Over heating
 

Hi guys and girls I need help i have a 95 lti 85,000. just replaced serpentine , t stat , water pump , rad cap , plugs , wires and opti she's overheating we bled the system I have no heat and shes red after about 2 minutes where should I look next ?
Thanks in advance S

Re: Over heating
 

What method did you use to bleed the system?

Re: Over heating
 

Sounds like the system still has air in it because of the no heat issue. Can you hear air bubbles at the radiator/cap after you shut it down?

Re: Over heating
 

I used the two bleeder screws it's bubbling like a2gr said so I'm bleeding it again and it's a lot of steam and air coming out hopefully that does it

Re: Over heating
 

I open just enough to get the smallest amount of air and water out and run until there is just straight water for a bit. Make sure you use a towel and don't let the coolant drip down. Once you get it, its pretty obivious.

Re: Over heating
 

Well did that yesterday it seemed promising but same results does anyone have an idea on the heat core Maybe I heard you can run water through it to see if it's blocked this car hasn't had heat for a very long time 3+ years and always over heated in summer or stopped at a long light ? Thanks again S

Re: Over heating
 

I have had trouble with bleeding before. Take a hose off of the highest point and fill the car with water till water starts to come out of the disconected hose. then reconect top it off and try to blled it again, you may have a large pocket of air trapped that the nromal bleeding technique is not moving

Re: Over heating
 

If you haven't done this already, when you run the car, make sure you have your heat all the way to hot and fan on high. This will make sure the coolant flows thru the heater core and gets any air out.

Re: Over heating
 

Thanks for your help have to move on and check the head gasket ??? I heard it has aluminum heads is that a good thing??

Re: Over heating
 

Aluminum heads are good performance wise as opposed to the stock LT1 iron heads.....but you should check the oil for milkshake. If it has milkshake, then you need new head gaskets. If I were you, I would disconnect the feed/return lines for the heater core, and run a garden hose into the feed line to make sure there is no blockage.

Red arrows means feed line, blue arrows is return
http://shbox.com/1/heater_hoses_93-94.jpg

Re: Over heating
 

Thanks Ryan I'll check today and hope it helps

Re: Over heating
 

Ok so I have done almost everything I can think of next is the radiator I have done some extensive bleeding over and over no milkshake so any idea on what next I also bypassed the heater core thanks Shannon

Re: Over heating
 

Are you getting flow through the radiator. You said you replaced the water pump is it flowing, you didnt forget the wp coupling did you?

Re: Over heating
 

My brother in law did the pump he's a real mechanic I'm not so sorry to say but is there a way I can tell if he did it or not

Re: Over heating
 

The coolant system in the LT1 is set up to flow coolant through the heater core all the time. There is no shutoff valve in the system. Turning on the heater will remove heat from the coolant that is already flowing, but it won't change the coolant flow, and it won't help eliminate the air.