Moisture on windows

[Mikes91]

It's been pretty wet and cool here in Monterey, lately, and the truck's been getting lots and lots of moisture condensing inside the cab. Takes no time at all for this to happen if the truck is warm... takes forever for it to go away even with the defroster on.

The carpet is dry... no leaks. I just cleaned both drains behind the front quarter panels earlier this year.

Is this kind of moisture normal for these old trucks when sitting out overnight in moist/cool conditions?

 

[jlayne]

roll the window down while your parking


my 81 does the same thing and it is a leaky windshield... it takes very little moisture to make one fog up.... you should also check the heater core and door/window rubbers... they get old and shrink so it might not leak enough to make a wet spot but it might let in enough moisture to fog the windows

 

[Mikes91]

roll the window down while your parking


my 81 does the same thing and it is a leaky windshield... it takes very little moisture to make one fog up.... you should also check the heater core and door/window rubbers... they get old and shrink so it might not leak enough to make a wet spot but it might let in enough moisture to fog the windows

Doh! How can I check the heater core?

Thanks again,

Mike

 

[highest_vision]

How can I check the heater core?

Do you smell any coolant/honeyish smells in the cab? Windshield ever fog up for no reason? Pull the glovebox liner out, and warm the truck up. Is the core bulging? All are signs of a failing core. Of course once it starts leaking onto the floor, its failed
Good Luck
James

 

[jlayne]

Doh! How can I check the heater core?

Thanks again,

Mike

if a 91 is like the 95 i replace a core in, if you remove the glove box you will see the heater box and it will have a access panel to get to the core with about 6 screws in it... remove that cover and the heater core is right there... feal around on it and see if she is wet if it is all you have to do is take the hoses off under the hood and one more screw and its out

the truck i fixed didn't leave a puddle in the floorboard but fogged the windows like you said... it wasn't leaking anymore than to leave a little puddle in the heater box... but it did smell like syrup (antifreeze) pretty heavy in the truck

 

[The Warden]

Doh! How can I check the heater core?

Shameless plug take a look here...the '87-'91 trucks should be similar.

If that's not it and you find the cause, I'd love to hear what it was...I've had the condensation problem the entire time I've had the truck (OTOH, I think my rear window now leaks )...

 

[Dsl_Dog_Treat]

You must be registered for see images

Have the same issues but we get some temp vairations due to winter. No brainer there, but Goldie also gets a little extra moisture pickup with the drivers floor pan having a few holes rusting thru. Till spring they can grow all they want but afterwards a few new pieces of sheet metal tacked into place

You must be registered for see images

should solve it.