Question about 1995 Mazda MPV

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Engine over heating

I change the radiator &water pump but stil over heating but when i remove the radiator cap its ok looks like some pressure in the cooling system dats pushing out water from the radiator i check the oil its ok its not white or milky the car got a turbo diesel model kd-lvlr 15v

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  • Contributor
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Solution One and two are on the track But I believe you have a crack or seal problem in the engine.

One way to tell is get it checked for compression readings. Good is over 200 approximately. But look at the specs to be sure.
Solution 2 says remove the thermostat but it maybe too late.
If you have pressure problems there is not a way I know to beat it except remanufacture or rebuild the engine.

Diesels produce high compressions so the 200 value may not apply.
Any way you look at it is a hard job and expensive these days.

Posted on Jul 27, 2009

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Check your thermostat. It probably stuck closed. I would just remove it if you are in a warm area for a wile to see if that will fix the problem. If it does not heat up when not in put a new one in.

Good luck

Posted on Mar 03, 2009

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Hi!

Is the fan working? Have you checked the relay? Also check for any leaks.

Posted on Mar 03, 2009

  • Rylee Smith
    Rylee Smith Mar 03, 2009

    Also, check for the obstruction in cylinder head. Check #1 coolant port passage in head for restriction.



    Also, check for the FAN CONTROL MODULE which is controlled by the PCM. If the module is not working correctly, the engine cooling fan be inoperable or operate at incorrect speeds (too slow).



    Please ask for further clarifications.



    Thanks

    Rylee

  • Rylee Smith
    Rylee Smith Mar 03, 2009

    You can check the fan when the gauge hits aboiut the half way mart to 3/4 then the cooling fan should kick in and u should be able to hear it. if it doesn not turn on and over heat then there is something wrong with the fan or the fan circuit.



    Also, a failed head gasket probably caused the entire problem. The coolant, if not changed every 2 years or so, can eat away at the head gasket and cause premature failure.



    The issue is not how much water is in your radiator, but the radiators ability to hold pressure. Pressure prevents the coolant from boiling and thus turning into steam. I believe that the old coolant took the head gasket.

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2007 nissan exterra overheats


Hi Kim,

I can feel your frustration. It sounds like you've done all the logical stuff already. The "donut hole" in your process would seem to be not changing the water pump. The water pump as you might imagine, is responsible for circulating (pumping) the relatively cool water in the radiator into the running engine that contains the hot water. Hoses connect the two together. A thermostat is between the radiator and the engine. Once the water in the running engine gets to a certain temperature, the thermostat opens allowing the water pump to send cool water into the engine and hot water out to the radiator to be cooled. The heater core is usually on the passenger side firewall area.

It sounds like the water pump is the only thing left to change - if it isn't working - it can't circulate the water - and will result in overheating. Lastly, a clogged heater core shouldn't cause the engine to overheat - in fact, if the engine begins to overheat, you should turn the heat to HIGH fan and HIGH temperature to help remove some of the heat in the coolant.

Good luck!

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Changed the water pump and now it over heats


Many people overlook the cooling system pressure cap cheap to replace but often overlooked , the radiator may also be internally restricted. Rad shop would be able to confirm if this is the case. rad cleanout and engine block flush may help. Hopefully this is useful to you.

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If coolant temperature is ok, i would only change the radiator cap.

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My 99 alero v6 is over heating not leaking ight mite be hoses or thermostat . or head gasket but when it overb heats the smoke comes from the top of the engine


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1 Answer

2001 vw beetle service manual ? need to change water pump, how hard is it? dont look to bad.


Check this procedure to how to replace a water pump (DIY Complexity: Moderate / Time: 3.5 hours):

Parts:
1. Water Pump

Tools:
1. Screwdriver
2. Scraper
3. 3/8 in. Drive Ratchet
4. Cooling System Pressure Tester
5. Needle Nose Pliers
6. Socket Set
7. Radiator Hook Tool

Supplies:
1. Coolant
2. Silicone Sealant

Steps:
Step 1 With the engine off and cold, open the hood and locate the vehicle’s water pump.
o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
o Tip: Before removing the radiator cap, squeeze the upper radiator hose to verify that the cooling system is not pressurized.

Step 2 Remove the radiator cap.

Step 3 Install cooling system pressure tester. Apply the pressure indicated on the radiator cap or in the owner’s manual.

Step 4 Inspect cooling system components for leaks.

Step 5 Place a drain pan under the radiator. Open drain valve or remove the lower radiator hose to drain cooling system.
o Tip: Depending on the vehicle, lifting the vehicle may be required to gain access to the lower radiator hose.

Step 6 Remove the drive belts or serpentine belt.

Step 7 Remove any hoses connected to water pump.

Step 8 Unbolt water pump from engine. Remove the water pump.

Step 9 Using a gasket scraper, clean the mating surface on the engine block.

Step 10 Install new water pump and new gasket. Tighten bolts to manufacturer’s specifications.
o Tip: You may want to use a light bead of silicone designed for water pumps.

Step 11 Re-install any hoses and belts that were removed.

Step 12 Re-install drain plug or lower radiator hose.
o Tip: Squeeze the radiator hose. If it feels soft you may want to replace the hose at this time. Always use new hose clamps.

Step 13 Refill radiator with a 50/50 mix of coolant and distilled water, then pressure test the cooling system and check for leaks.

Step 14 Fill overflow reservoir with same mixture.

Step 15 Leave the radiator cap off, start engine and let it idle. You should see the system“burping” bubbles of air. Refill the radiator to the top.
o Tip: Most air is expelled after a couple minutes of idling. Be cautious of potentially hot fluid overflowing.

Step 16 Install radiator cap.

Step 17 Road test vehicle, keep an eye on the engine temp gauge if vehicle runs hot, there still might be an air pocket in the cooling system. The cooling system should be topped off after vehicle has fully cooled down.

Good luck.

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1 Answer

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You can change the water pump by doing these steps:

  • With the engine off and cold, o pen the hood and locate the vehicle’s radiator and water pump.
  • Remove the radiator cap.
  • Install a pressure tester on the radiator. Apply the pressure indicated on the radiator cap or in the owner’s manual.
  • Inspect the water pump for leaks. Remove the pressure tester.
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1 Answer

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You need to replace the radiator pressure cap. I would also replace thermostat, drain and flush radiator to start. If it continues the water pump may be not pumping water. If the thermostat is stuck closed it wont allow water to cycle through the engine causing it to boil and the pressure cap is not holding the pressure allowing it to flow to the reservoir. So first change the thermostat and the radiator pressure cap.

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8 Answers

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1 Answer

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