Question about Volkswagen Passat
It could be a number of different things. Most likely the heater core is plugged up. You can try flushing the heater core and reversing the connections of the hoses. This will work sometimes.
Posted on Feb 12, 2014
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Posted on Jan 02, 2017
impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat
Posted on Jan 01, 2009
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.
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Posted on Feb 24, 2009
SOURCE: AC not blowing cold air at times
poss causes are, sticking low pressure switch, defective Ac compressor clutch closing coil or incorrect clutch driven plate air gap, spec is 0.26 thousands.
Posted on May 11, 2009
chances are if you system was serviced by modern equipment then they would have pulled a vacuum before recharging .. that would eliminate moisture in the system .. the evaporator is inside your heater box .. you cant see it .. the condenser is the radiator like device in front of your engine cooling radiator ..
if the system is changed properly and still does not work or works intermittantly . then there is a good chance that the air conditioner clutch electronic module is bad .. thats a relay like device located on the drivers side behind the dash .. you have to snap off the dash side panel .. its normally hidden by the door .. inside that is the fuse panel and behind that is the relays/electronic modules .. the one that operates the air conditioner clutch is marked 384 .. there are other possibilities depending on your a more precise description of the problem ..
Posted on Jul 25, 2009
The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.
As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.
If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.
Posted on Mar 28, 2012
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