My Mechanic is going crazy trying to figure out where this water is going. Not enough indicators point to a head gasket problem for him to pull it apart yet. Intermittently it's getting hot, mainly on short trips, and once cool, I find it's lost between 1 and 2 litres of water. If I put the heater on when I see the guage rising it cools it down immediately.
We've replaced all hoses, cap and thermostat. Tested for a radiator blockage. Can't see any problem with the water pump or fan. Fixed a small leak into the exhaust manifold...does anyone have any ideas?
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Check on top of thermostat housing, there could be a bleed screw on that. If not there locate two heater pipes that travel in the engine bay toward the dashboard. These lead to heater matrix inside the car. If you follow these with your hand the higher one may have like a plastic screw moulded into it. If its there loosen it ( but not right out. Cos you will drop it) also be extremely careful as this is very hot water! Leave it open until only water (coolant) comes out then tighten it up good and tight. Once might not be enough. It could also be somewhere on radiator body but high up. Low level bleed screws don't work as air always rises
These are tough to figure out sometimes. To name just a few, radiator hoses colapseing, see if there too soft when you squeeze them, head gasket, is the oil white looking that would indicate a head gasket are you losing any water in the radiator.. see if air could be getting around the radiator maybe a rubber seal is missing. Like i said tough to figure out, just keep looking..good luck
With what you describe sounds like the hot water is just heating up but not circulating and cooling correctly. Possible causes, airlock, faulty water pump, check fan belt tension, not broken etc, blockage in engine water way or collapsed hose. Are you losing water at all? Head gasket?
The heater core is the highest point in the cooling loop, so as you lose anti freeze the heater core is the first thing that dosen't get any hot water, and if you lose enough fluid the thermo couple will not be under water so that even though your engine is hot the gauge won't read correctly. get that leak into the cyl. fixed, it's going to give you trouble until you do.
When a Cadillac (Northstar) overheats, It will give the message to change the oil. If you run a Northstar and keep running it long enough it will start shutting off cylinders and stop the A/C compressor to help protect itself. In this condition I would check for a blown headgasket. Possibly your technican will find the problem. Could also be stuck thermostat, dirty radiator Thanks