Question about Mazda 626

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Car over heats when in stop and go traffic and cools down when i start moving

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  • torresema Aug 09, 2008

    My car air condition doesn't work when driving in city traffic but cools really well on the highway. It appears that it has too much pressure, according to my brother. He let out all the freon and apparently it had too much pressure, and then put two cans but the problem persists. He has bypassed the high pressure (?) valve but it hasn't helped much. He says is going to be a process of elimination and we are trying to find a copy of the air conditioning system schematics but since it costs money we are trying to get them for free at the library by using ALLDATA but the internet at the library is so slow I havent had time to get to that section successfully yet.



    Ema

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It sounds like the electric fan is not running. Can you hear it? It should also run when A/C is on.

Posted on Aug 06, 2008

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Toyota Corolla 1995. Quality of air conditioner reduced when stopped (traffic light) or moving at slow speed (condenced city traffic) No problem on the highway. Checked freon gas and fan. Understand that...


Normal, the ac heat exchanger condenser need air moving across the fins to remove the heat. While moving in town the condenser isn't remove the meat that is building up the it's aluminum fins. Even though the vehicle uses an electric fan. The fan is used to cool the engine temperature. If you Toyota is equip-ed with automatic transmission. The electric fan will need to pull enough air to cool the engine temperature, automatic transmission fluid, air conditioner condenser, and maybe power steering condenser to cool the power steering fluid. Later model of vehicles/trucks are using different refrigerants instead R134A in which you Toyota uses.

The simples way to explain is the ac remove heat from inside your Toyota and this heat is removed by the refrigerants inside your ac in the car. To cool the refrigerant this coolant is removed to the heat exchanger condenser located in front of the engine radiator. So, while moving at 60mph there is enough air flow through the radiator, ac head condenser, and other aluminum heat exchangers. GB...stewbison

Sep 12, 2011 | 1995 Toyota Corolla

1 Answer

I have a 2001 Chevy Impala. It's started overheating after sitting in one stop for a long time. As long as your moving the car is fine but as soon as your in traffic or stopping the temp rises. It...


Check to make sure the cooling fan is kicking on it is mounted to the back of the radiator once the car gets up to temp it should kick on to coll the radiator when you are sitting in traffic on some cars if you turn the ac on the computer will automatically switch the cooling fan on

Jun 23, 2011 | 2001 Chevrolet Impala

2 Answers

The ac starts out cold and stays that way on hwy driving but starts blowing warm air in stop and go traffic. why?


Either clutch coil is heating up and letting go Or one of the sensors is defective. Or there is a restriction somewhere in the line (open up hood and look for frost on a/c lines.)

Sep 21, 2010 | 2001 Ford Taurus

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

5 Answers

It faintly smelled like coolant inside the car


Usually when the windows are closed and the smell of coolant gets inside the car means the heater core has a leak. The leak can be the very tiniest and the smell will be very noticable to anyone. If the windshieild fogs up the leak is getting larger.

Check the radiator cap ton see if its holding the correct pressure. That will cause the temperature to fluxuate as well.

Mar 26, 2010 | 1999 Cadillac DeVille

1 Answer

1999 Dodge Caravan overheating only while idling


this would be your cooling fan module located by your air filter mounted on the core support.

Apr 21, 2009 | 1999 Dodge Caravan

1 Answer

2004 xterra temp rises when stopped, goes back down when moving


sounds to me like the thermostat may be stuck. i would check the coolant, fan, and belts.

Dec 13, 2008 | 2005 Nissan Xterra

2 Answers

Weird humming noise & over heating while sitting in traffic


The humming is the noise the coolant makes when the car overheats and forces open the relief valve in the radiator cap and flows through the small hose to the recovery bottle., it you had all this work this done only 2 things can cause the issue, one is a problem with the cooling fan, the other is a blown head gasket, which I suspect is the problem, before you flushed the system was the coolant rusted?

Nov 18, 2008 | 1996 Ford Escort 4 Door

1 Answer

Over heating when idle in traffic


if ac dont work idleling it start to work when you move our fan is not coming on because when you activate the ac compressor kick in and fan should come on if it start to be cold only when you drive the force air cool the condensor ac work temp goes down HOPE IT HELP FIXYA OUR POST THANKS . PIERRE

Jul 09, 2008 | 2004 Honda Accord

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