I am smelling fumes inside the cabin of my 1999 Eurovan, enough to cause headaches and make me feel sick. It has happened before and seems to happen when the car has been working hard, AC has been running, and we are in stop and go traffic.
I've taken it in twice to my mechanic who has tested for fuel line leaks and looked around for the issue but not able to find the issue. It seems like the smell is coming from the front of the car near the driver.
Opening the windows doesn't seem to clear it when it is happening and but once the car cools down and the car is aired out, it may not happen again until the conditions are right. Unless, it is actually happening on a low level on shorter trips and I am not noticing it.
My question is, how can I prove that there are fumes inside the cabin, with a carbon monoxide detector perhaps?
And then, if they exist, how do we figure out where it is coming from? If it is an exhaust leak, how do we find it? Thank you.