hmdznrcld Posted July 23, 2009 Report Share Posted July 23, 2009 OK I need a little advice from those of you that have a DOHC. I have a 94 dohc engine running obd1, this engine is in my lambo replica. I am using two 14" griffen aluminum radiators with fans hooked up thru the ecm to come on at 210. When I start the car up I notice within one minute or so the water level in the overflow bottle starts to rise, is this normal? I also hear some slight "gurgling" sounds once the car is hot and I shut it off, I then will purge the small vent near the thermostat and nothing but steam comes out, but both rads show water at the bleeders. I am wondering if a higher "bleeder" is needed like the OEM, there is one on the firewall. I was thinking of adding one but not sure if it is really needed. I know I am rambling a little but I am trying to get all the stuff out so I can get the correct advise. Is there a special way to ensure I have no air pockets? Any help appreciated. THANKS Quote Link to comment Share on other sites More sharing options...
Andrew Posted July 23, 2009 Report Share Posted July 23, 2009 the overflow tank is still the high point in the cooling system right? Quote Link to comment Share on other sites More sharing options...
slick Posted July 23, 2009 Report Share Posted July 23, 2009 Yeah, you will probably want to add a higher bleeder, or get a pressurized overflow tank out of another GM vehicle. Since the system is rather large in that vehicle, I would try to have bleeders at all of the high points (radiators, hoses, and engine). Quote Link to comment Share on other sites More sharing options...
hmdznrcld Posted July 24, 2009 Author Report Share Posted July 24, 2009 Well the rad cap is the highest point, however it is attached to the overflow bottle. I "used" to have a surge tank in the system, I had the corvette surge tank on the bypass line running thru to the heater core. It would push water right into the overflow bottle and right on the ground. I was ticked off because this setup worked really well with a stock 2.8 engine. So I need to add another bleeder that will make 4 in the system! OK so when I bleed the system, I would open the lowest bleeders first (rads) then move to the one on the therm housing and then to the highest one ( the one I need to add) Now after all that I should not have any air pockets right??? Thanks guys Quote Link to comment Share on other sites More sharing options...
slick Posted July 24, 2009 Report Share Posted July 24, 2009 Yeah, I guess if it were me: Open all the bleeders at the same time, and close from the lowest to the highest. Once it is a solid stream of liquid, close it and move onto the next one. Overfill your overflow tank to compensate for the fluid thats going to get out of the bleeders, and be sure both radiators are as full as they can get. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted July 24, 2009 Report Share Posted July 24, 2009 one thing that I have found to really help with air in the system is to drill a small hole in your thermostat, makes bleeding a complete breeze. Quote Link to comment Share on other sites More sharing options...
slick Posted July 24, 2009 Report Share Posted July 24, 2009 one thing that I have found to really help with air in the system is to drill a small hole in your thermostat, makes bleeding a complete breeze. Definately. I've seen most aftermarket t-stats come with holes in them from the factory, but if not, be sure to do it. Quote Link to comment Share on other sites More sharing options...
hmdznrcld Posted July 25, 2009 Author Report Share Posted July 25, 2009 OK thanks, I do have to pull the injectors in the next week or so, I'll pull the thermostat and drill a few holes, hopefully this will cure my issues. I have had a friend or two say drill it but didn't want to pull her apart. Quote Link to comment Share on other sites More sharing options...
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