Water leak on footwell right hand side 2003 golf

Heater core leaking ... does it come in when its NOT raining??,,

Best I can do is make sure your wiper cowl is free of debris leaves and such. Possible water backing up from that and leaking into the car.

heater core is leaking

Check under the hood on the firewall on the driver's side. There are body grommets which sometime crack, fall out, or are damaged by stereo installers, trailer brake controller installation, or CB/shortwave radio installers. Also, if you smell antifreeze, it is a coolant leak. If you smell mildew, it is rainwater entering the cabin. Your windshield could be leaking.
And the worst, and incurable: a body seam weld could have broken.

drain through the firewall ,its blocked ,look for outlet and clean the end of the pipe

Please the radiator has been damaged. Ensure you change it before it turns your engine off totally leading to engine change.

Be careful next time.

Good luck.

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run water over it yourself and have someone look for the leak inside vehicle thats hat i do at the body shop its the quickest and easist but you need a helperthen you ew=will find the problem quick it may be a seal/ Please rate my response thank you very much

I understand there are 4 run off points for the water two at the front and 2 at the back.

on my golf i had a problem that the front one was blocked (off side ) if you open the door and look where the hinges are there is a black rubber nipple this was blocked.

I understand the back ones are underneath somewhere - if you do a sear on golf mk4 interior leak you should get the answer to your problem - I hope this information is useful.

sunroof guttering blocked try getting an airline around the sunroof when open and blowing down there ??

if its into the front passenger footwell i had this too, inside thwe door closure where the hinges fix is a small rubber hose that funnels water from the sunroof down the apillar in a tube and out, if thats blocked it will run into the car also it could be coming in throught the window seal inside the door and out just inside the door closure area.