Q: Hi Mark I have an audi a4 2005 1.8 quattro AC seems to cut out in real hot tempratures also the transmission goes into limp mode

asked by on

I have 2 known problems AC automatically cuts out on very hot days it goes into econ mode by itself Transmission goes into limp mode at times when I go in reverse (not always like once every 3 or four times)

Trying to get an idea of the repair costs to determine if its worth keeping

My car has 144000 miles.
My car has an automatic transmission.

A possibility with the A/C system is a fault in the evaporator that causes internal and/or external icing. The resulting high head pressure causes the control circuitry to "throttle" the compressor, hence the ECON mode. Check for a blocked air filter and or blockages in the ducting to the evaporator. Any other cause of high head pressure, such as a blocked condenser or inadequate airflow over the condenser, can cause this as well. If there are no obvious external blockages, schedule an a/c diagnostic and the responding certified mechanic will resolve this. There are no widespread reports of limp mode via the route you describe. The first thing to check for are any stored OBD-II trouble codes that might provide clues. I would first look for a fault with external controls including the possibility of a bad wiring harness connection or a missing ground connection. There are engine controls, too, that can cause limp mode to set and those have to be checked. These include the manifold absolute pressure (MAP) sensor and the throttle position (TP) sensor. To resolve this problem you are having, the service to request is a shift diagnostic - limp mode. If you request that service the responding certified mechanic will come right to your location and get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Hi Mark I have an audi a4 2005 1.8 quattro AC seems to cut out in real hot tempratures also the transmission goes into limp mode

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My 2013 Mercedes benz c250 ac won't work, it blows hot air and the ac button light flashes red three times and then turns of

Hello. On this vehicle for it to be acting up like this it typically means that there is a programming issue with the HVAC unit. It is also possible that the system has a small leak if it has been...

Q: Soft brake pedal after replacing rear brakes and master cylinder 2003 Audi A4

Hello. If you have no pressure to the rear calipers at all and if the master cylinder is new then you may have forces some debris into the ABS unit when you compressed the pistons in the rear calipers. In...

Q: Rubbers on propshaft

Two things you will want to look at. Number one, the propeller shaft needs to be balanced. Ensure there are no indications of propeller shaft weights missing. Also, when replacing the center bearing, the bearing has to be pre-loaded towards...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.