Question about 2003 Honda Civic

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2004 Civic EX heat is intermittent. Can't really see coolant level but see some dried collant spaltters around where hose is coming out of the block. What could be problem?

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HEATER VALVE

Posted on Jan 14, 2011

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From the description you give it could be a loose clip,a blown hose,when fixed refill with neat antifreeze and vent topmost hose of air.....

Posted on Oct 05, 2010

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Its about my car its a Honda civic.


It could be a bad headgasket or a stuck thermostat.

Mar 24, 2015 | 2004 Honda Civic 1.7

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98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

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Yes it would overheat without circulation, but the coolant doesn't circulate through the overflow tank. That reservoir only gets coolant into it when the coolant gets hot and expands and pushes the radiator cap seal up to let coolant into the reservoir. When the vehicle cools down, the coolant contracts and the lower level in the radiator will siphon the coolant out of the reservoir back into the radiator. Coolant circulation is from the engine to the radiator and back into the engine...and also through the heater core.
You may have an air block in the heater core. Check by taking off the outlet hose at the firewall or at the engine and see if you have a slow steady stream of coolant, with the engine running and heater controls on high heat. If it was an air block, a steady stream should quickly start. If you get little or no flow, the core may be plugged and need flushing backward or replaced.

Nov 14, 2012 | Cars & Trucks

2 Answers

My temp gauge goes to the third line before fans come on and only the low fan comes on. I already replaced thermostat, engine coolant temp. sensor and radiator flush... any idea why high fans dont come on...


CHECK COOLANT FAN FUSES AND RELAYS. CHECK COOLANT LEVEL.MAKE SURE ITS NOT TOO LOW BECAUSE IF COOLANT TOO LOW . BY NO COOLANT AROUND OR COOLANT SENSOR NOT SUBMERGED IN COOLANT COOLING FANS WONT TURN ON.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER. CHECK FOR CLAPSE RADIATOR HOSES.CHECK RADIATOR HOSE AT WATER PUMP.IF HOSE LOOK CLAPSE REPLACE IT AND BLEED COOLANT SYSTEM.IF EVERY THING HAS BEEN DONE YOU NEED ENGINE BLOCK FLUSHED OUT.HEATER CORE ALSO COULD BE STOPPED UP.A VERY HIGH MILEAGE ENGINE WILL OVER HEAT.OLD ENGINE LOSES COMPRESSION AND HORSE POWER.PUTTING MORE LOAD ON THE OLD ENGINE WILL MAKE IT OVER HEAT.IF COOLANT LEVEL IS LOW.BLEED COOLANT SYSTEM.START THE ENGINE LET IT IDLE FEW MINUTES WATCH THE COOLANT TEMPERATURE GAUGE.WHEN TEMPERATURE START RISING.TURN OFF THE ENGINE LET IT SET FOR 20 MINUTES.TAKE A LARGE RAG PLACE OVER RADIATOR CAP ON COOLANT EXPANSION TANK SLOWLY OPEN RADIATOR CAP JUST A LITTLE TO RELEASE A LITTLE PRESSURE AT A TIME.DONT OPEN CAP RAPIDLY OR YOU WILL GET SCALDED.ONCE THE RADIATOR CAP REMOVED.IF COOLANT LOW ADD MORE COOLANT IN THE THE COOLANT EXPANSION UNTIL YOU GET TO THE COLD MARK.REPEAT THIS PROCEDURE START ENGINE LET IT RUN UNTIL TEMP GAUGE START CLIMBING A BIT DONT LET CAR RUN TO OVER HEAT JUST IDLE UNTIL TEMP JUST START TO RISE.THEN YOU TURN OFF ENGINE. WAIT 20 MINUTES.THEN USE LARGE RAG OPEN RADIATOR CAP LITTLE AT A TIME. DO THIS PROCEDURE UNTIL THE COOLANT IN THE EXPANSION TANK STOP DROPPING. THEN ALL THE AIR IS BLEED OUT THE COOLANT.WHEN COOLANT LEVEL STOP DROPPING, WHEN YOU DRIVE CAR AROUND.AND TURN OFF ENGINE.WHEN ENGINE OFF CAR SET FOR A WHILE KEEP CHECK ON THE COOLANT LEVEL IN COOLANT EXPANSION TANK. THE COOLANT LEVEL SHOULD BE AT THE COLD MARK IN THE EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK.IF NOT AIR WILL DRAW IN COOLANT SYSTEM. CAUSING ENGINE TO OVER HEAT.IF BLEEDING AIR OUT THE COOLANT SYSTEM DONT HELP AND COOLANT FANS DONT TURN ON YOU HAVE PCM PROBLEMS.

Apr 22, 2011 | 2004 Pontiac Grand Prix

2 Answers

My 2000 Honda Civic ex is not feeling well. It has begun to constantly overheat - The engine also seems to leak a bit of oil. I was told I need to replace the entire engine. Does this sound...


Who told you to replace the entire engine??? -An engine salesman? You should take advice with caution especially if the advisor stands to benefit. To fix overheating, try putting in a new thermostat. The new thermostat and gasket should cost you less than 20 bucks. Make sure your cooling fans cut on when the engine is warmed up. If not, then check the fuses and relays to the fans. Double check your coolant level. Your oil consumption is perfectly normal.

Nov 28, 2010 | 2000 Honda Civic

1 Answer

Drain collant system


You may not have drain plug but look on the drivers side of radiator at the bottom.If not you will have to take the bottom radiator hose off to drain.Run sme fresh water through it a few times,like three.Put in about 1 1/2 gallons of straight antifreeze,you will already have water in the block.You may have to bleed the air out.Look on top of the thermostat housing for bleed screw,and maby one of the metel heater lines,warm up and opem these just anough till only coolant comes out.If not warm up,cooldown a few times,checking coolant when its cool,may have to cycle a few times.DONT OVERHEAT THIS MOTOR,good luck

Jul 18, 2009 | 2004 Chevrolet Impala

1 Answer

Honda Civic LX 1995, replaced radiator, new radiator cap and removed thermostat, still getting boiling coolant to recovery tank above max mark level, then car starts overheating. when the car is cool the...


First check for the rad fan working. It could be the Fan relay, bad ground connection or coolant temp sensor (commands the fan relay). If not, check for little tiny bubbles in the coolant. Do this by running the vehicle with the rad cap off. Make sure there is no pressure in the cooling system first or you will get burned (squeeze rad hose, should be cool and easy to squeeze). Look into the top of the rad and watch for these tiny little bubbles. If they are present, you will need a head gasket.

Jul 22, 2008 | 1995 Honda Civic

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