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Heater Control Valve Electrical Connector Not Have Power

#1 User is offline   thanosGR 

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Posted 23 February 2016 - 09:38 PM

Hello!

If starting engine and pressure a/c button work light and a/c ice perfect but have only hot air..

Central Fuse Box is ok
Auxiliary Fuse Box 2000 1/2 onwards (Fuses) (under bonnet) is ok
http://www.pumapeopl...entral_Fuse_Box

I have new Heater Control Valve and electrical connector not have power... why?

Thanks you!!!

#2 User is online   Ian G 

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Posted 24 February 2016 - 03:25 AM

Heater control valve power is decided by the heat dial on the panel.

Normal operation as follows -

Full cold - HCV plug 12v
Full hot - HCV plug 0v

Partial heat - square wave pulse (0v - 12v - 0v - 12v - 0v.....)
Width of the pulse depends on exact dial position.

Faulty panel stuck full hot would give you 0v at the HCV.

Check also the time at 0v, test for a minute or so to see if there is any pulse.

0v is normal at partial temperature but with pulses of 12v if you wait.

#3 User is offline   thanosGR 

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Posted 28 February 2016 - 04:24 PM

Thanks for reply!

With multimeter have


Full cold - HCV plug 0.01-0.05v for secont when time fan 1-2-3-4 and after secont 0.00v<br style="color: rgb(28, 40, 55); font-size: 13px; line-height: 19.5px; background-color: rgb(250, 251, 252);">Full hot - HCV plug 0v
This is faulty panel :(
This cable have any hidden fuse between HCV and panel hot/cold ?



#4 User is online   Ian G 

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Posted 29 February 2016 - 01:40 AM

Can you get any higher than 0.05v?

#5 User is offline   thanosGR 

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Posted 29 February 2016 - 01:17 PM

No 0.05v is higher and waited for 5 minutes.

#6 User is online   Ian G 

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Posted 29 February 2016 - 07:13 PM

I have never seen this fault.

Normally the panels give 12v but the pulses are wrong.

Can you see what voltages you have on the plug to the panel.

#7 User is offline   thanosGR 

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Posted 16 March 2016 - 01:13 PM

with all cable and start a/c the power from board out is 0v
http://prnt.sc/afyjq2
i think have change board..



#8 User is offline   Y0ungn1ck 

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Posted 20 March 2016 - 04:18 PM

My Puma has just developed a similar problem but mine stays cold. Ford oem HCV replaced very recently, the a/c light and fan all work. I have no multimeter to check voltages, etc. Is there a simple way to way to tell if fault is HCV or Board and which fuses should I check. Thanks for any assistance.
2001 Ford Puma 1.7 in Medium Steel Blue, 1971 Triumph GT6 Mk3 in Wedgewood Blue, 2016 VW Polo GTI 1.8 TSI in Flash Red.

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