Skip the auto shop - Our mechanics make house calls

Q: Cooling system issue - 1999 Chevrolet C3500

asked by on

Several months ago, I did some repairs on the truck by myself. I had the radiator replaced. I installed a new lower intake manifold as well as new gaskets. It was all fine. The only issue I had at the time was loss of coolant. Now when I drive it, the truck is running fine and has no trouble starting. However, I had the oil checked and it turned into sludge and I found there is coolant in it. The radiator is full of this now. I thought that it's defective. It is spitting oil and is full of bubbles. I filled the cooling system with air but to no avail. Did I do the repairs badly and caused this or is it something else causing this? Do you have any advice what I should do now?

A: The lower intake manifold gasket you replac...

The lower intake manifold gasket you replaced seals both coolant, and oil passages. It is possible that coolant (under higher pressure) is leaking into an oil passage. It is also possible you have a bad head gasket - leaking coolant into an oil passage when you shut the truck off hot. A professional mechanic, like YourMechanic can help isolate this issue and address the possible coolant leakage you may be having.

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: Driver side Glass scratches after rolling down or up

Hello. The felt weather strips are there to wipe away excess moisture or fog from window. They are not designed to wipe away dirt or debris. You should clean the felt strip with a spray bottle of water or a...

Q: Hi can you use gasket maker on 05 impala oil pan 3.8 instead of paying 100 bucks for gasket

Hi there. If you use gasket maker instead of the gasket made for the motor, then you would not have a good seal and the oil pan would be too close to the oil pickup tube and restrict the oil...

Q: Radiator hose rubbing on pully or a belt

Hey there. If the accident caused the hose to move closer to the pulley, then you may not have much choice but to get the body shop to pull the frame back. If you can move the hose, then you...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...