94 C3500HD 6.5 bucket truck has water in the heater blower! Getting inside rot floors - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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HVAC Discuss Heating, Ventilation & Air Conditioning related issues on Duramax equipped trucks.

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Old 03-13-2020, 02:51 PM   #1 (permalink)
Kgw51gmc
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94 C3500HD 6.5 bucket truck has water in the heater blower! Getting inside rot floors

I turned the knob and you could hear it sloshing around. Truck sat for 13ish years and the floors were soaked the whole time because of the lovely rubber floor mat setup in which water is guaranteed to get under the mats at some point or other and has no means of escape, so it stays wet forever and ever.
Today and yesterday I took the entire rubber mat out of both of my trucks, scraped and wire brushed whats left of the floors and painted with a brush, white rustoleum. One side on this bucket truck floor is gone, but other side is still in existence.

The water was/is getting in through the heater and dripping out of the heater box. I can't tell, while raining, where it's getting in. No obvious windshield leaks.

?: is there a common/normal route of entry like this? I took the cowl grille off in front of the windshield and reached in. Huge handfuls of leaves that have rotted into potting soil. Truck is not a flood truck, it's been on high ground, under walnut trees so long it was sunk down into the ground 8" deep.

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1997 Chevy c3500 6.5L 273k
5-spd NV4500, 4.10, 5T-elecDump flatbed Pensacola Diesel IP '18 , PMD relocate (duh), stock truck.

1994 Chevy C3500 HD 6.5L 175K, 4L80E, 4.63 Dana 80, 34'ish bucket (sunk in wet ground for 10+ yrs, dead due to PO attempts to repair , still hope). PO actually removed optic sensor and intake manifold to (I assume) spray starting fluid in, and after failing to start, gave up and left IP and engine OPEN for 10+ yrs. Walnuts and mouse doody down in around the valve stems in every port! Lots of cleaning. Be funny if it runs worth a darn.

Waynesburg, PA (near Morgantown, WV+ WVU)
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Old 03-15-2020, 04:19 PM   #2 (permalink)
JMJNet
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For 6.5L question is better posted in the 6.5L section.

As to answer your question, there is a drain hole approximately under the passenger front seat for the AC condensation.
When that hole is plugged, the water will spill inside the cabin.

You need to go under the truck and look for a small hose poking out.
If there is no hose, that also explain why it happen to yours.

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Old 03-23-2020, 09:07 PM   #3 (permalink)
Kgw51gmc
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I will check for that, probably plugged with rotted organic material from sitting under trees for so many years
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1997 Chevy c3500 6.5L 273k
5-spd NV4500, 4.10, 5T-elecDump flatbed Pensacola Diesel IP '18 , PMD relocate (duh), stock truck.

1994 Chevy C3500 HD 6.5L 175K, 4L80E, 4.63 Dana 80, 34'ish bucket (sunk in wet ground for 10+ yrs, dead due to PO attempts to repair , still hope). PO actually removed optic sensor and intake manifold to (I assume) spray starting fluid in, and after failing to start, gave up and left IP and engine OPEN for 10+ yrs. Walnuts and mouse doody down in around the valve stems in every port! Lots of cleaning. Be funny if it runs worth a darn.

Waynesburg, PA (near Morgantown, WV+ WVU)
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Old 03-23-2020, 09:13 PM   #4 (permalink)
heymccall
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Post #19 here...left unchecked, yes, it will flood the floor pan.
https://www.dieselplace.com/forum/63...ing-truck.html
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