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I have recently acquired a subaru legacy 2 litre petrol, n reg, when i am stationery the temperature gauge rises and the heater blows warm, but as soon as i start moving it drops to cold and the heater does now work
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You have to bleed the air out of the system, there is a small brass valve( maybe 2 valves in the front of the engine compartment ) that must be opened to allow the air to escape. Engine must be running while bleeding the coolant
replace the failing drive belt and make sure it is tensioned correctly
the noise is from a slipping belt and the battery problem is because the alternator is not charging because of the drive belt problem
Sounds that you are low on coolant so low that the coolant sensor is no longer immersed in it If the coolant sensor is prevented from working, due to low levels of coolant, then the engine radiator cooling fan will not be started and overheating will result. The gurgling you hear is due to air in the system.
When the engine is cold remove the coolant reservoir cap. Set the interior heater to max temperature. Top up the reservoir to the maximum limit with water/antifreeze mix (2:1 is usual). Start the the engine. Be prepared to add more coolant mix as air is cleared from the system. When the top hose from the engine to the radiator gets warm give it plenty of squeezing to help shift any air pockets. The fan should also start at about this time. Make sure that the interior heater is blowing hot air. When the gurgling has stopped and no more coolant needs to be added to stay at the max level then replace the reservoir cap and secure it firmly. Allow the engine to reach running temperature. Check all hoses, junctions, gaskets water pump seal etc for any signs of leaks as it would be good to detect any cause for the previous loss of coolant.
if there are no leaks then they have problems with head gaskets blowing compression into coolant when cold remove rad cap fill with coolant run engine then rev up engine look for bubbles in coolant if so then replace head gaskets
cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.
As long as your gauge is still moving up, there's no real problem. You have heat coming from the heater. It's only a problem if it's getting too hot. What's going on is that you don't let the vehicle run long enough, and it's so cold outside that the engine stays cold. It raises in temp when your stopped because there's no airflow through the radiator. The thermostat just heats up the engine block, and won't change the reading on the gauge. When this goes bad your car will overheat in just a few miles.
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