FBGSU02

iTrader: (6)

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

fleetmgr

I'm not clear on when it's getting hot. It overheats with the A/C on, or no. Going down the highway at speed or no?

shbox

I'm thinking you should tell us what temp you are thinking they should come on. Stock fans don't come on until 226°.

FBGSU02

iTrader: (6)

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!!!

trippinholyman

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

stevo9389

see post #3 for his screenname, lol

trippinholyman

I thought so but wasn't sure and didn't read the names, just what they said in response

FBGSU02

iTrader: (6)

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

jaycenk

iTrader: (1)

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.

RamAir95TA

iTrader: (2)

What does the steam tube have to do with the heater core? The steam tube goes to the radiator, while the heater core hoses go to (and from) the water pump.

jaycenk

iTrader: (1)

nothing. It's just something else that seems to clog quit easy.

LT1

iTrader: (1)

Sounds more like your not getting coolant flowing threw your heater core, id have that checked out.

FBGSU02

iTrader: (6)

Thanks guys I will keep you poste if this fixes the problem, if not I will return for other options.