Clutch fan or block off radiator air flow?

RufusTheDufus · 01-16-08, 09:34 PM

I've got an 82 BJ42 that seems to not want to warm up. I don't have a water temp gauge on it yet so my observations are only based on the dash gauge and the seat of the pants meter.

It's pretty cold here lately. Overnight temps are single digit F with highs around 25 - 28 degrees F. I get very little heat into the passenger area no matter how far I've traveled. 25 miles on rural roads going 25 - 50 MPH and it's still cold. Cold enough that I need to scrape the ice off the inside of the windshield from my breathing.

The engine has a solid fan spacer. I have a clutch fan available. I'm wondering if my first step should be to block off air flow to the radiator or install the clutch fan?

I haven't changed the thermostat yet though I do have one on order. These are the only things I can think of to get any usable heat into passenger area.

Gold Boy · 01-16-08, 09:43 PM

1st you need a heat gauge! [walmart

]

partial rad covering, always leave some space for air flow. my bj74 came with a stock rad cover.

new t-stat, will probably resolve the issue.

i run a solid fan and my 13bt will heat up at -20c.

lynchmob · 01-16-08, 10:25 PM

t-stat is likely the issue.

Big Blue 84BJ60 · 01-17-08, 10:00 PM

i had the same problem the first winter i had my truck here in canada the problem was the heater cores were all plugged up with thick brown sludge i back flushed the cores and now i get nice warm heat (too warm to wear a coat or sweatter on full) clogged heater core (similar to a rad) might be the problem on older trucks this shit happens

RufusTheDufus · 01-18-08, 08:48 AM

I think I'll try flushing the heater core when I do the t-stat change. I'm planning to install the mechanical water temp gauge at that time as well.

01-16-08, 09:34 PM	#1
RufusTheDufus IH8MUD Regular Join Date: Jan 2008 Location: Maine Posts: 289	Clutch fan or block off radiator air flow? I've got an 82 BJ42 that seems to not want to warm up. I don't have a water temp gauge on it yet so my observations are only based on the dash gauge and the seat of the pants meter. It's pretty cold here lately. Overnight temps are single digit F with highs around 25 - 28 degrees F. I get very little heat into the passenger area no matter how far I've traveled. 25 miles on rural roads going 25 - 50 MPH and it's still cold. Cold enough that I need to scrape the ice off the inside of the windshield from my breathing. The engine has a solid fan spacer. I have a clutch fan available. I'm wondering if my first step should be to block off air flow to the radiator or install the clutch fan? I haven't changed the thermostat yet though I do have one on order. These are the only things I can think of to get any usable heat into passenger area. Last edited by RufusTheDufus; 01-16-08 at 10:10 PM. Reason: poor speelling

01-16-08, 09:43 PM	#2
Gold Boy it's a wooly worm Join Date: Aug 2005 Location: Southern Interior, BC, Canada. Posts: 1,608 Blog Entries: 1	1st you need a heat gauge! [walmart ] partial rad covering, always leave some space for air flow. my bj74 came with a stock rad cover. new t-stat, will probably resolve the issue. i run a solid fan and my 13bt will heat up at -20c. __________________ BJ74 & TUFT & U-AFPT

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01-16-08, 10:25 PM	#3
lynchmob Diesel Trucker Join Date: Mar 2007 Location: Portland OR - USA Posts: 1,009	t-stat is likely the issue.

01-17-08, 10:00 PM	#4
Big Blue 84BJ60 IH8MUD Regular Join Date: Aug 2007 Location: brampton ont Posts: 252	i had the same problem the first winter i had my truck here in canada the problem was the heater cores were all plugged up with thick brown sludge i back flushed the cores and now i get nice warm heat (too warm to wear a coat or sweatter on full) clogged heater core (similar to a rad) might be the problem on older trucks this shit happens

01-18-08, 08:48 AM	#5
RufusTheDufus IH8MUD Regular Join Date: Jan 2008 Location: Maine Posts: 289	I think I'll try flushing the heater core when I do the t-stat change. I'm planning to install the mechanical water temp gauge at that time as well.