Question about 2001 Volkswagen Passat
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.
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?
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Paul 'W' U.K.
Posted on Mar 02, 2009
Air bubble from changing out your thermostat......lucky its not a blocked heater core
Posted on Jan 21, 2010
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Posted on Jan 02, 2017
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