seanhan Posted December 9, 2006 Report Share Posted December 9, 2006 Hey my 1994 fleetwood heater is on the fritz... blower is working good but only blows semi warm air, even after 30 min a freeway speed's.. I replaced the thermostat , That was not the problem.. Do you thing I should get the cooling system power flushed and replace the coolent.. The car only has 40K miles and my have the factory collent.... Thanks for any advice.... Link to comment Share on other sites More sharing options...
BodybyFisher Posted December 9, 2006 Report Share Posted December 9, 2006 First make sure that your coolant level is good. Flush out your heater core, flush in both directions until it runs clear and you get a strong stream in both directions. If you can determine which direction the heater flows in, reverse flush first. Be careful not to damage the heater core connections, if it is possible to flush from a hose up the line without disturbing the connctions at the heater core do that, the heater core connections are hard to get at and if you are too rough you can damage the heater core so its beat not to mess with those connections. Flushing the core will make a big difference and you should have better heat Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted December 9, 2006 Report Share Posted December 9, 2006 Factory coolant in a 12 year old car! Definately drain it and flush the core. Infact in your case I would flush the system. Link to comment Share on other sites More sharing options...
BodybyFisher Posted December 9, 2006 Report Share Posted December 9, 2006 Factory coolant in a 12 year old car! Definately drain it and flush the core. Infact in your case I would flush the system. Good Point Ranger I did not see that, I was focused on the heat. That car has green also, corrosion protection is 2 years / 24,000 miles OMG.... Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted December 9, 2006 Report Share Posted December 9, 2006 The Fleetwood's heater core is very easy to flush - the fittings are quick disconnect type and you can remove one of the hoses at the thremostat housing. Flush the core as described in the earlier posts. I would then drain the entire system and install new coolant mixed 50/50 with distilled water. Remove the knock sensors to drain the block - you will then get all the old coolant out. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
What job Posted December 10, 2006 Report Share Posted December 10, 2006 The Fleetwood's heater core is very easy to flush - the fittings are quick disconnect type and you can remove one of the hoses at the thremostat housing. Flush the core as described in the earlier posts. I would then drain the entire system and install new coolant mixed 50/50 with distilled water. Remove the knock sensors to drain the block - you will then get all the old coolant out. Does the Fleetwood have the same engine as the SLS in 94? If so I may have missed some thing in that when I replaced the knock sensor in the 94 SLS no coolant came out of the hole. Not even a drop. Does this mean the block in the one I have is plugged? Link to comment Share on other sites More sharing options...
KHE Posted December 10, 2006 Report Share Posted December 10, 2006 The Fleetwood's heater core is very easy to flush - the fittings are quick disconnect type and you can remove one of the hoses at the thremostat housing. Flush the core as described in the earlier posts. I would then drain the entire system and install new coolant mixed 50/50 with distilled water. Remove the knock sensors to drain the block - you will then get all the old coolant out. Does the Fleetwood have the same engine as the SLS in 94? If so I may have missed some thing in that when I replaced the knock sensor in the 94 SLS no coolant came out of the hole. Not even a drop. Does this mean the block in the one I have is plugged? The Fleetwood has the LT-1 350 cu-in engine - completely different from the Northstar. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
BodybyFisher Posted December 10, 2006 Report Share Posted December 10, 2006 1994 CADILLAC FLEETWOOD All Fleetwoods were powered by the GenII 5.7-liter V-8 with sequential port fuel injection and the new Opti-Spark ignition system. The 1994 Cadillac Fleetwood rewards you with a new 5.7 litre V8 that generates 260 horsepower and, with 335 lb.-ft. of torque, produces prodigious highway passing and the ability to tow large trailers and boats. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Cadillac Jim Posted December 10, 2006 Report Share Posted December 10, 2006 Corrosion in the coolant is probably what is clogging the heater core. The reverse-flush of the heater core, a radiator and block flush, and fresh 50-50 coolant should do the trick. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
KHE Posted December 10, 2006 Report Share Posted December 10, 2006 Given that the car's cooling system has been severely neglected, I'd backflush all components of the system. You may need to remove the thermostat but it is probably due for replacement anyway. The thermostat is not in the conventional location (on top of the intake manifold) but down low in a separate housing. Once you backflush the system, remove the knock sensors to drain the block, replace the thermostat, fill the system with fresh green coolant mixed 50/50 with distilled water and you should have plenty of heat. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
GreenMachine Posted December 10, 2006 Report Share Posted December 10, 2006 Would coolant tabs be an use on thise engine? Since it was neglected I'm guessing nuisance leaks would become a concern. The Green's Machines 1998 Deville - high mileage, keeps on going, custom cat-back exhaust 2003 Seville - stock low mileage goodness! 2004 Grand Prix GTP CompG - Smaller supercharger pulley, Ported Exhaust Manifolds, Dyno tune, etc 1998 Firebird Formula - 408 LQ9 Stroker motor swap and all sorts of go fast stuff Link to comment Share on other sites More sharing options...
KHE Posted December 10, 2006 Report Share Posted December 10, 2006 Would coolant tabs be an use on thise engine? Since it was neglected I'm guessing nuisance leaks would become a concern. It's OK to use the coolant supplement tabs in that engine. The nuisance leaks you refer to are not due to neglect but porosity in the aluminum castings. The Fleetwood's engines are cast iron though. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Cadillac Jim Posted December 11, 2006 Report Share Posted December 11, 2006 Nothing in this world is pefect. Use the sealant tabs as recommended by GM for coolant changes on this car. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
corkyd Posted December 12, 2006 Report Share Posted December 12, 2006 If there is a vac switch/control valve in the heater hose.. and that has failed, you wont get heat. Similarly, in the summer if the valve failed open.. you get all your A/C warmed up.... Link to comment Share on other sites More sharing options...
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