heater sucks, need some help
Thread Starter
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Senior User
Joined: Mar 2003
Posts: 175
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heater sucks, need some help
92 f150 with I6-300 and 5 spd
The heater just takes forevery to warmup. It never blows hot. maybe luk warm.
The temp guage moves so I know the engine is warming up. although it takes it a while.
Any ideas to keep me from freezing?
thanks
The heater just takes forevery to warmup. It never blows hot. maybe luk warm.
The temp guage moves so I know the engine is warming up. although it takes it a while.
Any ideas to keep me from freezing?
thanks
Laughing Gas
Joined: Jan 2008
Posts: 751
Likes: 0
From: NC
It shouldn't take more than 7-8 minutes of driving to warm up to the "Normal" range. Flush the coolant with one of those kits, as you may have some restrictions keeping your heat from working well.
You may need to replace the thermostat if it is running too cool.
You may need to replace the thermostat if it is running too cool.
Postmaster
Joined: Sep 2008
Posts: 2,995
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From: raymond alberta
id check the heater core to make sure its not plugged before i started throwing parts at it...if its plugged you can get away with removing it and blowing it out with compressed air and a blow gun, just be carefull not to damage the core in the process
you could also try flushing the heater core while you have it out, could be internally clogged as well
you could also try flushing the heater core while you have it out, could be internally clogged as well
Thread Starter
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Senior User
Joined: Mar 2003
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Ok I will try to blow the heater core out. replaced the thermostat already. This pickup had sat for a couple year when I bought it. It did not have any antifreeze/coolent.
Should I take the heater core all the way out? If so should I drain all the antifreeze out? So I do not make a huge mess.
thanks
Should I take the heater core all the way out? If so should I drain all the antifreeze out? So I do not make a huge mess.
thanks
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
I gotta disagree with that, all of my trucks have had oustanding heaters. No need to remove the core to flush it just remove the heater hoses at the firewall and force some water through there with a garden hose. But it's more likely there is something in the blower box that is preventing the diverter door from completely closing and thats why the heat is poor. To get inside it remove the glove box and then the the rear cover right behind it and you'll have full access to all these parts.
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Tuned
Joined: Apr 2007
Posts: 372
Likes: 14
From: Central Minnesota
I tend to agree with Paul O. The heaters are excellent. On the farm here, it's real easy to get a nest of critters in there (air cleaner is a grand place also.......). Check your temp sensor with an ohm meter and you can easily see what the engine temp is getting up to, verify's the gauge anyway.
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Senior User
Joined: Feb 2007
Posts: 126
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From: Indianapolis
I'm also in agreement with Paul. My truck has been roasting me out of the cab for 11 years. Of course, I'm now fighting a heater issue, myself. And when I say now, I mean it- the flush is draining out as I type this. I have a thread going on my problem, too.
Freshman User
Joined: Jul 2009
Posts: 33
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I have an 88 f350 that we've had since new, I have changed the heater core probably 3 times, the first 2 caused from leaks, the last time poor heat transfer. I was able to purchase of all things a Harrison (GM) replacement for a great price, working great for 8 or 9 years. The original core lasted about 6 years and gave up about a year after the radiator core took a dump.
Postmaster
Joined: Feb 2003
Posts: 3,441
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From: Muskegon, MI (home)
Yeah I'll have to disagree with the Ford truck heaters not being that great. My 96 F150 will burn your hands if you hold them over the dash vents for too long. I used my defroster to warm up a frozen Hot Pocket (still in the packaging) from the gas station several times, took a little while to completely warm it up; but it worked! My 84 F150 would bake you out of the truck too, both trucks have 4.9s in them. The girlfriends 90 Ranger has awesome heat as well. My 84 F250 diesel has okay heat but it takes forever for that huge engine to warm up, I suppose the "tiny" 7 gallon cooling system might have something to do with it. I would first try flushing the cooling system and install a new thermostat.
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Senior User
Joined: Mar 2003
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I blew out the heater core. I have not yet drained it. One heater hose is hot and the other is luk warm. How much presure is to much. I do not want it to leak.
Looks like the down is moveing. Best I can tell.
thanks again
Looks like the down is moveing. Best I can tell.
thanks again
Elder User
Joined: Nov 2004
Posts: 684
Likes: 1
If one hose is hot and the other is only warm, then you have a restriction. Blow the water in the side that is "luke warm", this will back flush it giving you the best chance of blowing out the blockage.
Start the hose on low, as you increase power you will know when to stop.
Start the hose on low, as you increase power you will know when to stop.
Elder User
Joined: Nov 2004
Posts: 684
Likes: 1
IF one is hot and the other is warm, then you have a restriction. Put the hose in the "luke warm" side, this will back flush the system wich is the best chance for blowing out the blockage.
Start the hose on low power and slowly increase, you will know when to stop.
I have done this with many heater cores, the only ones that leaked afterwards were the ones that were really coroded and bond to start leaking anywase.
Start the hose on low power and slowly increase, you will know when to stop.
I have done this with many heater cores, the only ones that leaked afterwards were the ones that were really coroded and bond to start leaking anywase.