No Heat
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Senior User
Joined: Sep 2007
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No Heat
O.k. I have a 1990 F-150 XLT 4x4 ext cab, it doesn't throw much heat, if I leave it idle in the driveway it throws enough heat to notice a temp difference when you hop in but once you are driving it cools down. I have replaced the thermostat, I checked the coolant and it's good. This truck is listed as having the "super cooling" package. could this be the cause? Should I put in a single core rad?
any ideas would be great.
any ideas would be great.
Elder User
Joined: Jan 2004
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From: Afton NY
what did you put for a t stat? could try a hotter stat. could also experiment puting cardboard in front of radiator, if it overheats put less cardboard, with diesels we have to do that esp in cold weather
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I actually have cardboard in front of the rad now, The thermostat is a standard Canadian Tire run of the Mill T-stat.
The Temp guage may not be correct but it only ever goes to the N in NORMAL.
This is my first winter with this truck and with our cold temps here like today at -40 its a little hard to stay comfortable in a truck with no heat.
The Temp guage may not be correct but it only ever goes to the N in NORMAL.
This is my first winter with this truck and with our cold temps here like today at -40 its a little hard to stay comfortable in a truck with no heat.
Postmaster
Joined: Sep 2004
Posts: 3,166
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From: wi
my 96 does the same thing but the temp gauge goes up about 1/4 the way into normal so i checked the hoses and they nice and toasty warm.seems as if the temp control on the heater conrol panel isnt working rite,if i remember rite these are vacume operated and real fun to change
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Joined: Jan 2004
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From: Afton NY
-40 ? screw that, go in the house and stay there till it warms up, outside, my truck won't even turn over in -40 so your doin better than me. no really if i come up with somethin i'll let you know. maybe a 210 degree stat or do what you thought and put a smaller radiator in
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Posting Guru
Joined: Mar 2007
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From: Florida
unhook the hoses put a garden hose up to it and try to flush it out or backflush it.....it's nothing to change them out drop the glovebox open the black box and bam she's there...really simple......Luck
JR
JR
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From: Belle Mead NJ
Ive had good luck with Preston Flush, but -40 is way too cold to be messing with that. Unless you have a heated garage. Just remember if the coolant system hasnt been taken care of, flushes and such and cause leaks.
Elder User
Joined: May 2007
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From: Solon, Ohio
Originally Posted by ozzy460
-40 ? screw that, go in the house and stay there till it warms up, outside, my truck won't even turn over in -40 so your doin better than me. no really if i come up with somethin i'll let you know. maybe a 210 degree stat or do what you thought and put a smaller radiator in
For all practical purposes only the thermostat affects the ability to heat up, by regulating how much coolant is circulated through the radiator.
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well once the weather warms up I will remove the heater core and try flushing it.
Are there any recomendations as to how to flush it, or what type cleaner to use? would "CLR" or other Calcium lime and Rust cleaners work?
Are there any recomendations as to how to flush it, or what type cleaner to use? would "CLR" or other Calcium lime and Rust cleaners work?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by handsomerob
So disconnect both heater hoses and force water through it? or remove it and force water through it?