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tapiiri

Retrofitting Ptc Heater To Mk2

38 posts in this topic

The PTC heater element has a permanent 12 Volt power source. This is the big (10 mm2) cable which is connected to the Battery junction Box. The 2 small wires which are connected to the PTC heater element come from the GEM module/fuse box. These wires carry a PWM (Pulse Width Modulation) signal which controls the capacity of the heater element. This way the heater elemant can be regulated fom 5% to 100%.

The heater control panel is connected to the GEM module/fuse box. In most cases this wiring is already present. If the wiring is present you only have to activate the PTC heater function in the software of the GEM module/fuse box after the PTC heater has been installed.

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Thank you, mate! Your help is priceless for me.

My main problem is that below. I don't have the wiring. In this occasion, do you know how can I make the connection?


The heater control panel is connected to the GEM module/fuse box. In most cases this wiring is already present. If the wiring is present you only have to activate the PTC heater function in the software of the GEM module/fuse box after the PTC heater has been installed.


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The easiest way is to take the wiring out of a scrap car. Usually the higher spec diesel versions do have the wiring factory fitted but my experience is that some petrol versions do also have the wiring factory fitted.

On my MK2 First Edition (a trim level just below Titanium) with a 1.6 Duratec 100 HP engine the wiring from the GEM module/fuse box to the PTC heater element was factory fitted. The big (10 mm2) cable which is connected to the Battery junction Box was not factory fitted on my car. I made this wiring myself using some 10 mm2 cable and suitable cable lugs.

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I've already made the wiring from the fuse box to the PTC heater myself too . My question is regarding for the other two cables left ( from total of four) ? Sorry if I havent't been clear enough and any inconvinience caused. Many thanks.

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Do I have either of these heaters fitted? 2008 1.6TDCi Titanium. Seems to take forever to warm up though. My old 306 HDi had a coolant heater and that gave heat within a mile, the Focus is still cold after 4 miles!

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I've already made the wiring from the fuse box to the PTC heater myself too . My question is regarding for the other two cables left ( from total of four) ? Sorry if I havent't been clear enough and any inconvinience caused. Many thanks.

The wiring can be well hidden behind the dashboard. If the wiring is not present you have to install it. The wiring schematics of the Focus MK2/MK2.5 can be downloaded from this forum.

Do I have either of these heaters fitted? 2008 1.6TDCi Titanium. Seems to take forever to warm up though. My old 306 HDi had a coolant heater and that gave heat within a mile, the Focus is still cold after 4 miles!

The Fuel Fired Heater or PTC heater were optional in most Western European countries. In some countries the PTC heater was not even on the options list. It is a known problem of most diesel engines that they warm up very slow. Installing the PTC heater system will be a big improvement.

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JW, I think I wasn't clear enough and you have misunderstood me. I'll try to explain it again with pictures.

Below is the pic of the PTC heater and the 4 cables that come from it. I've already wired myself the wiring for the big cable. My question is for the other two cables ( thin ones, black and brown, the ones on the right side below). My car doesn't have the socket to connect/plug them. Do you know how I have to make the connection in that occasion? I hope you understand me now. Thank you in advance for your cooperation. I am looking forward to hear from you. Cheers.

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The wiring colors of the PTC heater element are different from the wiring colors of the cars wiring loom. The 2-pole connector on the PTC heater element has the pin numbers casted into the connector.

Pin 1 of the PTC heater element connector is for the IGN. This should be a Green/Orange wire and further (after a connection) a Green/Black wire. This wire goes to Pin 5 of the C102 connector. The C102 connector is the big blue connector of the GEM module/fuse box.

Pin 2 of the PTC heater element connector is for the PWM signal. This should be a White/Black wire. This wire goes to Pin 9 of the C103 connector. the C103 connector is the small blue connector of the GEM module/fuse box.

gurcayy likes this

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Hello everyone!

Sorry for bringing up this old thread, but I believe it is better to ask a PTC heater related question here, than to open a new thread.

I have a question regarding the part numbers of the heater control panel that support PTC heater, which have been posted on the previous page:

Red ellumination:
7M5T-19980-BA
7M5T-19980-BB
7M5T-19980-BC

Do really only these three part numbers support the PTC heater, or is it the case like with PJB (the "higher" the letter the higher the part specification)?

I am asking this because I have an AA control panel number, and I am having difficulty finding these exact three part numbers.

I have found control panels whose part numbers end with BD, or BF. Do these part numbers support the PTC as well?

Thanks

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Part number 7M5T-19980-BD will also be suitable.

This is the latest part number which supersedes the part numbers (7M5T-19980-BA, BB, BC) I mentioned in my previous post. All other part numbers are not suitable.

Manual heater control panels wich support the PTC heater function are pretty rare. In some European countris this option was not even available. Best chances to find one are in Eastern Europe, the baltic states or Russia.

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Part number 7M5T-19980-BC will also be suitable.

This is the latest part number which supersedes the part numbers I mentioned in my previous post. All other part numbers are not suitable.

Sorry, maybe it's due to the light headache, but I don't understand. That part number was mentioned in your previous page post!

Did you mean to say 7M5T-19980-BD?

Thanks

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I did indeen mean part number 7M5T-19980-BD.

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I did indeen mean part number 7M5T-19980-BD.

Great, thanks!

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