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Old 11-19-2012, 09:51 PM   #1 (permalink)
JLanzino
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Cold Lower Rad Hose??

Hi All,

I replaced my block heater today on my 94 6.5, wasn't able to drain the rad so I did it the hard way, I drained the coolant from the block heater hole. I lost about 16L of coolant, I refilled it at the rad because it was empty, started up the truck up, it took for ever to get the top hose warm, but the reservoir never went down or looked to be circulating. The Temp was 85 to 90 degrees celsius so no over heating but the lower rad hose was cold as was the hose from the rad to the reservoir.

Is this normal, the water pump was changed last spring to my knowledge
__________________
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
Proud Member # 992 Of The 3500 Dually Club, # 40 Of The Old SOBs, # 117 The Regular Cab Club, Member Of The ODPC
Proud Fan Of The Montreal Canadiens

Last edited by JLanzino; 11-19-2012 at 09:55 PM.
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Old 11-19-2012, 09:54 PM   #2 (permalink)
racer55
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Takes quite a while for the lower rad to get hot from an idling engine and a stat that is only opening occasionally.
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96 Chevy C3500 Dually 6.5TD F Engine 4.11 Rear/5 Speed
Relocated PMD/Heatsink to Front Bumper #9 Resistor
K-47 Standard Duty AC Air Filter And K-47 Housing
Kennedy special calibration fan clutch/Kennedy 20" steel fan
LeroyDiesel.com oil cooler kit
Diamond Eye 4" turbo back exhaust
2 1/2" crossover
High Idle Mod
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Diagnostic Checklist 2.0
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Old 11-19-2012, 10:13 PM   #3 (permalink)
JLanzino
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So should I worry or just move on with life? Figuratively speaking
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1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
Proud Member # 992 Of The 3500 Dually Club, # 40 Of The Old SOBs, # 117 The Regular Cab Club, Member Of The ODPC
Proud Fan Of The Montreal Canadiens

Last edited by JLanzino; 11-19-2012 at 10:17 PM.
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Old 11-19-2012, 10:55 PM   #4 (permalink)
racer55
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Make sure all the air is bled from the cooling system and drive it keeping an eye on the temp gauge,if it's working properly it will let you know of a problem.

Getting all the air out is the most important thing,the gauge sending units are meant to be enveloped in coolant-they won't work if there is an air pocket around them so they can't warn you of a problem.
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96 Chevy C3500 Dually 6.5TD F Engine 4.11 Rear/5 Speed
Relocated PMD/Heatsink to Front Bumper #9 Resistor
K-47 Standard Duty AC Air Filter And K-47 Housing
Kennedy special calibration fan clutch/Kennedy 20" steel fan
LeroyDiesel.com oil cooler kit
Diamond Eye 4" turbo back exhaust
2 1/2" crossover
High Idle Mod
Feed The Beast 2.0
EGT,Boost gauges
Diagnostic Checklist 2.0
OBD1 Codes
OBD2 Codes
6.5 FAQ
Carcode & TDCO Instructions

Last edited by racer55; 11-19-2012 at 10:55 PM.
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Old 11-19-2012, 11:02 PM   #5 (permalink)
JLanzino
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what is the best way to bleed out all the air?
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1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
Proud Member # 992 Of The 3500 Dually Club, # 40 Of The Old SOBs, # 117 The Regular Cab Club, Member Of The ODPC
Proud Fan Of The Montreal Canadiens
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Old 11-19-2012, 11:07 PM   #6 (permalink)
racer55
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Open the bleed valve by the t-stat until coolant flows with the engine running,also leave the rad cap off until the stat opens and the upper hose gets hot and you can feel flow in the hose is how I do it.
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96 Chevy C3500 Dually 6.5TD F Engine 4.11 Rear/5 Speed
Relocated PMD/Heatsink to Front Bumper #9 Resistor
K-47 Standard Duty AC Air Filter And K-47 Housing
Kennedy special calibration fan clutch/Kennedy 20" steel fan
LeroyDiesel.com oil cooler kit
Diamond Eye 4" turbo back exhaust
2 1/2" crossover
High Idle Mod
Feed The Beast 2.0
EGT,Boost gauges
Diagnostic Checklist 2.0
OBD1 Codes
OBD2 Codes
6.5 FAQ
Carcode & TDCO Instructions
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Old 11-20-2012, 07:14 PM   #7 (permalink)
JLanzino
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Worked Perfect racer55, Thank you sir
__________________
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
Proud Member # 992 Of The 3500 Dually Club, # 40 Of The Old SOBs, # 117 The Regular Cab Club, Member Of The ODPC
Proud Fan Of The Montreal Canadiens
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Old 11-20-2012, 07:21 PM   #8 (permalink)
racer55
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No more strange temp readings?
__________________
96 Chevy C3500 Dually 6.5TD F Engine 4.11 Rear/5 Speed
Relocated PMD/Heatsink to Front Bumper #9 Resistor
K-47 Standard Duty AC Air Filter And K-47 Housing
Kennedy special calibration fan clutch/Kennedy 20" steel fan
LeroyDiesel.com oil cooler kit
Diamond Eye 4" turbo back exhaust
2 1/2" crossover
High Idle Mod
Feed The Beast 2.0
EGT,Boost gauges
Diagnostic Checklist 2.0
OBD1 Codes
OBD2 Codes
6.5 FAQ
Carcode & TDCO Instructions
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Old 11-20-2012, 10:32 PM   #9 (permalink)
Octane
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Quote:
Originally Posted by racer55 View Post
No more strange temp readings?

im interested in this verdict as well
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1995 Chevy 2500 6.5l Turbo Diesel w/ intake restrictions removed . Diamond eye 4" exhaust straight piped, HX40W-II turbo with a K&N 4" pod ( temporary), ARP head studs & new heads, injectors w/ pop @ 2300 psi, Buddy "3" banger chip, VIN F, Currently running 20# boost
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Old 11-20-2012, 10:42 PM   #10 (permalink)
mxz_583_1997
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I usually go for a ride with rad cap loose to make sure
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1994 GMC 1500 HD Z71 4x4 ext cab 6.5L TD,3.73 GEAR RATIO LIMITED SLIP POSITRACTION,4L80-E 4-SPD Lubrication Specialists oil lines,Transmission lines replaced with Hydraulic lines,pmd mounted on heat sink in bumper home made wiring harness all soldered greased and shrink tubed,gutted intake,tcc mod,380000kms
egr blocked off with intake gaskets,New heads May 2012,ARP head studs,2 1/2" cross over 3" down pipe 4" straight pipe

1998 k2500 Z71 ext cab 6.5 TD,stock exhaust,muffler delete soot trap gutted,4:10 gears,grey standyne pmd in front bumper,312000km,Lubrication Specialists oil lines,trannytemp,boost,EGT,fuel pressure gauges
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