Fiesta Mk5 Problems

Tesla

Tesla

Tesla

Soldato
Joined
19 Jan 2003
Posts
17,579
Location
Bristol, UK
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EDIT
Bumped an old thread of mine as the fault I fixed 3 years back has resurfaced.

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Hi,

My Mum drives a Y-plate (so Mk5) Fiesta 1.6 Ghia. It's not a bad little car and even has leather, fake wood, AC and 6-disc changer!

Anyway, it has developed two faults.

Firstly, the heater is stuck on the hottest setting. Regardless of dial position, AC on/off or speed. Any ideas?

Secondly, the rear wiper has odd behaviour. If you switch it on it works fine, if you switch it off it goes off instantly instead of returning to it's rest position (out of the way). Again, any ideas?

Thanks in advance, want to sort this for Mum as it's very uncomfortable driving around with the heat on full whack, espescially in recent weather.
 
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the wiper thing, mine did the same until the motor finaly went. you have to try and stop it at the bottom.

as for the heater bit, mine stuck on cold no matter were the dial was, i think it was the heating element that went.

may be useful, may be not :p
 
My rear wiper was doing this for a while, now it's totally borked, if anybody knows how to fix it it'd be nice :p

My car also had the HCV replaced with the same problem before I owned it, I hope that isn't going to come back...
 
Begbie said:
Heater thing done that in my mates old mk4, be glad its not stuck on cold!
Click to expand...

Mine is....bit chilly earlier this year :p

Although saying that, it doesn't even give any temperature control to the air at all, just outside air temp really....
 
All i know is on my car (which isn't a fiesta) there is a problem which is just like the one the OP described and the way to fix it is to replace some heater resistor of some kind?

I'm sure if you take both of these things to the Ford garage they'll tell you what they think might be wrong (and then you can go away and fix it yourself :))

EDIT: this may help http://www.honestjohn.co.uk/forum/post/index.htm?t=40471
 
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Fixed the heater problem and replaced the coolant at the same time.

I stuck my multimeter on the rear wiper loom (in the boot) and get 12v when the wiper is OFF and 0v when it's on. :confused:

Furthermore, my girlfriend also has a Fiesta Mk5, a 1.25 on a W plate. Recently, a really bad damp/musty smell has occurred. Cannot find any damp leaves trapped anywhere or signs of leaks. Are there any known problem areas to check?
 
The passenger footwell is one of the main problems for this. My windscreen leaks in the middle, goes behind the dash and trickles into the passenger foot well. Check the pollon filter and the rubber gromet in the nearside bulk head to make sure thats all ok.
 
Thanks for the advice.

I don't think it would cost much to have your windscreen removed and refitted. Probably an hours labour ~ £50? Maybe that would help your leak?

I just replaced the mondeo windscreen and that was £150 fitted for a new heated one.
 
Bumping up an old thread as the heater-stuck-on-full problem has reoccurred with my Mother's Fiesta.

Do you think the (just) 3 year old valve has failed already? I am thinking multimeter across the valve multiplug would help me diagnose but am not sure what output to expect?

With regards to the musty smell in my Girlfriends Fiesta it was leaking in around a rear light cluster. A tiny leak but pooling up under the rear bench over time so stripped half the interior out, sealed the lights and has been fine ever since.

The rear wiper I never got to the bottom of.
 
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Just put a multimeter across the 2-pin multiplug which attaches to the heater control valve and I get 14v regardless of temperature set on the dash.

Edit - Googling suggests 14v = Cold on the dial so even more odd. 0v hot and a pulsing voltage in between. How would a pulsing voltage appear on my Multimeter?
 
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Swapped out the heater control PCB only (found a smashed up fascia but intact PCB from a Puma at a local breaker) and all is working.

£5. Bargain.
 
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