Skip the auto shop - Our mechanics make house calls

Q: what would cause no reading on coolant and ac to stop working

asked by on

My coolant display temp is a digital readout and its displaying ---- When this happens the ac also stops working. It doesnt do it all the time.what could cause this?

My car has 95000 miles.
My car has an automatic transmission.

Hi there. From the description you have provided, your vehicle’s coolant temperature displaying ---- and a/c stops working, are most likely related. It could be, a faulty coolant temperature sensor intermittently going open. It could be, a poor electrical connection causing the inoperative display. The coolant temperature is monitored by the BCM (body control module) and PCM (powertrain control module). If, the engine’s coolant temperature is not being recognized, the PCM could disable the a/c not knowing the vehicle’s engine temperature, and the IPC (instrument panel cluster) display could be ---- because, the BCM is not recognizing the engine’s coolant temperature. I recommend having your vehicle’s intermittent coolant temp display and a/c stops working be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. what would cause no reading on coolant and ac to stop working

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: Blocked exhaust

Hi there - no, blocking the exhaust will not damage valves or lifter. It will, however, cause your engine to lose power quickly (minutes), depending on how severely the exhaust is blocked. Think of the engine as an air pump,...

Q: Police interceptor makes grinding sounds

The noise is coming from the internal transmission bearing or overriding clutches. Not all of these parts may have been replaced when the transmission was overhauled. I can only recommend having a qualified transmission mechanic come and listen to...

Q: The air conditioning, heater, and defroster are not working.

The symptoms you are experiencing can be caused by a few different things. If you are hearing a gurgling noise and your heater is not providing heat, then I would check the engine's coolant. If the coolant is low, it...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.