Audi A4 1.8 - Heater Problems

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Wed 25 Jul 2007 20:54
Audi A4 1.8 - Heater Problems - messa
I've got an Audi a4 1.8 when I got the car the heaters did not blow hot air they only blow cold but last week i was out and they started to blow warm could any one tell me what's wrong the car as got climate control the engine temp runs at about 60C, the radiator is only just getting warm but the rest of the pipes around my engine bay are hot,what is my problem,(down the right side of my engine near the front there's 2 pipes that go in to something 1 is hot the other is cold)can anyone tell me what's wrong as I'm not really clued up on mechanics. Thank you,messa.....


Subject line tweaked along with some spelling corrections - PU,
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Mon 13 Aug 2007 17:51
Audi A4 1.8 - Heater Problems - messa
in the time iv posted the message above my heaters av started to work they now blow hot air but do not blow cold which is a problam now its got warm weather as everytime my wife takes our 3 month old daughter out its a bit to hot for them ,any ideas would be greatfully appreciated,thanks messa....
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Mon 13 Aug 2007 19:40
Audi A4 1.8 - Heater Problems - adverse camber
the two pipes (metal?) might be the a/c pipes.

Your engine temp is low - I would start by replacing the thermostat. At the same time flush the radiator and also check the function of the radiator fans. I think there are two one a viscous fan one normal.
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Tue 14 Aug 2007 18:32
Audi A4 1.8 - Heater Problems - messa
thank you how do i check the function of the fans,yes there is two fans how do i know which one is the viscous fan thanks ......
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Wed 15 Aug 2007 03:16
Audi A4 1.8 - Heater Problems - bk.bas
the viscous fan is the large plastic fan just behind the radiator. It generally turns over slowly until the engine temperature rises to the hot zone (not sure what the temperature is where it engages) when it will kick in as the viscous coupling engages. Check it's not running hard all of the time as this will over cool the engine...also check the thermostat. Just a final note. Make sure that you have adequate anti freeze (red) as it also acts as an inhibitor against rust & other gunk. A friend of mine has an A4 1.8T which had a rad leak...he kept topping up with water and a few months later the heater matrix was shot and had to be replaced at a cost of around £500! If your heater is intermittent try flushing it, if you have A/C it should be icy cold, if not it may need gassing or other parts. An aircon specialist is a better bet than a main dealer for this sort of repair
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Wed 15 Aug 2007 10:58
Audi A4 1.8 - Heater Problems - adverse camber
I would first replace the thermostat and flush the system. Then come back and tell us whats happening.
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