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Epica 2005 Automatic Overheating & Surge Tank Water Boiling

My Epica 2005 Automatic is overheating after running about 50kms. Temperature rising to full gauge and water in surge tanks is boiling causing pressure build and coming out of tank cap with pressure. I just changed surge tank and cap and no water coming out of cap (tank thread was damaged). But I feel surge tanks is still boiling inside and building very high pressure. So I changed Water Pump, Thermostat, Timing Belt & Pully. Also changed Head Gasket, aligned head surface level, changed plugs, changed transmission oil (in fact changed almost all cooling system components. But still overheating, especially with AC on... can anybody suggest me how come out of this problem... One more thing I observed is gears are shifting with a little delay and ignition timing is little advanced.

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  • Kawa
    Kawa Nov 08, 2013

    Hello: overheating is not have any relation with water pump or cap.. the trouble with ( CTS ) coolant tempertuer sensor only.the CTS usualy sending puls infromation to ECM Engine control Moduler. while CTS sending incorrect information to ECM. over 90 degree temprtuer ECM make a fault sending to injectos with fan of cooling system ..then the car make a mistake...so that change CTS only..

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Posted on Jan 02, 2017

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onyeredson
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SOURCE: 04' Passat Overheating

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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