With a mildly faulty cap this venting of coolant will continue at each period of use until the cap is replaced. With a faulty radiator cap and the vehicle park on level ground or facing up hill, any vented coolant will not be visible as it will fall on to and be absorbed into the tray. When the ignition is switched off, no further forced cooling is possible with the stock fan. In a hot engine with the stock fan running any released coolant will fall onto the under tray and will quickly evaporate. However, once the car is stationary the radiator may not provide enough cooling to prevent the coolant level from getting so high in the reservoir bottle that some coolant is vented off from the reservoir cap. Under driving conditions the cooling effect of the radiator may be sufficient to counteract the reduction in pressure caused by a minor fault in the cap. If you have a faulty cap it cannot sustain the pressure of the system and allows extra fluid to be transferred to the reservoir bottle. The most common cause of fluid loss is a faulty radiator cap. If you are losing coolant, each warmup-cooldown cycle will empty the expansion tank further until it's dry. As the system cools, coolant is drawn back into the system and the level of coolant in the reservoir will return to its original position, usually the max mark on the bottle. Once the engine has stopped and the water pump ceases to move water round the system and the forced cooling effect of the radiator ceases, there is a temporary rise in the fluid level in the reservoir bottle. When all components of the cooling system are functioning correctly the level of fluid in the reservoir will rise and fall a small amount as pressure in the system fluctuates. The overflow tank of the coolant system isn't in fact an overflow tank - it's the expansion tank or coolant reservoir.
0 kommentar(er)
