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Half rad hot half cold

Lots of air

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Follow the hoses from the radiator until you find what looks like a little plastic screw. This is an air bleed. Top up the water and run the engine while keeping the screw open until water comes out, then close it.

Posted on Nov 02, 2013

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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

  • 3 Answers

SOURCE: 04 civic heater blows cold air at idle

you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

Posted on Jan 18, 2009

theroadis
  • 81 Answers

SOURCE: coolant problem

Sounds like you might have an air pocket in the cooling system. This can develop, usually after a service, where the cooling system has to be opened to replace a water pump, thermostat, or other reason. When refilled, the air displaced by coolant has to go somewhere. In many cases, youll find that air is trapped in the highest place it can go...above the level of the radiator cap or overflow bottle. This can be a portion of the upper rad. hose, a heater hose, or a coolant line running thru various parts of the intake/throttle body area. What I do after topping up the system, is let the engine warm to normal op. temp./ W radiator cap still off. When upper hose becomes hot, you know thermostat is open. Now, if a bleeding device is not present, back off a hose clamp at the highest point in the system. Take a pair of pliers and twist the hose just enough to break the seal. You should see steam or drops escaping from your "breach". Once the steam stops and becomes all coolant, you have likely bled all air from the system. Top up radiator and coolant bottle to proper mark and close the system. (tighten your hose clamp) Check for leaks. Keep an eye on your system for a day or two, to insure no leaks are present.

Road

Caution! As with any task that involves opening the cooling system...Coolant and water can become very hot. Hot water and steam can be very dangerous. If you dont feel qualified to perform this task, let a mechanic do it!

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Posted on Feb 04, 2009

RJones1125
  • 373 Answers

SOURCE: i think i have a air lock in the water sytem on my bmw 520i,

time to buy a new radiator
yours is clogged

Posted on Feb 22, 2009

  • 401 Answers

SOURCE: 2006 Pontiac Torrent heater blowing cold air

hi
check the heater hoses and if both are hot then the mode door is broken
i have replaced 2 in the torrents(not a nice job)

Posted on Jun 21, 2009

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1 Answer

Do i need head gasket


there are about 8 tests to prove this. and lots of signs.
1: fails compression test.
2: water in engine oil.
3: carbon and oil floating top of RAD filler hole. cap off dead cold
4: constant need for adding AF.
5: steam out tail pipe end, hot engine, fully hot.
6:rad leak down tester fails.
7:the rad blue green tester fails. proves exhaust gasses in RAD.
8: air (seemingly) blasting in to side expansion tank, (combustion gasses actual)
9: engine over heat. and pings. and loss of power.

ill stop here, there are more.

Jul 07, 2014 | 2002 Dodge Ram Pickup 1500

1 Answer

Why is the coolant overflowing when the temp guage gets half way?


well the tank must never be full, when engine is cold
was it? (read operators guide to see methods)
water expands hot, and the tank captures this expansion
that is normal.
what does "until its all gone", mean, what is IT?
there are lots of tests.
the first one, is,
IS the engine overheating,?
try a new rad cap, they are dirt cheap.
and, is the oil or carbon in the RAD neck, cap off , cold engine>?
is there water in the engine oil, milky dip stick end?
same with A/T trans? milk, or pink/red ATF.
is there steam going out the tip of the exhaust pipe on a fully hot engine>? yes/no?
is air and water exploding in to the side expansion tank.?

cold engine
remove rad cap'
fill rad with 50% AF.
new cap back on.
put 50% AF 1/2 way up in to expansion tank(its marked clearly)
start engine , does it overflow now>?

Jul 04, 2014 | Saturn SL1 Cars & Trucks

1 Answer

Thermostat problems


your easy, that is caused by AIR Pocket in the engine block
the gauge can not read, air temps so if air is below the engine
coolant thermostat the ECT reads hot then air (cold ) repeats
you lost coolant and the number one reason for that is trusting
the silly side tank, (they fail easy)
never do that, on the next cold morning , dead cold
you take off the RAD cap. look down the neck, is it full of green
AF? id bet you its not.
the cab heater will never work with no engine heat, ever. so ......
never do the above on any hot engine.
also the thermostat might be bad and the coolant overheated
and blew out, so get a new STAT.
the flush the system, and refill with 50% AF.
or worse. lots of ways to overheat.... ask.
the side bottle only works, (called the expansion tank)
if never overheated
and the tube in side is not dropped off
and you never let it go dry, ever.

those facts and others are why we check the RAD directly cold.


Jan 16, 2014 | Jeep Compass Cars & Trucks

1 Answer

Running hot think it is air locked how do you bleed air from it


Loosen the cap on the rad and run the engine up to operating temperature. Make sure the rad is full, and go for a short drive around the block to warm up the engine. Make sure the heater is turned on high and the fan running full. There will likely be some burping and gurgling going on as the air gets forced out. Keep checking and topping up the rad. Eventually it will stop.You should run it for acouple days with the cap loose to be sure all the air is out. After that, make sure the rad is full, close the cap and top up the overflow bucket.

Nov 23, 2013 | Toyota Camry Cars & Trucks

1 Answer

I have a 99 ford expedition eddie bauer. The heater works great sometimes and other times blows cold. If you turn it off and wait a few seconds and start it again it will work. Truck never over heats or...


You probably have air in the cooling system. These vehicles are sort of hard to bleed it out. I would recommend taking it to a dealership. Or you could take the rad cap off and run it but you will need a large funnel, one that is tight when going into the fill hole on the rad. Warm engine up, the fluid will rise a lot and this is normal. Once the engine is at operating temperature and the thermostat has opened up (grab upper rad hose it will be hot) rev it to 2500 rpm for about 10 seconds then release the gas pedal. This will help get the air out you will see bubbles in the funnel. Do that a few times (4 or 5) then leave it idle for a bit, put the hot air on through the vents it should stay hot if it is then you can put the rad cap back on if it doesn't stay hot you still have air in the system. I do it somewhat like this except I built a special rad cap specifically for the explorers.

Jan 05, 2011 | Ford Expedition Cars & Trucks

2 Answers

I replaced the top radiator hose, and added coolant it still runs hot and left side air is cold, right side air is hot


Sounds like 2 different issues. Change the thermostat and then check the heater core valve for the left right issue.

Nov 09, 2009 | 2000 Buick Century

1 Answer

2001 s-10 heater blows cold air, then hot air, then cold air, then hot air at 5 minutes intervals.


May want to start with seeing how much coolant you have in the system. Sounds to me like you are low. Make sure to check it while its cold. Removing the rad cap while hot is a bad Idea, may get burn!

Oct 14, 2009 | Chevrolet S 10 Cars & Trucks

2 Answers

2000 Nissan Xterra - Air conditioning problem


Email me on this one.
dane_774@yahoo.com

Jul 14, 2009 | 2000 Nissan Xterra

2 Answers

I think i have a air lock in the rad of my bmw520i


sounds more like a possible heater core issue the heater core is what heats your car by the fan blowing over it and through tour vents ! find the 2 hoses that come out of your firewall on the back side of the engine compartment . run vehicle for 10 to 15 min and see if both of the hoses are hot if one is hot and one is cold heater core is plugged. if both hot have a diff problem. start hear first !!

Feb 21, 2009 | 2001 BMW 5 Series

1 Answer

04 civic heater blows cold air at idle


you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

Jan 18, 2009 | 2004 Honda Civic

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