Skip the auto shop - Our mechanics make house calls

Q: After car is warm if I engage in park the heat will drop what causes that?

asked by on

When I turn the car on to warm up the temperature gauge doesn't warm up. It warms up enough to defrost the windshield is all. After car is warm if I engage into park the temperature will drop. What causes that?

My car has 130000 miles.
My car has an automatic transmission.

A: Hi there. The most likely cause for the eng...

Hi there. The most likely cause for the engine temperature to drop in park, is the engine thermostat is stuck open, stuck open is better than stuck closed. The thermostat is designed to bring the engine up to and maintain operating temperature. This typically will occur within 5-10 minutes or a couple of miles of driving. Now days, the PCM (powertrain control module)/computer is capable of recognizing the engine not coming to and maintaining operating temperature. The PCM should in turn, set a check engine light. Proper diagnoses should be performed, to avoid unnecessary repairs. I recommend having your vehicle's engine temperature drops in park 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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Looking to buy this vehicle and they say it needs o2 sensor replaced

Hi there. Without a proper inspection being performed, there is really no way to determine the extent of the needed repairs. If there is a stored code that points to the O2 sensor, that does not mean that the sensor...

Q: Car will not start - 2005 Cadillac CTS

Okay, so hopefully you have another vehicle to get around in. The first thing you need to do is get that code scanned. Once you have the code, you should be able to narrow down the possible problems quite a...

Q: Antifreeze leaking into vehicle

If antifreeze is entering the cabin, the problem is the heater core or piping to the heater core. The heater core is inside your dashboard and if it is leaking, antifreeze will run downward onto the floorboards and eventually leak out...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.