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Hi,
the probs of overheating seems to return forever.,
If ther is is 100 % glycol in it, let flow 5,7 liters away by the draining cock, (on the engine down under the exhaust manifold).
Top up with 5,7 liters of demineralised water to obtain a mixture of 60% water and 40 %glycol.
(I run at 70 % water, in summer know the temp gauge is just below 9 h 00).
This a the summery of my earlier posts( not necessary to jump to there, I copied everything: . http://www.brickboard.com/RWD/index.htm?id=651394 http://www.brickboard.com/RWD/index.htm?id=648698 http://www.brickboard.com/RWD/index.htm?id=650353
Lets give you some ideas…
Also check the level of coolant.
Also coolant has to be changed every 3 or 4 years (depends on mileages).
IF you never do it, holes come in it and it gets clogged.
(The radiator of my father 740 turbodiesel never was changed, until he breaks/died/clogged at age of 12 years - 150 k miles).
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The fan: everybody says: check the fan, but wat is this????
The mechanical clutch fan:
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If you start your COLD engine, and you rev IMMEDIATELY to 2000 - 2200 rpm,
you must hear a relative LOUD sound of the air displaced by the fan. (coupling is strongst - the least slip)
After 10 seconds, the fan start to rpm lower at the same RPM of the engine, because the engine is still cold.
The mech fan reacts on ambient temp , trough a spiral wire in the center of it.
It redirects the visco flow inside the mechanical clutch.
With a hot engine, the mechanical fan makes more noise than the engine because it pulls a lot of air trouhgt there, you can feel the air flow under the car with your hand, even if you are in the car.
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HOLDING THE MECHANICAL FAN WITH YOUR HAND OR BLOCKING IT WILL NOT PROVE ANYTHING!!!!!!! YOUR MECHANIC WAS SIMPLY GUESSING AND NOT KNOWING WHAT HE WAS DOING888
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Let me clarify some severe errors, posted here much earlier.
1.It is absolutely unusufull replacing the thermostat after each reaplacement of the cooling liquid. (mine lasted 240 000 km)
2. The thermal capacities of pure (100%) water are superior to any mixture of glycol / water.
Glycol is added as antifreeze and temperature riser of the cooling system.
The glycol REDUCES the thermal capacities of pure water, but improves freezing protection an rise ot the boiling point of the mixture.
BUt VOLVO rads are designed for this mixture (as all cars).
I drive a 30 % glycol and 70 % water: this keeps the engine always EASILY at temperature (moderete climate).
This certainly helps cars with AC, because a 30/70 mixture can draw off more heat than a 50/50 mixture.
Also other chemicals are added as anti foam and corrosion inhibitor
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Volvo’ s with AC in hot weter and slow trafic:
You can decrease the head load by reving to 2000 à 2500 rpm in lowest gear to force a lot of wind / air trough the radiator.
The problems with cars with AC is that the extra condensor in front of the engine radiator CHOKES the air stream trough the engine radiator and also heat this air a little more.
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++EMERGENCY TIP OVERHEATING++++++
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If someone ever has an overheating problem due to a blocked thermostat
(symptoms are temp gauge keeps rising, the hose connected to thermostat is almost at ambient temperature, no coolant flow through radiator):
1. park car aside the road, keep the engine stationar, hand brake,
open bonnet, PINCH WITH YOUR HANDS WITH EFFORT IN THE RADIATOR HOSE CONNECTED TO THE THERMOSTAT:it acts as a massage to relief the thermostat from beeing blocked: it goes open and you regain cooling flow.
I needed to do this , even in autumn!!, and it worked.
2. Stop and shut of the engine-)-)-)-), because hot spots in the cilinder head are not far away
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Most frekwent causes of overheating
1. Clogged AC radiador
2. Also clogged engine radiator.
3. Bad alternator belts (you hear the screaming sound if they turn ad diff rev speeds)
4. Failure of the electric fan relay/ failure of the fan/ blown fan fuse/bad thermostat switch of the fan
5. wrong anti-freeze mixture (too much anti freeze)
6. level of coolant in system too low
Another option is to go for the tropical radiator for the volvo 240. It’s a taller one, which has the same form as de volvo 240 DIESEL (Europe models).
Succes
Kkurt
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240 '88 B200K wite sedan 255K km Europe virgo+all turbo gauges
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