My 59 Apache with a 235 runs like a dream. The last 3 years have been spent getting the truck in the condition I wanted. It is not a show truck, but looks and operates great except...

When the heater blower is on it pulls fumes into the cab. I checked the entire exhaust system. No leaks anywhere. The exhaust pipe is behind the drivers door before the rear wheel so it should be venting out past the bed.

What am I missing??

Any thoughts would be appreciated. This has got me baffled!!

Your missing the last part of the tail pipe.The exhaust from the tail pipe is being sucked into the cab.Exhaust should exit at the very rear of the body (bed) to prevent this.

Thanks for the reply. The pipe turns out from the center of th truck to the outside drivers side. The tail pipe extends about 3" outside the step, maybe 2' behind the cab. Do you think that the exhaust would suck back iton the cab from that distance?? The part that really is confusing is that there are no fumes whatsoever when the blower motor is off, even if the vent is open. The only time I can smell the exhaust is when the blower is on.

Yeah, I'm trying to avoid the chore of running the exhasut all the way to the back, but if I do I want to be relatively certain that will fix the problem.

Would be nice if you could hang an flexible pipe of some kind on the end of the present pipe and extend it out to the rear.
Also could cover the air intake below the windshield and try it.
I assume that it has the fresh air heater.If it does try it with the heater set in the "inside air" position.
I had this experiance with a larger step-van truck-when it exhausted in front of the wheel the exhaust came into the interior.

The flexible pipe idea is excellent. Good call!

The inside air position is fine. It only happens on the outside air position.

I hadn't thought about the air intake, though. Maybe covering that would at least eliminate that possibility.

The bigger box van makes sense. If the exhaust can get into the cabin through the back, I understand how it can move forward to the driver. With the pickup, I can't see a way for the final exhaust to get blown forward to the cab when the truck is going 35mph. That is why I was looking forward of the cab. Just cannot find anything leaking up there.

Get the durned exhaust out back at least past the end of the rear bumper! We don't want to see your face turn red then gray, as in carbon monoxide poisoning!