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Model specific boards => Golf mk7 => Topic started by: braddk on 06 February 2025, 16:40

Title: No heat Golf 7
Post by: braddk on 06 February 2025, 16:40

Hello all having a problem with my tdi 1.6 from 2013

Ive changed the battery
Ive checked heater matrix its warm so no clog
Ive checked battery its good

But there is no heat coming out and Start / Stop dosent work when heater is enabled

anyone know what this can be ?




2 Faults Found:
1048834 - Functional Limitation due to Energy Management
          B10CD 00 [008] - -
          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 7
                    Fault Frequency: 2
                    Reset counter: 154
                    Mileage: 278224 km
                    Date: 2025.02.03
                    Time: 15:57:53

                    Voltage terminal 30: 11.9 V
                    Auxiliary heater: in stages-Enabling for auxiliary heater operation: No enabling
                    Auxiliary heater: in stages-Act.val.: 1
                    Auxiliary heater: in stages-Specified value: 3
                    Auxiliary heater: in stages-Specified value for control: 3

1048835 - Functionality limited due to Engine Control Module
          P1719 00 [008] - -
          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:

Title: Re: No heat Golf 7
Post by: Carbon VW on 06 February 2025, 21:04

Hello! Firstly congratulations 278,000km on a little 1,6tdi. They are a great engine. This is the gti forum but sure we can help.have you removed the silicate “bag” from the coolant expansion bottle ? Or does your bottle say “mit silikat” ? It’s been discussed a thousand times on here but worth removing it or at your car’s age, renewing the bottle and the coolant. Have you checked all the coolant hoses for any splits or leaks ?
Can you smell coolant under the bonnet ?
How do you know the battery is good ? Have you performed a test on it? Did you mean you charged or changed the battery ? The battery will need to be coded to the car if your car has a BCM attached to it.
Check the coolant pipes at the bulkhead, one should be hot and the return should be cold ! Are you losing coolant ? Sorry for all the questions but it’s a start ! Or else just bring it to a garage you trust and get the to diagnose it, good luck
ps. It could still be the heater matrix due to getting clogged due to silicate bag split or just be the matrix pump. Due to the design of the matrix it may feel like nothing is wrong as inlet and outlet pipes are hot, the only way to check it is to measure for temp drop using a laser temp gauge. My bet is it’s blocked

Title: Re: No heat Golf 7
Post by: 2007GTI on 13 February 2025, 15:52

See other thread, my issue was the auxiliary heater pump, new OEM fitted and it solved my problem.