Vauxhall Mokka heater only blowing cold air
Variant: 1.6CDTI
Model Year: 2016
noticed the coolant level dropped so local mechanic said he replaced a water pipe, brought car back and the heater was not working he said he did not know what was wrong with the vehicle. Took vehicle to another mechanic they have changed the , EGR valve and cooler, Thermostat they said the water is flowing around the system correctly still no heater, now they have ordered a water pump, cant believe all these things have gone on the vehicle, car has done 65000 miles any one got ideas gladly received before I'm skint .
Posted: Oct 30, 2023 (2 years ago)
I would carry out a block test before doing anything else
Posted Oct 30, 2023 (2 years ago)
Not sure why the EGR valve was replaced to fix the heater . Should have had a cooling system pressure test carried out . Also heater hoses , inlet and outlet of heater matrix should have been checked to see if both hot
Posted Oct 30, 2023 (2 years ago)
Got the same problem with my 16 plate mokka 1.6cdti. Got no heat after changing waterpipe, had a new water pump fitted. Still no heat, flushed out heater matrix good flow of water. even had it to a friend that worked at vauxhall main dealers and he checked all the valves in
the climate control box heater box, had it on computer to test temperature sensors. He can't understand what's going on. Anyone got any idea?
the climate control box heater box, had it on computer to test temperature sensors. He can't understand what's going on. Anyone got any idea?
Posted Dec 10, 2023 (1 year ago)
If heater hoses into and out of heater matrix are both hot , it can only be a heater flap / heater flap actuator at fault
Posted Dec 10, 2023 (1 year ago)
Replying to post by whittingehame:
If heater hoses into and out of heater matrix are both hot , it can only be a heater flap / heater flap actuator at fault
Only 1 pipe is hot. No over heating problems drive 50 60 miles still the same. Run water through matrix, good flow of water
If heater hoses into and out of heater matrix are both hot , it can only be a heater flap / heater flap actuator at fault
Posted Dec 10, 2023 (1 year ago)
" Only 1 pipe is hot " That is the answer to your problem then
Posted Dec 10, 2023 (1 year ago)
Yes I know but what I'm looking for a is a fix,had new pump matrix checked thermostat checked computer checked no overheating problems vauxhall mechanic checked things .is there something I'm missing?
Posted Dec 10, 2023 (1 year ago)
Cooling system / matrix could be airlocked , try bleeding till both hoses are running hot .
Posted Dec 10, 2023 (1 year ago)
Replying to post by whittingehame:
If heater hoses into and out of heater matrix are both hot , it can only be a heater flap / heater flap actuator at fault
Very good answer, but how to access the heater flap?in my car actuators work,check them physically and test them , all three of them. The only guess is to access the heater box and open the flap door,can you help please?unless I unblock the heater flap no heating .
If heater hoses into and out of heater matrix are both hot , it can only be a heater flap / heater flap actuator at fault
Posted Aug 25, 2024 (1 year ago)
Actuators may be working but broken , unconnected to flap and not operating /moving flap .
Posted Aug 25, 2024 (1 year ago)
Replying to post by Mo:
Very good answer, but how to access the heater flap?in my car actuators work,check them physically and test them , all three of them. The only guess is to access the heater box and open the flap door,can you help please?unless I unblock the heater flap no heating .
What was it in the end
Very good answer, but how to access the heater flap?in my car actuators work,check them physically and test them , all three of them. The only guess is to access the heater box and open the flap door,can you help please?unless I unblock the heater flap no heating .
Posted Oct 21, 2025 (1 month ago)
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Parts mentioned
Exhaust Gas Recirculation Valve (EGR)
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