Heater problem ( help ) - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 10-24-2011, 04:15 AM Thread Starter
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Angry Heater problem ( help )

Heater doesn't blow hot in the cab here's what
I have done and checked out!
Hot and cold switch works the door under the dash
On passenger side moves like it should .
Select for vent,mix,floor ect work when truck is running
Took heater motor out cleaned evaporater coil fan blows
Great .
Heater core hoses are to hot to touch on both in and out
Took heater core panel off on inside to hot to touch it blows hot out
Of bottom of heater core but no were else the hottest it gets is
90 deg . When truck is hot , this started last year of course it's getting
Cool so !!!
Any and all tips or ideas would be great
Thanks
Threestud

97 f 250 4*4 auto 7.3 4 '' ,pipe , chipped,306,480 and counting
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post #2 of 15 (permalink) Old 10-24-2011, 07:33 AM
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Re: Heater problem ( help )

I have a similar problem but you have diagnosed more than I have. Mine is slightly different though. It will work great sometimes, then sometimes you switch it on and you can hear it blowing but no air from anywhere. Sometimes it blows super hard on the low setting and no harder as I switch it up. I'm baffled!

1995 F-250 7.3L 5 Speed, 4" Lift, 35" Toyos, Straight Pipe, DIY 6637 Intake, TS Chip with PHP Tunes, Glowshift Gauges
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post #3 of 15 (permalink) Old 10-24-2011, 10:57 AM
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Alrighty....

So my guess:

If you have inspected the core for any debris that may be blocking it on the outside, then I think maybe your core has a blockage internally.

You can back flush it and see if that solves your problem.

Connect a female garden hose adapter to the outlet (Water pump side), and disconnect the other hose from the block. Hit it with full pressure for at least five minutes. You can turn it on and off a couple times to help dislodge any crud that might be stuck in there.

When you're done, leave the water pump side (Outlet) disconnected and start the truck. Wait until you have a steady stream of coolant out of that hose, then reconnect. This will bleed all of the air out of the core.

As usual, don't stick you digits in any moving parts, and be environmentally conscience!

LiftedSuzuki, your problem seems like it could be a vacuum or electrical issue.

Hope this helps! Make sure to let us know!
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post #4 of 15 (permalink) Old 10-24-2011, 01:10 PM Thread Starter
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Re: Heater problem ( help )

I will give it try

97 f 250 4*4 auto 7.3 4 '' ,pipe , chipped,306,480 and counting
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post #5 of 15 (permalink) Old 10-24-2011, 04:04 PM
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Re: Heater problem ( help )

Thanks

1995 F-250 7.3L 5 Speed, 4" Lift, 35" Toyos, Straight Pipe, DIY 6637 Intake, TS Chip with PHP Tunes, Glowshift Gauges
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post #6 of 15 (permalink) Old 10-24-2011, 10:59 PM
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Re: Heater problem ( help )

Vacuum lines?
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post #7 of 15 (permalink) Old 10-25-2011, 12:25 AM
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Yup Vacuum lines.....

The only reason these trucks have a vacuum pump is for the brake booster and the HVAC controls. He'll have to verify what is and isn't working.

Any more questions?

Ciao,

Lawrence
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post #8 of 15 (permalink) Old 10-25-2011, 02:41 AM Thread Starter
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Re: Heater problem ( help )

Flushed as said above and rust and some
Crud came out , back flushed from block side
No change in temp ! So started over this time in hooked
Both lines flushed core and filled with CLR for 10 min
Flushed again tons of crap came out .installed
Hoses and now I've gained 10 deg . So with this
I'm going to just swap out the core it's clear , it's the problem
So I will up date , when I get it swapped out!

97 f 250 4*4 auto 7.3 4 '' ,pipe , chipped,306,480 and counting
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post #9 of 15 (permalink) Old 10-25-2011, 02:53 AM
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Re: Heater problem ( help )

Fill the heater core with CLR and let it set for about a hour, it that doesnt work I think it may be time for a new heater core.

2015 Challenger HellCat Redline Red 8sp
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1986 F350 CC Dually 6.9 ATS turbo lowered
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post #10 of 15 (permalink) Old 10-25-2011, 03:45 AM
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Re: Heater problem ( help )

Is there any chance you could write in paragraphs, instead of putting in those line breaks and capitals randomly? They don't make any sense, and make your posts look like poems, and they're very hard to read.
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