinking that the temp gauge never moving more than a couple of mm was wrong I thought I better do something about it.

I thought I'd replace the thermostat first off as they are cheap and easy to do and then give the whole system a flush at the weekend if that didn't work. Imagine my surprise when I removed the thermostat housing and found nothing but water in there - there was no fricking thermostat fitted!!!

Anyway, the good news is that now it actually has a thermostat is warms up quickly and sits dead on centre of the temp gauge whether in traffic or on a run. Even better than that is that the heater is now half decent

Another one for my Landy learning experience!!!

Well done.
Now ditch the viscous fan and get a further improvement.

Nice one mate !!

It was a bit funny when I was driving round with a tee shirt on and window down, but you and your mate still had coats and hats on !!

ditching the viscous fan what improvement would that do

it'll warm up quicker and use less doozil.
and no, it won't get too hot - unless yer towing a heavy trailer up a steep hill in the sahara.

i fink yu said that before, Trew.

i remember that being said when I were a fookin newborn.

btw has anyone got a vissy spanner I can borrow?

yarbut the postage'll cost yer more than buyin one.

fair point. Speakin o which, this cheque should have cleared by the weekend, so's I can write one fer you

i won't hold me breff.....

oi yer jockey.

PM us yer details fool.

Treworgey 90 said:

it'll warm up quicker and use less doozil.
and no, it won't get too hot - unless yer towing a heavy trailer up a steep hill in the sahara.

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or tow starting a van on a flat in wales. In winter. When its cold.

Fit a leccy fan if theres the chance of you usin your landy hard at some point, cos its too late if you aint got one an need it.

Why take off a perfectly good viscous fan ? They dont lock up unless the rad temp goes up, and that only happens when the thermo opens .
The fan only goes round because the airflow thru rad is driving it , when unlocked, the airflow is cooling the rad not the fan pulling air thru.
The thermo controls eng temp , not the water temp in the rad (unless due to flow restriction heat loss from rad is less than that required to cool engine), when o/heat will occur . Do you think vehicle manufacturers would fit viscous fan if it lead to overcooling of engine which would make it harder for them to meet emmission requirements? .

According to the workshop manual I've been reading tonight the fan is fitted for cooling when the vehicle is stationary, so probably essential for use on the M25, but not in the countryside. A kenlowe makes sense if you can afford it as despite the viscous coupling fans waste energy and therefore diesel. :-(

tacr2man said:

Why take off a perfectly good viscous fan ? They dont lock up unless the rad temp goes up, and that only happens when the thermo opens .
The fan only goes round because the airflow thru rad is driving it , when unlocked, the airflow is cooling the rad not the fan pulling air thru.
The thermo controls eng temp , not the water temp in the rad (unless due to flow restriction heat loss from rad is less than that required to cool engine), when o/heat will occur . Do you think vehicle manufacturers would fit viscous fan if it lead to overcooling of engine which would make it harder for them to meet emmission requirements? .

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ALL viscous coupling fans WILL drive and draw air ALL THE TIME.

They are made to do that for one very obvious reason.

No fan can OVERCOOL an engine, unless the thermostat controlling the coolant is goosed.

The viscous coupling fan may slip quite a lot compared to a solid drive fan, and so absorb less power, but there is no escaping the fact that they MUST draw air through the radiator onto themselves OR THE COUPLING WILL NOT HEAT UP and make the clutch slip less and grip more. In other words they MUST do the very thing they are designed NOT to do, in order that that will work at all.

In effect a viscous coupling is only a good idea in theory. Like EGR.

CharlesY

vengeful elephant. as your in never never land. tell that peter pan i know where he lives and will be sailing that way soon

HOOK said:

vengeful elephant. as your in never never land. tell that peter pan i know where he lives and will be sailing that way soon

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"First they did it on the bed .... then they did it on the floor .... " and by the way there's a big crocodile just waiting to meet you .... AGAIN!

I have a Griff with the fan removed, of cousre ! With a thermo fan cut in it is simple, but i have half speed fans to start with, follwed with the full speed, if needed. I will be doing the same with the 90XS i have also.

Yes I agree that a viscous fan does by virtue of the fact that the mounting is not frictionless turn and draw a small amout of air . The amount of power that it absorbs doing this miniscule , you can stop an "unlocked" viscous fan by putting one finger in the blades (if you doubt me and decide to try and disprove it it is at your own risk) . This amount of power small as it is , would be offset by the ram air effect caused by moving the vehicle forward even at a very moderate speed. You could even argue that the small amount of power consumed by the fan when vehicle stopped is offset by the extra power induced by the ram air effect when the vehicle is in motion (ala autorotation effect in helicopters)
In the majority of cases it is ram air that does the cooling above a certain speed (variable) as the airflow is in excess of the capabilities of the fan anyway .
I did not state that a fan can overcool an engine, as you rightly state its the thermo that is the arbiter of engine temp upto the point that the rad and fanand coolant flow cant cope with dumping the heat load .
I agree the fan is designed to cope with engine cooling when stationry, upto a point depending on engine output power requirement . Usually this is not anything approaching the full power take off capability , and should this be so required eg generator/ pump then extra steps have to be taken . In the days of series vehicles the optional equip catalogue used to list these. (13 blade fan , twin belt drive , oil cooler etc )

I have to disagree that viscous drive is only a theoretical success, as it is used by all manner of vehicles from small cars with inline motors ( not that many now) to HGV , tractors , stationary plant, not many lekky fans there. JMHO