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#1
09-12-2005, 12:53 PM
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99 Suburban - low engine temps
My 99 suburban only shows about 160 degrees on the guage even after replacing the thermostat. It seems like it used to read about 190.
For the longest time I was mysteriously losing coolant and wondered if the low temps were related. I am aware of the intake manifold problem with this engine and planned on doing that replacement. Just last week I was replacing the cap and rotor and happened to notice a residue trail from the quick connect heater hose located at 10 o'clock from the thermostat housing. I replaced the part between the block and the heater hose ($8 NAPA) and my leaking has stopped. Still, the engine temps do not get above 160 degrees. Any ideas? 
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#2
09-12-2005, 01:04 PM
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I had the same problem after doing the intake gaskets on my 97 GMC Suburban. I replaced the thermostat while I had it apart and it would only ready about 172 degrees. I went and bought a Stant brand 195 degree and it's been fine since. I guess I just got a bad one.
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1970 GMC 2WD shortbed fleetside 1984 Olds Delta 88 (won't die) 1997 GMC Suburban K1500 W/5.7L Vortec 2000 Dodge Ram 1500 4WD Shortbed Ext. cab 1998 Chevy K2500 W/5.7L Vortec 2002 Harley Custom Chopper Wife is a late 1951
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