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Subaru draws vacuum on cooling system after running hot

Runs hot and boils out bottom left of engine. then hoses collapse when cold. Cooling fans do come on after car gets warm.

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This sounds like a thermostat clog Open the system when cold run the engine and check for correct thermostat operation. As the car warms up you should see flow start in the radiator and feel the upper hose for fluid movement. It is most likely stuck and I would start buy replacing it. It is located where the upper hose go'es into the engine in the thermo housing, replace the gasket also or it will leak. Make sure the new one is in correctly, not upside down.

Check the lower radiator hose for failure.

Your cooling fans?? do above 1st and then see if they work but also check the fuse.

Mike

Posted on Dec 24, 2018

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  • Contributor
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It sounds like you over heated the engine and have damaged the head gasket. do not drive and have you car looked at more in detail to confirm the head gasket is indeed the problem

Posted on Dec 24, 2018

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6ya6ya
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Posted on Jan 02, 2017

keemo68
  • 1263 Answers

SOURCE: 2002 V.W. Jetta 2.0 liter overheat

turn your heater on to max heat and high fan. then see if you can feel the hoses on the firewall for heat they should be hot. make sure that the fan unit on the radiatoris working if the upper radiator hose is hot the fans should be running if they are not that means that either the relay is bad the thermo sensor is bad or the fan unit is shot... please rate the solution..........thanks

Posted on Sep 24, 2008

lancer721
  • 229 Answers

SOURCE: 1998 jeep grand cherokee cooling problem

Your thermostat is stuck closed. It needs to be changed right away. By the way the operating temp on that motor is 160 degrees so you are running hot you have just been lucky so far. Good Luck

Posted on Dec 01, 2008

  • 9 Answers

SOURCE: Running Hot

Sounds like the water pump.Check if you see coolant or coolant residue behind the water pump pulley.

Posted on Dec 06, 2008

csmock132
  • 4669 Answers

SOURCE: Have a 1958 Chevy 348 / 409 engine that runs hot.

Waterpump? The blades can erode away from age and old antifreeze. Or not enough airflow thru the radiator. Try blowing through the fins with an airhose to see if it is dirty or plugged.

Posted on Aug 31, 2009

GasparMacari
  • 166 Answers

SOURCE: radiator cool, engine temp = 140

sounds like your radiator is clogged, it will bring problems to you soon, you need to flush it really good, i dont think you need to replace it but it sounds like a typical clogged radiator, have it flushed, it you cant ur gonna need to replace it soon, if you keep running that car it might lead you to a temp problem while runing and u might end up hurting your engine...
u also need to check if your thermostat is working properly. go on google and look for the procedure, ur gonna have to take it off and do a test with hot water and a thermometer and see if its working properly.
hope this helps.
have fun!

Posted on Oct 31, 2009

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2 Answers

Over heating we have put in new thermostat new clutch fan water pump going up hills gets hot going down hill cool down


if there isnt any leak in the cooling system the fan clutch is changed and the fan along wit the thermostat dat mean u can probly have a clogged radiator with poor cooling system circulation or u might have to take it to a repair shop to check if the head gasket is blown

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2 possible things. 1st(cheapest) you have air in cooling system. Need to burp it. 2nd(expensive) you may have blown head gasket. I tend to think air is in cooling system and your level is low.

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This is either a cooling system fault which could be, thermostat, radiator or fan thermo switch, check that both top and bottom hoses are hot, if one is cold the thermostat isn't opening, check to make sure the radiator fans are turning on. If the thermostat is opening and the fans are turning on you need to take the car to get the cooling system pressure tested as you may have a leaking head gasket.

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The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

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1 Answer

Overheating water comeing out of bottol


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.CHECK MECHANICAL COOLING FAN.SHOULD HAVE RESISTANCE WHEN TURN WITH HAND.IF FREEWHEELS FAN CLUTCH NEED TO BE REPLACED.CHECK TO MAKE SURE AUXILIARY ELECTRIC COOLING FAN RUNNING HOT WIRE COOLING FAN IF FAN RUNS.YOU HAVE FAULTY THERMO SWITCH LOCATED AT THE BOTTOM OF RADIATOR ON THE LEFT HAND SIDE ON 4 CYLINDER ENGINE FOR V6 ENGINE THERMO SWITCH LOCATED ON THE LOWER RADIATOR HOSE ON THE RIGHT HAND SIDE OF THE ENGINE COMPARTMENT. CHECK FOR BLOWN COOLANT FAN FUSE OR FAULTY RELAY.IF THE AUXILIARY ELECTRIC FAN DONT RUN WHEN HOT WIRED THE ELECTRIC FAN FAULTY.

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Non Contact Infrared Thermometer With Laser Targeting

Could be a bad temp gauge . Is the coolant surging inside the cooling system ? Does it have a radiator cap ? Have you replaced it ?

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I own a 1990 Chevy Lumina car. I had a new radiator put in it. Then I replaced the jhoses, water pump and thermastat. After refilling the system, I ran the motor for 7-8 minutes idling, then I ran it at...


It could be the fan temp. switch but it shouldn't have been boiling in the overflow tank. I'd recommend doing a compression test to see if you have a blown head gasket. If it's a blown head gasket, the compressed air/fuel mix being force into the cooling system could well look like boiling in the over flow tank.

Jun 26, 2010 | 1990 Chevrolet Lumina

2 Answers

Over heats after 10 minutes running. I have taken rad out and ran water through it, put it back in and when it is running the bottom hose collapses.


Is the cooling fan running? If so, drain the radiator with the heater control set to hot. Install a new thermostat, and fill the system with a 50/50 mix of antifreeze and distilled water. Bleed all air from the system by using bleeder screws if equipped, and by starting the engine with the radiator cap off radiator full. Watch for escaping air bubbles and keep the radiator full. When you see no more air escaping put the cap back on. If the fan is not running then that is your problem. Turn the A/C on and the fan should run continuously. If it does not the fan motor is more than likely bad. Check the fuse for the fan. If it is good, Apply 12 volts directly to the fan motor to check it. If it runs then replace the thermal relay.

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