Skip the auto shop - Our mechanics make house calls

Q: Engine coolant leak - 2000 GMC Savana 3500

asked by on

Glycol leak coming from shield pan that covers large gear of transmission behind oil pan and filter. Oil looks good and oil level. Transmission fluid also good. No transmission fluid in radiator. Top of engine dry no leaking hoses. Just changed oil and oil filter, air filter. Any ideas where it could be coming from? Thank you

My car has 150000 miles.
My car has an automatic transmission.

Hi and thanks for contacting YourMechanic. Looks like the coolant is coming from the rear freeze plug on the back of the engine. For this issue, I would recommend putting coolant dye in the cooling system and run the engine for a couple of hours, then check for coolant leaks with a black light and yellow glasses. This will make the coolant stand out really bright and you will be able to see exactly where it is leaking from.

If you need further assistance diagnosing your vehicle, then seek out a professional, such as one from YourMechanic, to help you with pinpointing your coolant leak.

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: Temperature gauge fluctuation

There are two possible scenarios to check out. First, if the cooling system was not bled properly to get all the air out, then the cooling gauge can fluctuate, as the sensor can't measure the temperature of air/steam in the...

Q: RPMs running high on car

Sounds like you might have a large vacuum leak. Think of your engine as a big vacuum cleaner. If the vacuum cleaner has a restriction then it slows down, if the port is completely open it goes as fast as...

Q: If my car leaks oil and if i use synthetic will it leak more

The consensus in the industry does seem to be that existing leaks will leak more, to some degree, with the use of synthetic oil. This is ONLY the case if you have existing leaks and how much more of a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.