Make sure that you are following the correct coolant filling procedure for a bleeding all of the air out of the system. This is called the burping and will allow the coolant to circulate throughout the system
Water/coolant has to be circulating through the hoses and the engine block for the radiator to radiate. The radiator cap must be working in order to properly pressurize the system. an incorrect fuel mixture could cause the engine to run hotter than necessary. The temperature sensor or indicator could be out of calibration or defective. Low or no oil, low or no oil pressure could cause overheating. Blown head gasket could allow exhaust gas to enter the cooling system. Crack in the head, or engine block could do the same thing. Build up of rust and corrosion could be interfering with water circulation through the block and head. Hope that helps.
Hi If heater blowing cold air that means you needs to bleed the air from cooling system open the bleeder screw and hold the rpm for 3 minutes at 3000 rpm and turn the heat on as soon air goes out from system your both broplems gonna fixed by self
You m?y have a blown head gasket letting exaust into the cooling system. The pump cannot push exaust. Try a liquid head gasket sealer before replacing gasket. But first open the radiator cap and start the engine. Watch for the coolant to bubble. Top engine and add coolant or water. Some times after doing work on a cooling system you may get air in the system and need to *burp* the systems.
Testimonial: "I did have a blown head gasket...took it to a shop had the head gasket fixed drove the car for a week or so and it started overheating again! Now i have a new water pump to replace the one that has a small hole leak in it! Should the mechanic put it on or me?this over heating has been a on going problem do bmw have this problem in the older models?"
SOURCE: My 97 BMW Z3 keeps overheating
I too had similar problem when replacing the thermostat on my Z3. My advice is top up with more coolant and check the level.
SOURCE: 97 mustang overheating and blowing cold air
Get a compression check to find out if you have a bad head gasket, I have a 96 with the 3.8L that had the same problems at first. then it started to blow out antifreeze thru the expansion tank, the head gasket finally blew the rest of the way going down the highway
SOURCE: Overheating 93 Subaru Legacy
water pump could be bad again. if the seal is out lets air in around pump propeller and it won't move water and it over heats. its a lot of work but you can fix it your self
SOURCE: we have an audi a4 2.6cc , the heater only blows
sounds like the thermostat is not functioning correctly? either that or not in at all? thus making the water which would normally warm up quickly, warm up extremely slowly and on really cold days not at all? with a 2.6 engine your car shoudl warm up in record time?
SOURCE: car overheating, blows cold air out vents, changed
A couple of things to check because as you describe your symptoms you actually have 2 problems
1. No heat from vents.
Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)
As for the overheating engine after all of the work you have done.. Perform this simple test.
1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.
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