A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

I replaced my radiator yesterday and now my heater is not warming up.

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Old Oct 9, 2005 | 06:56 AM
  #1  
Corey's Avatar
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Default I replaced my radiator yesterday and now my heater is not warming up.

I did the radiator, lower hose, fan switch and expansion tank yesterday and it all went very smoothly. Now my heater is only blowing out luke warm air. What could be my problem?
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Old Oct 9, 2005 | 07:02 AM
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Default You could have air in the system

You should try to bleed the system.
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Old Oct 9, 2005 | 07:17 AM
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Yeah, getting all the air out is a pain. Took me about an hour.
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Old Oct 9, 2005 | 07:24 AM
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Default Air in the system. 2 ways of getting it out

1st Find a realy steep drive way and pull up. Remove the expansion cap and let it idle until it burps the air out.
2nd way, locate the hose(s) next to the battery/firewall, one of these hoses has a bleeding valve.
If u need more info check the Faq.
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Old Oct 9, 2005 | 07:57 AM
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Default Do this, take it for a drive, at highways speeds, take the G14 with you

And every so often stop and check. This is very typical of Audi's. If the coolant is low, top it up, until it reaches a stable level... That is what the Audi Mechanics do... and me...
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Old Oct 9, 2005 | 08:15 AM
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I started doing this. The heat is beginning to feel warmer.
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Old Oct 10, 2005 | 05:37 AM
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Default I assume that you are done now, It must've taken alot of fluid... LOL

Is it heating better now? Also an FYI, you are supposed to change your G14 every couple of years, because some particles will precipitate out of solution and start to deposit on the inside of the coolant system. (I know its a lifetime fluid, but it eats through rads, hoses etc...) When I changed my rad, all the temp sending units were coated with a pink substance. So G14 should be treated like any other fluid.

$10 and some PITA every couple of years, will save you $500 in the future...
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