Question about 2000 Audi A4

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Replaced heater core, car won't start need troubleshooting

Replaced the heater core, I connected everything and now the car won't start. I disconnected it again and it still won't start. What am I doing wrong?

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  • Audi Master
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Is battery connected, your heater core doesn't start the engine, is battery dead, retrace your steps, take your time, think, have patience, smile, now go see if you can work it out.

Posted on Jan 14, 2013

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  • Master
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If you changed your heater core, it has nothing to do with the car starting. Did you disconnect the battery when you did this? . The only other thing I can think of is a safety switch that won't allow the car to run if the water is low. This can happen if the system gets air locked. How did you fill the system back up? Did you hit any wires off while working on car? Did the car run fine before you changed the heater core? Let me know and we can go from there Cheers from NS Canada

Posted on Jan 14, 2013

  • Gustave Montes de oca Jan 14, 2013

    Yes, I did disconnected the battery. This car does not have a safety switch. I didn't hit any wires off. Yes, the car did run before I replaced the heater core. I connected all the cables, I also checked that the cable were connected and everything was inplace. I checked the battery and it's not dead, the care does not start at all, the dashboard light turn on but the car won't start it's dead. Any other suggestions? I wonder if I might off had miss connected cables or missed something.

  • Nina Jan 02, 2017

    Hello, i have same issue right now. Would you tell me how you did fix the problem please? I just replaced hearee core and the car won't start...

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Posted on Jan 02, 2017

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SOURCE: went to dealership to repair heater core on 2002

the water pump pumps the antifreeze witch flows through your heater core. if the water pump is shot your car would over heat. BUT i have never heard of water pump failer due to a system bleed? did they give you a reson for the timing belt.

Posted on Nov 06, 2009

  • 5370 Answers

SOURCE: have a 2001 audi a4. I replaced the heater core and have everything back together again, all systems functioned fine except the wipers failed mid swing and the engine turns over but fails to start. He

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.



From start to end troubleshooting these problems I suggest you to check the help link below and follow its procedure: -----


Mostly all types of car no start problems are discussed here with solutions:---

CAR NO START: ENGINE NOT TURNING OVER:

http://alltypesofpartsreplacing.blogspot.com/2012/11/car-no-start-engine-not-turning-over.html

---------

These will help.

Thanks.

Posted on Dec 25, 2012

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Owner replaced heater core on a 2000 Audi A4 and car won't start


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When you replaced the heater core, did you disturb the vehicle's ECU? This is usually under the dash, close to the heater core on many Korean cars and Japanese cars such as yours. If you have disturbed the ECU, its wiring or managed to get coolant on it when changing the heater matrix, then that could be your issue.
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It appears that you have a blown headgasket, a failing water pump, or a cracked block.

There is also the possibility of a freeze plug failing & leaking there.

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Shorted out alternator by mistake , now the car won't start. 125 amp fuse replaced.


Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks.

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Your fan or heater likely shorted out and burned up, causing your one of the main fuses to blow due to the spike in current. You will need to determine what burnt up and replace it before replacing the fuse, or you may create a fire hazard or cause further equipment damage. Also double check any changes to wiring to make sure that everything is hooked up properly.

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Can i by pass the heater core


i`m guessing that you are talking about the heater core blew and you have coolant on the inside of your car.you can bypass the heater core by disconnecting the hoses that connect to the heater core and connecting a hose connector between the two hoses and your done.however if you need heat you won`t have it until the heater core is replaced.

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I have steam coming out of my defroster & it smells like antifreeze without the defroster or heater even being on. What could this be? I am unable to see to drive because of a film that covers the...


yOUR HEATER CORE NEEDS TO BE REPLACED. ANTIFREEZE CONTINUALLY RUNS THROUGH YOUR HEATER CORE WITH OR WITHOUT THE HEAT OR AC BEING ON. THIS ALLOWS YOUR ANTI-FREEZE TO COOL ABIT WHEN IT RETURNS TO THE BLOCK.

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When my trailblazer over heats. there is fluid that leaks out of a drain hose on the fire wall. why is it?


Sounds like you may have water leaking out of your heater core.

This will cause an overheat condition, which you get because your engine cooling system can't pressure up as well.

You may also notice a kind of "sweet" smell to the air that comes from the air vents that blow when A/C or heater is on.

As water leaks into the A/C & Heater core compartment area...it trickles to the overflow drainhose on the firewall. This is usually intended for the condensation of the A/C core but a leaking heater core will drain that way too.

From what I hear, I'd see about disconnecting the heater core hoses going into the firewall and maybe use a splice to connect them to each other OR get a two 5/8 bolts and a couple clamps and plug the hoses.

This allows you to drive car without overheating and buys some time to get you another heater core (basically a "mini-radiator") Its summer, so you don't need the heater right now but keep in mind...you won't have a heater until the core gets replaced.

Hope this helps...

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