Skip the auto shop - Our mechanics make house calls

Q: Coolant temps get really high but cool down really fast

asked by on

With normal driving the coolant temps get really high but seem to cool down fast also. Once they cool temps seem to fluctuate a lot between 170 and 210. I have already replaced the coolant and t stat and checked for a blown head gasket.

My car has 93000 miles.
My car has an automatic transmission.

This is may be a failing coolant fan switch. Try checking the coolant fan thermostat switch to be sure I is coming on at the right temperatures. You may also need to have the fan speed checked t be sure it is operating at the proper RPM’s according to engine RPM’s. I would recommend having an expert from YourMechanic come to your home to diagnose this and possibly repair coolant fan switch.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Can I attach a camper to truck?

Whether or not you can attach a camper to your vehicle depends on your specific vehicle. Luckily, check inside the glove box for a large label. This is the ‘Loading Information’ label that will tell you if a slide-in camper...

Q: Hi Scott. I have a 2013 Ram 2500 with 70000 miles on it now. I took it to the dealer with 50000k on it with a front pinion seal le

If the seal is repeatedly failing one possibility is the pinion itself has too much play within the assembly. That could be due to a design issue and/or wear in the bushing and/or bearing that supports the pinion shaft. There...

Q: Looking for location of multi axis acceleration module for a 2017 dodge ram 3500

Also known as a dynamics sensor - this is located on the floor panel transmission tunnel under the center floor console (or if equipped with a bench seat, under the front center seat section) next to the Occupant Restraint Controller....

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.