Question about 2001 Volkswagen Passat

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04' Passat Overheating

Eng is overheating. I changed out the thermostat, and nothing. Also, lots of pressure building up in coolant tank. Turned on heater and nothing but cold air blows through.

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  • Zachary Kloefkorn May 11, 2010

    have you done a full flush of the radiator?

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Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K.

Posted on Mar 02, 2009

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Air bubble from changing out your thermostat......lucky its not a blocked heater core

Posted on Jan 21, 2010

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Last year my 2005 Chevy Impala water pump went out I change the water pump thermostat and that was it change thermostat free other times after that do the bad thermostats the overheating never really...


If you have changed the water pump AND the radiator AND the thermostat and still have the problem then the hoses should be checked to be sure they are not collapsing, also make sure that the coolant is 50/50 water and coolant and the thermostat is installed right.

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My 01 Cavalier is overheating. I changed the thermostat and do not see any apparent leaks. The heater was blowing hot air before I changed the thermostat and now it's only blowing cool air. Any


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Important: On vehicles equipped with the 2.4L engine, open the coolant air bleed valve. The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.
Does the cooling fan come on ?
Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL™ coolant. If coolant other than DEX-COOL™ is added to the system, the engine coolant will require change sooner: at 50 000 km (30,000 miles) or 24 months.
Close the radiator drain ****. Remove the drain hose.
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When installing the drain plugs, use pipe sealer GM P/N 12346004.
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Fill the surge tank to the base of the filler neck.
Start the engine with the pressure cap off. Let the engine run until the upper radiator hose starts to get hot.
If the coolant level in the surge tank is low, add the proper mix of coolant until the level reaches the full cold line.
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Install the cap onto the tank with hand tight pressure.

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Why is my engine overheating?


You say that the hoses have a lot of pressure and are extremely hot. That's telling me that the coolant is not circulating. I would recommend changing the thermostat first, since it's the cheapest and more likely to get worn out first. A thermostat opens once the coolant gets to a certain temperature and builds up pressure, allowing coolant to flow. Either that or the pump. Just to verify, is the fan working? Hope that helps.

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That is a possibility, but also consider a failed closed, coolant thermostat, or failed Water Pump. Much cheaper to go that way first, than pull the head for a thermostat. I am presuming that your heater is working ok, so the pump may be ok too. Good hunting.
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Can a worn out coolant cap cause overheating


There is no radiator cap on the Northstar engine.
The only cap is on the surge tank (or expansion tank) and is pressurized.

So the answer is Yes, a faulty surge tank cap will result in the loss of coolant and therefore lead to overheating.

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There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

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