Question about 1991 Mazda 626

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Car heating up and radiator cant hold water

The car is over heating and the rpms goes up and down while in parking as well as it cant hold the water. whats wrong?

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You have a leak somewhere, and a small one it soulds like, also with the runniong rough, it sounds like you might ave head gaskets going out, i would get a compression check on the cylenders, check the oil and water for any cross mixtuer, likr oil in the water and water in the oil, if there is in the oiol it will look light brown and thick, in the water you will see oil bubbles in the radiator

Posted on Jun 18, 2009


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2 Answers

I flushed out the coolant in my 91 Mr2 and Added new coolant and its not going threw and car and over hearing how do fix?

If the heat goes up and then back down. You have an air pocket in the engine. it will purge itself, but you have to keep check on the level in the reservoir.

May 03, 2015 | Cars & Trucks

1 Answer

Im having issues with over heating ...i changed the thermoustat the radiator cap and it cant be my pump cuz im getting flow what could be happening ....oh this didnt happen untill i got my three belts

are you sure the dash guage is not fibbing, many do on old cars.

use a pyro gun and not guess.

sure overheating makes any engine run bad, and misfire.

and even can warp the head. engine will ping hot too. (bad happens)

correlation is not always causation. (find truth first, then lay blame)

but do check for missing belts and loose belts or routed wrong.?

The RaD TUBES must not be clogged. a 94 is a very old car.

we use a $20 IR pyro gun to see if rad core tubes read the same

top and bottom if NOT, they are cloggled. 5min work on a hot engine. (harbor fright sells 3 guns all 3 work like MAGIC)

is the RAD full of 50% AF coolant> , look in the RAD hole, not the side overflow clear tank (useless to look there now, many are bad, ask why)

pump most flow. sure.

thermosat not backwards or upside down and bleed hole must be UP

radiator core or the A/C cond. core up front must not be packed in leaves or bugs. or dirt. clean it.

also a weak clogged rad, will overheat when a bad running engine goes into limphome mode, (retarded timing sends tons of extra heat to the water jackets , when this happens, ask why technically)

so you have 2 things wrong, both add up to overheating.

I can demonstrate this .

Is the check engine light off, running and not overheated yet.?

does it overheat moving and parked.?

or only parked. or both?

if it never overheats moving fast , the fan is no good.

if it only overheats parked, the fan is bad.

so when it overheats and when not, is a key bit of evidence..

test the fan, the FSM covers this check. for all cars.

Jun 03, 2014 | 1994 Isuzu Rodeo

2 Answers

Heat not blowing hot air and car temp gauge goes high

the way to check the thermostat is with the motor hot feel the upper radiator hose to see if can squeeze it. you should be able to squeeze it. the water pumps is big problem to

Jan 26, 2013 | Chrysler Cars & Trucks

2 Answers

Will the bad waterpump on a 2003 pontiac aztek cause the temperature to overheat sometimes but run good others?

the water pump is working
the problem indicates blocked radiator cores preventing full flow at high rpm
have it flow tested by an accredited radiator shop or just fit a new radiator

Jul 13, 2017 | 2001 Pontiac Aztek

1 Answer

Replaced water pump and termastate, car still over there some kind of in-line valve for the coolant

When you put thermostat in did you put spring side towards the engine? Did you get the air pockets out? Do both upper and lower radiator hoses get hot? If both radiator hoses get hot then you got out the air pockets. Does the cooling fan kick on? Is the air deflector still on the car. The next step is to check for blown head gasket. Get the engine hot make sure both radiator hoses are hot and antifreeze is filled to the top hold rpms around 20 to 25 grand and watch for air bubbles. If there is air bubbles and the antifreeze doesn't go down that a good chance of head gasket. I the antifreeze goes down that just air pockets coming out. If you not sure or want to double check after making sure your system is fuel of antifreeze and let engine get cold. Then start car and run 20 to 25 hundred rpms and watch for air bubbles. This sometimes is easier because you're not dealing with that hot antifreeze. They also make what they call a block tester if you want to spend more money. They work but I'm not that thrilled about them. The best way is with an exhaust analyzer also known as emission machine to test for HC in the cooling system. Just be very careful if antifreeze goes up the probe it will damage the machine. If you run through all this checks you should find what is causing the problem. Opps I forgot the temp gauge and or temp light may not be right but if your also steaming it's not them.

Nov 01, 2010 | 1998 Pontiac Sunfire

1 Answer

Start car and the idle goes to 3000 rpm, holds there for around 12 seconds or so and then comes down to around 1200. when driving if stopped and you put the car in park or nuetral the idle will go up to...

it sounds like a vacuum leak to me, my car had the same problem but when i changed the hose that connected the valve cover to the fuel injectors the rpms dropped back down to about 800 rpms

Sep 17, 2010 | 1999 Saturn SL

1 Answer


Concerning the heater problem.Sounds like you have an air pocket in the system.To remove the air pocket take off the radiator cap in the morning when the car is cold,fill radiator to top.Start the car.Turn on heater to high.Allow car to run until it gets to operating temperature.Now you will see the fluid in the radiator start to go down.This means the thermostat is opening.As fluid goes down fill radiator to top (with 50/50 antifreeze/water mix).You may have to wait a moment for it to continue to move down.Once it stops and the radiator fluid isnt going down,slowly bring up the rpm's (by either turning the throttle with your hand or have someone put their foot on the gas) to about 2000rpms and hold the rpm's there steady.As you hold the fluid will go down a little more.As it does fill to the top again and quickly put the radiator cap back on while the rpm's are steady at 2000.After the cap is correctly on release throttle.This should remove the air posket.

Oct 09, 2009 | 1996 Ford Crown Victoria

1 Answer

Top hose hot and bottom hose cool...replaced radiator,condenser auxillary fan unit/resistor, replaced harness (spliced) from aux fan unit to temp sensor in the wont work and I dont think...

sounds like your water pump is air bound ( there is a air bubble in your cooling system,or your water pump isn't turning.Bleed the cooling system by jacking car upso the antifreeze fill area is the highest point and run the engineat 1500 rpms add water if it goes down that tell you that the water pump is pulling.Also see if you have a air bleed on the cooling system.Keep the rpms up until you can't add anymore water then put cap back on before returning the engine to normal idle speed.

Aug 09, 2009 | 1994 Volkswagen Jetta

1 Answer

Engine overheating\ cools down when rpms get to 4000

i would get a radiator flush and fill to make sure the radiator is clear and clean. it could be a head gasket if you were losing lots of water but i dont think thats the case.get it flushed out and go from there

Jan 08, 2009 | 1990 Subaru Legacy

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