Question about 1995 Honda Accord

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Intermittant over heating at highway speed 4cyl. automatic, getting circulation when radiator cap is open while warming up. Radiator is full.

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Try a new thermostat in the engine first and check the rad fins anr clean and not full of dead leaves or road dirt

Posted on Aug 28, 2010

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My 1991 Chevy Cavalier has just turned 100, 500 miles and has started acting up, went to ck my antifreeze and when i took the radiator cap off ( car is started) the antifreeze in the car was just sitting...


It does not circulate until the engine is warm. At that point the thermostat(cooling valve) opens allowing the coolant , from the radiator ,to circulate into the engine. Before that point only the coolant already in the engine circulates, inside the engine alone. .

Nov 26, 2014 | Cars & Trucks

1 Answer

In cold weather heater will not blow warm air unless at idle stopped. when at highway speed blows cold air


check and make sure the radiator is full of antifreeze take off the radiator cap and top off the radiator then take your hand and cover the hole where the cap goes and squeeze the top radiator hose a few times to help it go down that way if there is a air pocket somewhere it will help push it out when you thank your done top off again and replace the cap and try

Jan 27, 2014 | 2003 Ford Focus

2 Answers

Radiator fan not working unless ect switch is unplugged, also lower rad hose cool to the touch


Hi
Do you have a bleed valve on or around radiator / radiator pipes.
if yes the undo the valve and leave the car running till it bleed.
once its bleed, you will have full circulation of the water and both pipes will heat up also the fan will come on.

If no bleed valve then undo the water bottle or metal cap.
start the car up and leave it running till the fan kicks in. it will only kick in when the system is bled and no more air in the system.
Thanks

Aug 12, 2017 | 1997 Toyota Corolla

1 Answer

03 Chrysler Voyager heat not warming up. Heater core good, new water pump, not leaking coolant, A/C works fine. Any suggestions?


Perhaps the thermostat is stuck open. That would cause the water to circulate constantly and not trapping it in the block long enough to heat up. While your vehicle is cold, remove the radiator cap. Have someone start the car. You should not see water circulation thru the radiator. That should only happen when the hot water in your block is exchanged with the cooler water in the radiator.

Oct 05, 2011 | 2003 Chrysler Voyager

2 Answers

Im not getting any heat? good thermostat,rad.cap


Does the temp gauge read normal. You might have to backflush the heater core.

Feb 14, 2011 | 2001 Chevrolet Silverado 1500

2 Answers

Engine overheating, 2000 deville


The problem is that more heat is entering the water than is being extracted by the radiator.

But there can be a lot of causes for that. If you have a head gasket leak, it can introduce hot gasses into the water, increasing the heat load while raising the pressure in the cooling system. That in turn can push water out of the cooling system, and into the recovery reservoir, where it can't help with the cooling of the engine.

If the fins of the radiator are blocked or folded over, that part of the radiator will not contribute much to the cooling.

If the internal water passages of the radiator are blocked, the area of the radiator is effectively reduced.

A worn out bottom radiator hose can collapse from the suction of the water pump, blocking the water flow.

If the fuel mixture is too lean (not enough fuel in the given volume of air) the engine will generate quite a bit more heat, possibly overwhelming the system.

When the engine is cold, the thermostat (a valve in the hose where water exits the engine to go to the radiator) is closed. This prevents water from going to the radiator, and that in turn prevents water coming from the radiator to the engine.

Water instead leaves the engine through the heater hose near the upper radiator hose, and circulates right back to the inlet of the water pump. So the water circulated through the engine, but it has no way to shed any heat it picks up. This speeds up the warm-up process.

The water circulating this way passes by the back of the thermostat, causing the thermostat to warm up along with the water.

When the thermostat reaches its opening temperature, it starts to open, allowing some water to go out of the upper hose to the radiator, and therefore some water from the radiator to enter the engine.

Right away, the water in the engine falls below the opening temperature of the thermostat and it closes.

The newly cooled water gets warmed by the engine, raising it to the opening temperature of the thermostat, and the whole process begins again. But this time, the water coming from the radiator is just a little warmer.

Eventually, the thermostat will stay at a partially opened position where the cooling by the radiator just matches the necessary heat loss through the radiator.

If there is not enough water, the surface area of the radiator is effectively less.
If the radiator is blocked, or the fan is not working properly, the surface area of the radiator is effectively less.

If the thermostat doesn't open properly, the radiator is not sufficiently utilized.

If too much heat is generated by the engine, it can over heat (heavy load at low speed will make a lot of heat without spinning the water pump fast enough, for instance).

These are a few preliminary tests to see what's going on. With a stone cold engine, start it and let it idle. The heater hose leaving the thermostat area should begin to heat up but not the upper radiator hose.

Once the heater hose starts to become uncomfortably hot, the upper radiator hose should start to warm up, slowly at first.

If the heater hose does not heat up, there might be insufficient flow throw that part of the system.

There is a quick check a shop can perform to see if you have exhaust in the water. There is a syringe they can use to draw the vapor in the radiator through a sensing liquid. If it changes color, you have a head gasket leak.

The radiator cap only need to be replaced if it is letting the coolant move into the reservoir improperly. If you coolant level remains fine, that is probably not a problem.

Jun 20, 2010 | 2001 Cadillac DeVille

1 Answer

95 subaru warms up fine but when you hit the highway temp goes back to cold until you slow down again --radiator is full


Most likely your thermostat is stuck open. When you are at highway speed the air flowing over the radiator is over-cooling the coolant. Normally when it's cold outside the thermostat will close, reducing flow through the radiator. It's an easy fix, and not too expensive.

Dec 14, 2009 | 1995 Subaru Legacy

2 Answers

Running hot all water going straight to overflow tank


Check the thermostat. If the upper hose does not feel very hot to the touch when the car is warmed up already, this indicates the thermostat is not opening, and therefore the water cannot circulate causing the overheating problem. Second possiblity is the radiator fan. If the car tends to overheat only on city driving it is a the radiator fan not coming on. This is either due to a bad radiator fan, blown fuse,bad relay, or a bad temperature sensor or temperature switch. If the car tends to overheat at highway speed, then it is the radiator being clogged up, and not letting enough water circulation when demand is at its highest which is high engine rpm.

Nov 11, 2009 | 2003 Dodge Neon

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