Hi, I have a 1995 Astro van that runs great, but the problem I have is there's no heat, I replaced the heater control valve, the anti freeze flows into the heater core but only drips out. Do I need to replace my heater core, or could I flush it out myself.The heater core does not leak.
Mike from Philadelphia
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Re: Heater hose, 95 Astro
SOUNDS AS THOUGH THE HEATER CORE IS PLUGGED. TRY BACK FLUSHING IT AGAIN. IF YOU STILL GET NO FLOW IT IS MORE THAN LIKELY PLUGGED AND WILL NEED TO BE REPLACED. THE TUBES ARE VERY SMALL AND PLUG EASILY WITH RUST.
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The best way would be to turn the heat and fan all the way up, let it run for a bit and feel the 2 hoses going into the heater core. One will likely be warmer than the other, the warmer one is the inlet and the cooler one is the outlet. Mark them with tape and let the engine cool and then remove both hoses, install a section of bulk hose and clamp it on the outlet of the heater core and the other end to a garden hose and turn it on. Once the water runs clear, you're all set.
1995 huh? Time to check where your heater hoses connect to the engine block. These are known to clog themselves with rust and corrosion preventing coolent to flow through your heater core. Does your heater hoses get hot? If not, your clogged mate!
One line supplies vacuum from the intake manifold to the control panel. The other line runs back from the control panel to the heater water control valve, which is along the heater hose. The vacuum port on the valve is at the top of the cylindrical actuator.
Feel your heater hoses. If both are hot, the core is circulating. If only one is hot-poor or no circulation of the core. If the heater core is circulating, the temperature blend door may not be working to let blower air pass across the heater core, and into the vents. If vacuum operated, watch the vacuum valves as you move heater controls-you may spot the problem. Check that the vacuum line from the engine to the control switch is working and still connected. If not operated by vacuum, the controls may have cables to the heater case or may be electrically operated. You'll just have to scope it out. Good luck.
repeat backflush procedure to replicate fix.....use a radiator cleaner to clear blockages with all heater switches open so it circulates cleaner through heater plumbing as well...is it global to all settings ..defrost/ main heat ..floor heat etc?
The aerostar has a vacuum operated watervalve in the heater tubing.the valve is located on the
passenger side inner fender behind the aircleaner.with someone operating the controls inside the van
you can check to see if you get vaccum by removing the tiny hose that goes to the water valve
and checking for suction as you in the van person operates the heater conthttp://www.fixya.com/PostAnswer.aspx?thid=1323651&prdid=696348rols. If you have no
vaccum there is a break in the hose between the intake manifold and the valve. If you do get
vaccum check to see if the valve changes position from vaccum on to vaccum off. you can see
this motion on the small lever on the side of the valve. If the valve lever doesn't move you can
move it manually to allow the water to flow through the heater core. if the valve won't move manually
there is an obstruction in the valve. If it does move manually the vaccum diaphragm is gone.
replace the valve. if it moves to the manual open position you can hold it open with a tywrap.
before you get to this point you should first check to see that there is enough coolant in the
radiator. If you still have no heat you can check the coolant flow through the heater core. to do
this remove both heater hoses from the valve and pump water from a hose into one of the hoses
water should flow from the other hose. If it doesn't the heater core is blocked. The rear heater
operates the same way with the watervalve under the van just behind the drivers seat.