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Water and radiators dont come on at the same time i have to turn the valvue with screwdriver and then water comes on or turn it again then radiatorscome on please help

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I assume this is hotwater heating.  Your problem is air in the line.  You may have something called an airscoop at the boiler...it is attached to a pipe at the top of the boiler and has a radiator vent unit on top.  Purge it and you may fix your issue...or not.
If you don't have one or the problem persists, you'll have to bleed all of the radiators...perhaps several times.  Be sure when you're doing this that you have water in the boiler before and after.  If you fire a dry boiler, this is a problem which will be very expensive.  You should see about 15 PSI or so of pressure indicating on the gauge.  If you see less than 10 or more than 25, you also have a feed valve issue.  These things do get dirty and they do clog.
If your vent valves at the radiators are more than 10 years old, get replacements.  Take a couple of pictures of them and go to the plumbing store.  Turn the water to the boiler off and quickly change each one.  Turn the water back on, bleed again and you will be fine.

Posted on Nov 15, 2008

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2 Answers

2001 Taurus No Heat


heat control valvue could be stuck closed not allowing water to pass through the heater core

Nov 25, 2012 | 2001 Ford Taurus

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There is brown sludge in radiator what is the cause do you think


The sludge is due to rust in the cooling system due to lack of maintinance, you will need to have the system flushed, you will need to remove the upper and lower hoses from the engine and run the water hose through the radiator first, you will need to do this a few times, then the next thing would be to remove the thermostant and run water throught the engine, the water will go in from the top, star the engine while water is flowing through the engine dont let engine run to long it will overheat, let it run for about 2 min at a time, then with the thermostat out install the housing and connect hoses, pour some cooling system cleaner into radiator and run engine for about 20 min, then flush out again, then refill and run again with water and then drain it out and fill with coolant, make sure that the coolant is mixed 50/50 coolant and water, you will notice that after it runs for a while it will turn brown again due to build up in radiator and engine, there is nothing you can do about that but atleast the coolant will be good and stop the internal gaskets and radiator from rusting out, you will what to do this again in 6 months to get it cleaner. good day. hope this helps.

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Having issues with a 2000 chevy impala overheating have changed the radiator and the thermostat fans seem to be working ok but overheats at idle in stop and go traffic, after a certain amount of time it...


YOU NEED BLEED COOLANT SYSTEM.CHECK COOLANT LEVEL IN RADIATOR.ADD MORE DEXCOOL UNTIL COOLANT LEVEL IS CLOSE TO RADIATOR SPOUT.CRANK ENGINE LET IDLE UNTIL TOP RADIATOR HOSE GET HOT.WATCH TEMPERATURE GAUGE.IF TEMPERATURE GAUGE START RISING TO HOT ZONE.TURN OFF ENGINE.LET COOL DOWN.USE LARGE RAG SLOWLY OPEN RADIATOR CAP A LITTLE AT A TIME UNTIL ALL PRESSURE RELIEVED.REMOVE RADIATOR CAP.ADD MORE COOLANT.CRANK CAR AGAIN LET IDLE UNTIL TOP RADIATOR GET HOT.KEEP EYE ON TEMP.GAUGE ALSO.WHEN TEMP.GAUGE STOP CLIMBING.YOUR COOLANT SYSTEM BLED.WHEN DONE LET CAR SET A WHILE CHECK COOLANT LEVEL.ALSO FIRST THING IN THE MORNING CHECK COOLANT LEVEL AGAIN.AND BESURE ADD COOLANT IN THE OVERFLOW JUG TO THE COLD MARK.DONT OVER FILL THE COOLANT RESERVOIR JUG.WORK SAFELY DONT GET SCALDED.

Feb 15, 2011 | 2000 Chevrolet Impala

1 Answer

I have replaced my radiator three times within the past 2 years on my 1996 Ford explorer. Each time the heater is turned on the radiators develop cracks. I had the last radiator changed together with the...


you may need to check/raise the quality of the parts you are buying. You dont say what engine you have? if the radiator cap is incorrect or bad, it may have too much pressure on the cooling system.

Dec 21, 2010 | 1996 Ford Explorer

2 Answers

How do i put coolant in my radiator


With the engine cold slowly remove the radiator cap and fill it to the top. Then check your reserve bottle. There are lines molded into your reserve bottle that tell you where to fill it to. You amy need a flashlight to see the lines. The bottle does not take much coolant...do not overfill it.

Nov 20, 2010 | 1997 Buick Skylark

2 Answers

91 accord lx overheating, leaking fluid but no smoke or steam? i have a 91 accord 180,000 miles awesome car but just now started over heating. no smoke or steam are coming out i don't know is that means...


the green colour will be antifreeze additive in the water, you should really trace the leak source as it is bound to continue or worsen without repair. You could try a product called CE-LIT which comes in little packets, looks like chopped up grass or silica - add to hot radiator and run at idle for several minutes, it is really good if you can find it where you live. I put a screwdriver thru the rad when fixing my number plate in the snow, huge leak ensued, ce-lit closed it within 5 minutes and I was able to drive off. Never leaked again either, if you cant find that one, get a similar one, but not the liquid leak sealers like barr's as they are ****.

Nov 15, 2009 | Honda Accord Cars & Trucks

1 Answer

Replacing fluids 0n 1996 300zx


radiator antifreeze: open drain **** on radiator and drain refill with water re plug and leave radiator cap off. start vehicle. watch when coolant drops or rises drastically as that is the thermostat opening. at that time re open drain **** and fill radiator with hose water at the same time. when water coming out is completely clear again turn vehicle off and drain radiator again. fill with antifreeze and water mix. 50/50

oil: jack up car, find oil plug, directly behind steering rack on oil pan. undo plug and drain oil into container. while oil is draining remove oil filter. wait for oil to drain completely then re-install drain plug and new oil filter(filled with oil) undo oil cap and pour in oil 4.5 quarts on n/a and 5 for turbo. tighten cap and your done.

brake system: dont attempt, use an experienced mechanic as the lines need to be bled in numerous places including inside the car from the abs module mounted behind the passenger seat.
easy brake system: individually bleed brakes while adding fluid until clear fluid comes out. (not efficient)

a/c: do not attempt unless you have an evac pump for ac systems.

clutch: same as easy brake except using the bleed valves at the slave cylinder and on passenger side fender well.

washer fluid: add fluid and squirt a little to make sure there is no air in the line

Jul 18, 2009 | 1996 Nissan 300ZX

2 Answers

Car will not heat up


Did you "bleed " the system when you filled it with coolant ? You have to put in a some coolant and water.1/2and 1/2 mixture, Make sure it is the right coolant. All color coolant works fine.Rune the vehicle for a while . Turn off the vehicle and let it cool. Turn the radiator cap and a hiss of air will come out. Use a Rag . Be careful not to burn yourself. The pour some more coolant and water . And repeat the process until radiator is full. Some cars have a bleeder valve that you turn counter clockwise with a screwdriver near the thermostat housing or near the radiator hose .

Jan 09, 2009 | 2001 Dodge Neon

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