Exhaust smell in cab when A/C is on Recirculation!

[scottman70]

WHen the A/C is on Recirculation and you floor it to pass or accelerate about 5 seconds later the cab smells like exhaust? Anyone have this problem or know what it could be? I have an 07 Aspen 4.7 with 57K miles on it......It doesn't do this if the A/C is set on fresh or outside air only on Recirc.....

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[15951a\]

Have the exhaust manifold gasket checked - there is probably a small leak.

[scottman70]

Originally Posted by 15951a\

Have the exhaust manifold gasket checked - there is probably a small leak.

I did some looking under the hood and there is no exhaust manifold leaking? I'm stumped?