01 Excursion- multiple issues, HVAC, Cruise, 4wd

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May 25, 2022 | 10:12 AM

hertfordnc

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Cross-Country

Joined: Apr 2011

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01 Excursion- multiple issues, HVAC, Cruise, 4wd

I bought this truck in 2020 with 154,000 miles - runs great. Had just two issues. The 4X4 auto does not work, i have to manually lock the hubs. And, under a heavy load the AC will go from dash vent to defrost vent. This would only occur when towing a trailer but recently it got worse, now it happens with any serious acceleration.

Also, a couple months ago the cruise control stopped working.

The cruise light does not come on when i select or set cruise control.

As all these systems are vacuum controlled I'm wondering if there might be a common link?

I'm getting ready to hand it over to a mechanic but if anyone has any suggestions for what to check first I'd be grateful.

May 25, 2022 | 01:19 PM

Mike1

Lead Driver

Joined: Mar 2006

Posts: 6,259

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From: IL

Sounds like you have a vacuum leak, usually where the lines plug into the wheel area or the seals behind the wheel hubs are bad.

May 25, 2022 | 01:24 PM

projectSHO89

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Joined: Jan 2004

Posts: 19,762

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From: St Louis

Quote:

The 4X4 auto does not work, i have to manually lock the hubs. And, under a heavy load the AC will go from dash vent to defrost vent. This would only occur when towing a trailer but recently it got worse, now it happens with any serious acceleration.

Vacuum leak. Check the PVH solenoid, they tend to get cracked cases and leak.

Quote:

The cruise light does not come on when i select or set cruise control.

As all these systems are vacuum controlled I'm wondering if there might be a common link?

Could be any of a number a things except vacuum. Speed control is all electrical.

What engine is the truck equipped with? Circuits are different...