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Members,
Another heater box question!
On my 65 f 100, the heater box has a tube that connects to a port in the passenger side kick panel.
I am trying to figure out where that air comes from? Is it coming in from the engine compartment, or from the front tire wheel well? I feel like I smell “ engine compartment “ smells ever so faint, but there is a smell. Definitely NOT exhaust fumes! Exhaust is new, heater box was removed and redone. My last thread was excessive heat in the cab, that issue was corrected.
thanks!
On the outside of the truck at the base of the windshield is a series of parallel slots - that is where most of the air that reaches the inlet connector for the heater comes from. There are drains for that area on either side of the truck so some air would come from those drains as well, but probably not as much as comes from the slots below the windshield.
On the outside of the truck at the base of the windshield is a series of parallel slots - that is where most of the air that reaches the inlet connector for the heater comes from. There are drains for that area on either side of the truck so some air would come from those drains as well, but probably not as much as comes from the slots below the windshield.
So, in theory, if the heater box was removed, and the kick panel port wasn’t blocked off, it would allow fresh air into the truck and not contaminated air from the engine compartment?
Some other places to check - Ford didn't do too good of a job sealing up the cabs especially in the area of the firewall right behind the engine. The choke and speedometer cables come through those holes that are about 5 times too big for the purpose. Originally the cables had a foam sleeve on them that slides up and down the length of the cable. It's supposed to go in that hole in the firewall so once they got the cable situated and connected then they'd slide the foam sleeve as needed to fill the hole.
Here's an example speedometer cable. The longer foam piece is actually there to cushion the casing where it passes under the floorboard (on the passengers side in this case as it's an MX-COM cable) and then the shorter piece to the left is the one that slides to fill the hole in the firewall where the cable goes through.
The choke cable would have had a similar foam sleeve as shown circled in red in the drawing below.
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And you may have one but if the seal just in front of the parallel slots under the hood - the Cowl Seal - if it's not there or is cracked badly then installing a new one can help with smells going under the back edge of the hood and into the cowl vents. Also making sure the back edge of the hood is in contact with that seal would be a good check.
And along the back edge of the fender on both sides is a seal that helps keeps some of that from reaching the drains as easily since moving air would push down and past the seal I'd think. The link seems to have a problem so search on fender seal and narrow the search to 1966 trucks.
