Question about Cooling System for Ford E250

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Intermittent heat. Pressure backs up to overflow

2002 f 250 van.

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Bad thermostate

Posted on Sep 04, 2014

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Posted on Jan 02, 2017

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1999 chevy express van.I have two hoses that run off of my reserve tank one of the goes to the radiator. and another hose that looks like it goes on the acumlator


From the reserve tank, one hose should go to the radiator and the other should be for overflow. Sometimes that one goes to an accumulator, sometimes its left dangling cause its just there to drain any excess fluid from expansion in a hot system. Depends on the vehicle. If its in an enclosed system or plugged you would get an excess of back pressure which would further heat up the coolant and inhibit flow. Just leave it there. If it pukes coolant when hot then its doing its job. Don't overflow your reserve tank.

Apr 26, 2016 | Cars & Trucks

1 Answer

Several weeks ago I had a hose burst in the cooling system -- towards the rear of the engine of my 1997 Safari van. Afterwards I started hearing like the sound of trickling water coming from the heater...


It sounds like you still have a leak somewhere, maybe it's a hose clamp that wasn't tightened or another leak. You should check the coolant level in the radiator, not the overflow bottle. If the system has a leak it won't create a vacunm to draw in the coolant from the overflow, the radiator could be very low. The sound you were hearing was air bubbles in the heater corem maybe the coolant wasn't topped off.. If the core was leaking there would be coolant dripping on the passenger's side floor.

Mar 30, 2011 | 1997 GMC Safari

1 Answer

2001 Town and Country. Coolant backing up into overflow bottle, which is causing the overall level to drop. As a result, I have no heat in the passenger compartment. Get heat when system refilled. At a...


If everything is working correctly; thermostat, heater core, water pump, head gaskets, etc. Then that leaves the radiator cap, the overflow hose or the overflow tank as being the problem.

As the engine heats up the coolant expands flowing into the overflow tank. As the engine cools the coolant is drawn back into the engine from the overflow tank. but this depends on the vacuum created by the cooling liquid. the radiator cap has a "valve" that lets pressure out and vacuum in. If it fails then you may not achieve a good vacuum. The hose that connects to the over flow tank must be non leaking as well; if it leaked then coolant would not be drawn back into the engine, only air would be sucked in. And lastly the coolant has to be drawn from the bottom of the overflow tank. again we dont want to be sucking air.

Some engines require a vent screw to be opened when bleeding the air out of the engine.

Jan 14, 2011 | 2001 Chrysler Town & Country

1 Answer

My van is heating up and the heater is blowing cold air.


check for low coolant in radiator first then overflow,start it make sure you let it run until thermost opens then fill radiator put cap on,then fill overflow,check for leaks

Nov 29, 2010 | 2007 Dodge Grand Caravan SXT Minivan

1 Answer

Antifreeze/water leaking . puddle underneath van already got new thermostat, radiator is full overflow box full. can't see where leak is coming from. either from below or above view is blocked by other...


May not be either. Does the van run hot? If it doesn't then the coolant when it is heated is going to the overflow reservoir and if that fills up then out the overflow line to the driveway or the garage floor but everything is O.K.

Sep 13, 2010 | 2000 Dodge Caravan

1 Answer

When Iturned off my van collant started coming out of the overflow


you should have a coolant reservoir that the overflow hose runs to, the vehicle pulls coolant out of the reservoir as needed, as well as pushes it back in, could also be a stuck thermostat or a weak radiator cap, if you replace the cap make sure you replace it with one of the same pressure rating.

May 28, 2010 | 1999 Pontiac Montana

1 Answer

2002 pontiac montana van ''service engine soon'' light


Diagnostic Aids
  • Low system airflow can cause an intermittent complaint. Inspect for the following conditions:
    • Any restriction in the exhaust system that may produce back pressure
    • Pinched, kinked, restricted, or leaking pipes, hoses, or fittings
    • A restricted pump inlet hose, duct, or filter
    • Pinched, kinked, restricted, or leaking vacuum lines
    • Heat damage
  • A short to voltage in the pump relay control circuit can result in the AIR pump running continuously with the ignition OFF by back-feeding to ground. This will eventually result in pump failure.
  • An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.
  • Notice Do not operate the AIR pump for more than 60 seconds. Continuous operation of the AIR pump in excess of 60 seconds will damage the AIR pump.

    If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records data can be useful in determining when the DTC was last set. Also refer to Intermittent Conditions

Oct 09, 2009 | 2002 Pontiac Montana

1 Answer

Gas Leak via Overflow


The usual culprit is a blocked vent tube. Verify it's open. The usual indicator is either a pressure release when you open the gas cap, or a vacuum "sucking" noise when opening it first thing in the morning. On a carb equipped bike, the carb overflow lines will leak, but in a fuel injected bike like yours, it'll be out the overflow vent. The next time it begins leaking, open the gas cap. It should stop immediately as pressure inside is released. Good luck.

Nov 20, 2008 | 2005 Ducati Monster 1000S

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