The air conditioning in the Peugeot 207 regularly fails due to a defective compressor or a lack of refrigerant. This occurs particularly often with both the 207 CC and the standard models. It leads to uncomfortable driving on warm days. Fortunately, the causes of this problem can usually be identified quite easily and resolved with the right approach.
Many owners suddenly notice that their air con no longer blows cold air, even though the system is still running. This occurs mainly with models from the 2006–2012 period fitted with the 1.6 petrol engine. The Peugeot 207 has various technical characteristics that can cause air conditioning problems. In this article you can read which issues occur most frequently and how to recognise them.
The air con complaints in the Peugeot 207 vary. Sometimes the compressor does not start at all. In other cases the system appears to function but does not provide any cooling. Bad smells from the ventilation are another recurring problem reported by owners. With a systematic approach you can track down the cause and choose the right solution.
Why the air con no longer cools
The most common reason is a defective coolant temperature controller. This part is also known as the thermostat. The controller is electronically operated with an electric heating element. Over time this element can burn out. It can also start operating outside its normal parameters. When this happens, the engine management computer activates safety codes such as P0171 and P0597.
These fault codes cause the air conditioning to be switched off automatically to prevent damage to the engine. The electric element in the thermostat fails mainly in older models that have been in use for ten years or more. The entire sealed unit must then be replaced, because repair is not possible.
A second common cause lies in the dashboard. The control panel (the panel with buttons for air con and ventilation) can give problems here. The compressor then does not receive a start signal. This happens because the signal wiring is defective. It can also be due to an internal fault in the panel itself. Sometimes it is a matter of failed bulbs or switches. These components block the signal to the computer. In that case you will not hear a click from the compressor when you switch on the air con.
A blown fuse can also cause the problem. This occurs mainly in the 1.6 petrol models from the years 2006 to 2009. The fuse is located in the interior fuse box and is specifically intended for the air con system. Finally, there may be air in the cooling system. This occurs particularly after maintenance work. The air causes overheating, which then makes the air con shut down.
How to top up the air con
Topping up the air con on a Peugeot 207 requires specialist equipment. You also need knowledge of cooling systems (systems that cool the air in the car using refrigerant). The refrigerant is under pressure and must be added according to specific procedures. It is therefore advisable to leave this work to a garage that has an air con charging machine.
There may be a loss of refrigerant. It is important to establish the cause of this first. Only then should you top up the refrigerant. You can also tackle the problem without a diagnosis, but in that case the solution is usually only temporary. A leak test shows whether there are leaks in the system. Common leak points are:
- The compressor and the seals around it
- Couplings and hoses in the air con system
- The condenser at the front of the car
- The evaporator behind the dashboard
Any leaks must be repaired first. The system must then be evacuated. Evacuated means: drawing the system empty with a vacuum pump. This removes moisture and air. The correct amount of refrigerant is then added. This is done according to the manufacturer’s specifications (the values in the car’s handbook). For the Peugeot 207 this usually involves R134a refrigerant, although newer models may use a different type.
Have you worked on the cooling system yourself? Then bleeding the system is important. You do this via the bleed nipple. The bleed nipple is a small valve through which air can escape from the system. You will find it on the heater hose at the bulkhead. You can also use the nut on the thermostat housing. The thermostat housing is the casing that contains the thermostat. Bleeding must be carried out with the engine running. The expansion tank must be completely filled. The expansion tank is a reservoir that absorbs pressure fluctuations in the cooling system.
What does air con repair cost
The cost of air con repair on the Peugeot 207 varies widely. The specific problem determines the cost. A simple inspection and topping up of refrigerant usually costs between 75 and 150 euros. However, this is only a temporary solution if there is an underlying defect.
Replacing the coolant temperature controller usually costs between 150 and 300 euros including labour. This part itself is relatively affordable, but fitting it requires some technical knowledge. With this repair it is sensible to bleed the cooling system completely straight away. This prevents new problems.
A new compressor is considerably more expensive. Here you can expect costs between 400 and 800 euros, depending on the type of compressor and whether you choose an original part or an aftermarket brand. Replacing the compressor also includes replacing the refrigerant. The dryer is often replaced too. The dryer is the component that removes moisture from the air con system.
Repairs to the control panel or wiring are harder to estimate. Sometimes the problem can be solved with a simple repair to a connector for 50 to 100 euros. In other cases the entire dashboard has to be dismantled. Labour costs can then rise to 300 euros or more.
Carrying out step-by-step diagnosis
Start by reading out the fault codes. Use an OBD scanner for this. An OBD scanner is a device used to read the car’s fault codes. Connect it to the diagnostic port under the dashboard on the driver’s side. Fault codes P0171 and P0597 point directly to a problem with the temperature controller. Other air con-related codes can also occur. These point to sensors or electrical faults. Sensors are measuring devices that measure temperature, pressure or other values in the car.
Then check the cooling system itself. Top up the system if the level is too low. Bleed the system thoroughly. Keep an eye on the engine’s temperature gauge. Does the gauge rise or fluctuate too quickly? Then there is probably still air in the system. Bleeding may be necessary several times. This is needed to remove all the air.
Next, test whether the compressor responds. Start the engine and switch on the air con. You should hear a clear click when the compressor engages. If you do not hear this click, then the problem lies with the control panel, the wiring or the compressor itself. A multimeter is a measuring device with which you can measure voltage and current. Use it to check whether a signal is coming from the dashboard to the compressor.
Inspect the fuse box in the interior. Look for the fuse that is specifically intended for the air con. Check whether it is still intact. A blown fuse is easy to replace. Do investigate why it blew. This helps prevent a repeat.
‘ This does not have a direct impact on the cooling function, but it makes using the air con unpleasant. ’
Recognising common symptoms
Different symptoms point to specific problems. Symptoms are phenomena such as no cold air or strange smells. Does the air con cut out suddenly? Then it is often a defective thermostat. The system previously worked well. This usually happens without warning and can occur in both summer and winter, although you naturally notice it mainly in warm periods.
If the compressor does not start at all, you will not hear any mechanical noise or click when you press the air con button. This symptom usually points to an electrical problem in the dashboard, the wiring or a blown fuse. In some cases it is a defect in the compressor clutch itself.
Cold air does come out, but it quickly becomes warm or feels weak. Then there is probably a leak in the system. A partially defective compressor can also cause it. The refrigerant then slowly runs low and the cooling performance gradually declines. This process takes weeks to months.
Dirty or musty air from the ventilation points to contamination or mould growth in the air ducts and evaporator. The evaporator is the component behind the dashboard that cools the air. This does not have a direct impact on the cooling function, but it makes using the air con unpleasant. The problem often gets worse if the car regularly drives short distances, during which the evaporator cannot dry out completely.
Preventive maintenance for your air con
Regular use of the air conditioning prevents many problems. It keeps seals supple and prevents the system from seizing. Switch on the air con at least once a month. Do this in winter as well. Let the air con run for at least ten minutes to flush the entire system through.
Check the refrigerant level once a year. If topping up is needed, have a full air con service carried out. This service includes checking for leaks and cleaning the condenser. The condenser is the component at the front of the car that dissipates heat from the refrigerant. The refrigerant is also renewed. Most garages recommend this service every two years.
Replace the cabin filter regularly. This filter is also known as the pollen filter. The cabin filter filters the air that enters the car. A clogged filter reduces air flow. This can lead to moisture build-up in the system. This promotes mould growth and reduces the efficiency of the air con. The filter is usually located behind the glovebox and is easy to replace yourself.
Watch out for signs of problems such as strange noises, weak air flow or water inside the car. Weak air flow means that little air comes out of the ventilation vents. Water on the floor on the passenger side may indicate a blocked condensate drain. The condensate drain is the small hose through which moisture from the air con drains to the outside. This drain must remain clear so that the condensate can be removed. A simple cleaning with compressed air often solves this.
When to go to the garage
Some problems you can solve yourself. More complex repairs require professional help. Replacing the compressor or tracking down electrical faults in the air con system calls for specialist knowledge and tools. The air con system is the complete system that cools the air in the car using a compressor, refrigerant and various components. Working with refrigerant also requires certification. Certification means that you have official proof that you are allowed to work with these substances. This is mandatory due to environmental regulations.
You have replaced components, but the problems persist. In that case professional diagnosis is necessary. There may be several causes at work at the same time. Replacing just one component then does not completely solve the problem. A garage with air con equipment can test the system thoroughly. Air con equipment is a test and charging machine for air cons. The garage tests the system under pressure and detects any remaining leaks.
Preferably choose a garage that has experience with Peugeot models. The electronics and cooling systems of the 207 have specific characteristics. These features require knowledge of the model. Ask in advance for a diagnosis with a cost estimate. Only agree to repairs once you have received this.
‘ This is estimated to prevent 80 per cent of air con failures. ’
Practical tips from owners
Many owners report that the thermostat fails. This usually happens after ten years or more of use. Once the thermostat has been replaced and the system has been bled correctly, the air con usually works fully again straight away. A sign that bleeding has been successful is condensation on the cold air con pipes. The system must be running for this to occur.
With dashboard problems, owners often report that they press the button but the compressor does not respond. Dismantling the panel and checking the wiring solves this in many cases. Expensive components are then not necessary. Pay attention to loose connectors and corrosion on the terminals. Connectors are the plugs on the wiring.
Always test the air con while the engine is idling. Also test it while driving. Some problems only occur under specific conditions. These are, for example, extreme heat or very short journeys in cold periods. Only top up refrigerant after a thorough diagnosis. This prevents unnecessary costs and follow-up problems. Preventive maintenance helps to avoid issues. Preventive maintenance means checking and cleaning regularly before something breaks. Check filters and refrigerant regularly. This is estimated to prevent 80 per cent of air con failures.
On the Carnews website you will find much more information about common problems. These problems occur with car brands such as Peugeot, Renault, Volkswagen and many others. Various models are also covered. Discover useful maintenance tips. Recognise faults in good time. Learn how to avoid expensive repairs.
Also read the other articles about the Peugeot 207 and similar models. These articles offer even more practical knowledge.
Frequently asked questions
With the Peugeot 207, the air conditioning often cuts out due to a defective electronically controlled coolant temperature controller (thermostat), causing the ECU to switch off the air con. There are also recurring problems with the control panel or the wiring, meaning the switch-on signal for the compressor does not come through (properly). In addition, defective or blown fuses regularly mean that the air con does not switch on. Finally, air in the cooling system or contaminated ventilation ducts / filters can cause poor cooling or bad smells from the vents.
Start by using an OBD scanner to read out the fault codes; if these point to P0171 and/or P0597, then the coolant temperature controller (thermostat unit) is a very likely culprit. Then check the AC fuse in the fuse box and listen to see whether you clearly hear the compressor ‘click’ when you switch on the air con. Next, check whether the cooling system is properly filled and bled (via the bleed nipple near the heater or thermostat hose) so that air bubbles do not cause overheating and shutdown of the air con. If all these basic checks are in order, a fault in the dashboard control panel or the wiring is the next suspect and professional diagnosis is advisable.
You can check the air con fuse in the interior fuse box yourself and replace it if necessary, and check whether the air con button and lighting on the dashboard panel work properly. Also check the coolant level and top it up if it is too low (always with a cold engine), and bleed the system if work has recently been carried out on the cooling system. When you switch on the air con, listen to see whether you hear the compressor under the bonnet “cut in” (click / higher revs); if not, check the plugs and visible wiring around the compressor. If there is a musty or bad smell, you can clean or replace the ventilation ducts and the cabin filter yourself using a suitable cleaning or disinfection product.
Indicative costs: for simple checks / fuses or OBD diagnosis €30–€80, for replacing and bleeding the coolant temperature controller / thermostat as the typical cause €200–€400, and for additional leak or function testing roughly another €50–€150. Call in a professional as soon as there are fault codes such as P0171 or P0597, the compressor does not switch on despite good fuses and controls, or if you have no experience with bleeding cooling systems and air con diagnosis.
Let the air con run for at least 10–15 minutes once a month (also in winter) to keep the compressor and seals lubricated and to prevent leaks. Replace the cabin filter in good time and keep the ventilation ducts clean to avoid air flow problems and contamination. During maintenance, check the coolant level, bleed the cooling system correctly and, if in doubt, have the fault codes (such as P0171 / P0597) read out so that a deteriorating thermostat is replaced in good time. Have the air con system checked every few years for refrigerant level and leaks instead of just “topping it up” without a diagnosis.