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| Technical Info: 2nd Gen 12 VALVE DRIVETRAIN Technical discussion of second generation (1994 - 1998) 12-valve engine and drivetrain questions, solutions and upgrades. |
02-04-2010
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Member
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Join Date: Jun 2007
Location: north carolina
Posts: 82
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Why wont my truck make heat
Just this winter my truck has stoped making heat. The temp guage just barely gets into the operating range and the heat out of the vents is luke warm at best. If Ive been in it and the engine is as hot as its gonna get, if I turn the heat on it will blow a little hot air at first but then returns to luke warm. Ive done the thermostat twice, and even tried card board over the radiator, still didnt get hot????? Even puling a load the water temp never gets any where close to 180 and the heat sucks.
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98 12v, 4x4, nv5600, 16.5*, 0 plate, custom AFC, 3k GSK, 370 inj, 16 cm housing, ARP studs, O-ring Head, AFE Intake, 60lb valve springs, Bd exhaust brake, 4" exhaust, Guages, 265,000 miles of hard work. New custom high idle in cig lighter hole. cool down timer.
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02-04-2010
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Administrator
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Join Date: Mar 2005
Location: Calgary, AB
Posts: 6,645
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Sure sounds like you still have Tstat issues if it isn't coming up to temp under load. May want to try a new rad cap as well. However with that being said the heaters in these things just plain suck, i freeze in mine all winter long and minedoes come up to temp.
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'96 2500SLT CC LB 2WD, KDP tabbed,100Hp Maxsticks,16* ,3k gsk,afc modded,#8 tst plate,62/70/13 turbo,4" MBRP exhaust,AFE stage III dry filter intake,autometer boost pyro, oil, tran temp,DSS,rebuilt diff & tranny w/billet triple lock TC w/lockup switch,1tn rear cylinders,ride rites on all 4 corners w/on board air,450k km. 330 hp 766 ft/lbs( before maxsticks)
'05 Westwind 24' 5er
'06 Polaris sportsman 500HO
Clownular unit Beta of 2Clowns Inc.
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02-05-2010
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Member
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Join Date: Jun 2007
Location: north carolina
Posts: 82
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I know the heaters arnt great, but it used to get hotter than it is now. And my sisters truck gets really hot.
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98 12v, 4x4, nv5600, 16.5*, 0 plate, custom AFC, 3k GSK, 370 inj, 16 cm housing, ARP studs, O-ring Head, AFE Intake, 60lb valve springs, Bd exhaust brake, 4" exhaust, Guages, 265,000 miles of hard work. New custom high idle in cig lighter hole. cool down timer.
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02-05-2010
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Administrator
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Join Date: Jan 2003
Location: Arbutus,Maryland
Posts: 9,650
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Did you use aftermarket t/stats, or get it from Cummins? Not to be smart, is it installed the right way because they can be installed backwards.
Couple of other things...it could be the core plugged up, could be the water pump not circulating the coolant. If you drained it all the way down when you replaced the t/stats, could also be an air pocket in the system.
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2000QC,SLT,SB,4x4,Intense Blue,Auto,4.10,DSS,AFE Megacannon PRO GUARD-7,silencer ring MIA,Edge Comp-pump wire untapped,Rip's 4in Fair Shake Exhaust,Isspro EVs fuel,boost,pyro,FASS 95/150, S/S '03 trackbar bracket, Thuren '03 trackbar, HTS Ultimate Duty trans w/ billet input & output, 89% Suncoast convertor, 150HP MAXsticks
'06 Liberty CRD, Inferno Red Crystal Pearlcoat, GDE ECO tune
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02-06-2010
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Member
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Join Date: Jun 2007
Location: north carolina
Posts: 82
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Yea i did the t stat twice. because i thought it might have been in wrong. Bith were cummins parts. As far as I can tell its in the right way. Has an arrow saying this side to radiator (if i remember correctly) what role does the little check valve and line by passing the t stat play?
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98 12v, 4x4, nv5600, 16.5*, 0 plate, custom AFC, 3k GSK, 370 inj, 16 cm housing, ARP studs, O-ring Head, AFE Intake, 60lb valve springs, Bd exhaust brake, 4" exhaust, Guages, 265,000 miles of hard work. New custom high idle in cig lighter hole. cool down timer.
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02-06-2010
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Administrator
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Join Date: Jan 2003
Location: Arbutus,Maryland
Posts: 9,650
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The jiggle valve in the t/stat and the bypass line are mainly for an air bleed and just a way for a small amount of coolant to circulate.
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2000QC,SLT,SB,4x4,Intense Blue,Auto,4.10,DSS,AFE Megacannon PRO GUARD-7,silencer ring MIA,Edge Comp-pump wire untapped,Rip's 4in Fair Shake Exhaust,Isspro EVs fuel,boost,pyro,FASS 95/150, S/S '03 trackbar bracket, Thuren '03 trackbar, HTS Ultimate Duty trans w/ billet input & output, 89% Suncoast convertor, 150HP MAXsticks
'06 Liberty CRD, Inferno Red Crystal Pearlcoat, GDE ECO tune
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02-07-2010
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Member
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Join Date: Jun 2007
Location: north carolina
Posts: 82
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what about the fan, could that be causing the trouble?
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98 12v, 4x4, nv5600, 16.5*, 0 plate, custom AFC, 3k GSK, 370 inj, 16 cm housing, ARP studs, O-ring Head, AFE Intake, 60lb valve springs, Bd exhaust brake, 4" exhaust, Guages, 265,000 miles of hard work. New custom high idle in cig lighter hole. cool down timer.
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02-07-2010
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Administrator
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Join Date: Jan 2003
Location: Arbutus,Maryland
Posts: 9,650
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What fan are you referring to, the engine fan or the blower motor fan?
If the engine fan is staying engaged all the time, which is unusual, then that can cause an overcooling situation. If it is staying engaged all the time, you should be able to hear it.
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2000QC,SLT,SB,4x4,Intense Blue,Auto,4.10,DSS,AFE Megacannon PRO GUARD-7,silencer ring MIA,Edge Comp-pump wire untapped,Rip's 4in Fair Shake Exhaust,Isspro EVs fuel,boost,pyro,FASS 95/150, S/S '03 trackbar bracket, Thuren '03 trackbar, HTS Ultimate Duty trans w/ billet input & output, 89% Suncoast convertor, 150HP MAXsticks
'06 Liberty CRD, Inferno Red Crystal Pearlcoat, GDE ECO tune
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02-07-2010
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Senior Member
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Join Date: Feb 2004
Location: S.W. Mich.
Posts: 881
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you need to see if the engine is building heat or not.
do you have a hand held pyrometer? i always check the middle of the block and the cylinder head where there is coolant before the thermostat. then you can check the radiator and see if there is any heat there, just follow the heat.
check the inlet and outlet of the heater core hoses and see if there is a drop in temp or if any heat is going in the cab at all.
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1999 3500 4WD Quad cab. 4" exhaust, ATS exhaust manifold, Hypertecc programmer, Edge Jammer Stg 2 injectors, FASS 150/95, draw straw, Suncoast Transmission and converter, BHAF, ring?, DTT noise filter, pillar post gauges, low fuel pres warning lite, remote start, Black paint with chrome and stainless.
4WD record holding PSI D Screwcharged Sand Funnycar
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2001 3500 SLT 4WD Air Dog 150 with draw straw. Ring? MBRP 4", Quadzilla on the bench
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02-07-2010
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Senior Member
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Join Date: Dec 2004
Location: outside Duluth, Mn
Posts: 922
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I agree with checking the temp of the block to see what kind of heat it is producing. If the block is not getting warm then you need to concentrate on the thermostat as to why it will not let the engine get warm. It also sounds like you have another issue with the heater core itself. The core could be getting plugged up or there is a blockage of some sort not allowing full flow to the core.
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formerly member #555 '96 2500 2WD Goerends tranny, timing at 16.5*, Piers upgraded turbo,#100 fuel plate, 300 injectors, 365HP 833TQ, set up for 26' fiver with 16' boat behind that
http://www.midwestdieselconnection.com
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