Quick cooling questi
Quick cooling questi my buddy has a 95 z28 the car was running hot, so we changed the thermostat and water pump, it works great when turn the AC on or the heat. i am thinking the fans are not coming on like they should. where should i start? I am an LS1 guy so Lt1's are not my thing, i am trying to help a friend save money. thanks chris
TECH Veteran
Joined: Dec 2008
Posts: 4,147
Likes: 62
From: Little Rock, AR
my buddy has a 95 z28 the car was running hot, so we changed the thermostat and water pump, it works great when turn the AC on or the heat. i am thinking the fans are not coming on like they should. where should i start? I am an LS1 guy so Lt1's are not my thing, i am trying to help a friend save money. thanks chris
Stock fans don't come on until 226°. if the heat is on the car runs fine BUT DOES NOT blow hot air!!!! thermostat opens in boiling water. there is a new water pump on the car. i had my computer on it and it was climbing up to 220 then we shut it off. i am lost. help!!!
Launching!
Joined: Feb 2009
Posts: 280
Likes: 0
From: bodymore
flush heater core to restore hot air flow back! hell, flush the whole damn system. its rated at 18 psi so dont put moe than that in water inside or youll break stuffs lol
does it bubble up and gurgle over the recovery tank? maybe try bleeding it - the car had work done before i bought it and didn't get bled properly, and it would overheat. The fans come on at a very high temperature, 226F for slow and 235F for high..these cars regularly run, 220-230s. any DTCs? check the coolant temp sensor, in the driver side head, make sure that isnt showin the gauge as being too hot or cold or w/e. the temp sensor in the water pump controls the pcm temp reading
this is the best site for LT1 cars: Shoebox (he's on here forgot his user name though) wrote a big site up about all LT1 F bodys
http://shbox.com/1/4th_gen_tech2.html#cooling for the cooling aspect
does it bubble up and gurgle over the recovery tank? maybe try bleeding it - the car had work done before i bought it and didn't get bled properly, and it would overheat. The fans come on at a very high temperature, 226F for slow and 235F for high..these cars regularly run, 220-230s. any DTCs? check the coolant temp sensor, in the driver side head, make sure that isnt showin the gauge as being too hot or cold or w/e. the temp sensor in the water pump controls the pcm temp reading
this is the best site for LT1 cars: Shoebox (he's on here forgot his user name though) wrote a big site up about all LT1 F bodys
http://shbox.com/1/4th_gen_tech2.html#cooling for the cooling aspect
TECH Enthusiast
Joined: Mar 2009
Posts: 680
Likes: 8
From: Clearwater
Trending Topics
ok guys i know this is old but he still hasnt fixed it. so i was reading on here about the heater core and how to check it. so we cranked the car up and drove it around let it get warm and the turn the defroster on but as stated above it just blows cold. so i popped the hood and then touched the hoses going into the firewall and they are cold!!! so to make sure i am right THAT means that the heater core is clogged??? thanks for any help
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
yup very common and the other thing that clogs all the time is the steam pipe on the back of the engine. If the coolant cant travle to the heater core the hose will never get hot. If you still read hot on the gage it is the steam pipe as well. The steam pipe is a big old bitch to deal with so start with the heater core and hope thats it.
yup very common and the other thing that clogs all the time is the steam pipe on the back of the engine. If the coolant cant travle to the heater core the hose will never get hot. If you still read hot on the gage it is the steam pipe as well. The steam pipe is a big old bitch to deal with so start with the heater core and hope thats it.
The steam tube goes to the radiator, while the heater core hoses go to (and from) the water pump. 
