overheating problem

[whitedevilstealth]

Went to pure tuning in toledo and was running good on the dyno. But it started overheating and blowing coolant out of the overflow tank. So i took it home and re torqued the head bolts and took it for a drive. It boosted really good and seemed to not be blowing coolant but after I got on it for a while then stopped, it started overheating gradually. What do you think the problem is? I put somestock heads on it after the old ones got screwed up from a valve breaking. I put MLS gaskets on it, torqued them in sequence and in increments up to 94 ft lbs. When I got back home I let it sit and it overheated again then shut it off and put some coolant in it and it took half the jug, wtf, I'm at my boiling point with this car and have dumped way too much money into it for it to just sit around. Help would be appreciated.

[EvanH]

I had to run mine for hours, after I replaced my water pump. I had a hell of a air pocket. But now seems to be fine. Just get one of the funnels that attach to the water neck, and fill it, and let it run. You can keep the throttle at about 2k.

[whitedevilstealth]

I blead the system last night and pressure tested it and it held 20psi in the cooling system. Maybe there was a huge bubble.

[Amphiron]

Looks like your cars the one thats at its boiling point! da dum chii... Is it over heating anymore?

[Checkered vr4]

Went to pure tuning in toledo and was running good on the dyno. But it started overheating and blowing coolant out of the overflow tank. So i took it home and re torqued the head bolts and took it for a drive. It boosted really good and seemed to not be blowing coolant but after I got on it for a while then stopped, it started overheating gradually. What do you think the problem is? I put somestock heads on it after the old ones got screwed up from a valve breaking. I put MLS gaskets on it, torqued them in sequence and in increments up to 94 ft lbs. When I got back home I let it sit and it overheated again then shut it off and put some coolant in it and it took half the jug, wtf, I'm at my boiling point with this car and have dumped way too much money into it for it to just sit around. Help would be appreciated.
did you figure out this problem?

[markoverclock]

our cooling system (fan wise) sucks, they have the thermal switches that activate the fans to come on (not controlled by ecu), on the bottom of the radiator. This means fans don't come on till the whole dam radiator is hot as hell.

i installed a spal fan controller and fans. no overheating then.
or you could just at least weld some bungs into the cross over tube and move your sensors their and you should at least have your fans come on the correct way.

[MR2]

the Gen 1's have the bungs in the radiator...Gen 2 and above take it from the water neck.

[markoverclock]

Davids car was a 1993 vr4 still had bungs in radiator with thermal switches. The ecu sees temp in the water cross over pipe. also the guage temp is in the cross over and another sensor too.

but i dont know why they didnt put thermal sensors on their as well.

did they change that in 1994?

[stealthee]

94's have the gauge sensor and the fan sensor in the water housing.

[Checkered vr4]

so you guys think this is totally a cooling capacity thing?

[markoverclock]

94's have the gauge sensor and the fan sensor in the water housing.

look and see if you have any sensors on the bottom of radiator. if you do then your are controlled by them if you dont have any sensors on bottom of the radiator then yours is moved.

Im just curious could you go out and check??

[stealthee]

I do not have any sensors in my radiator. They were all moved in 94.

[Checkered vr4]

I blead the system last night and pressure tested it and it held 20psi in the cooling system. Maybe there was a huge bubble.

has this problem gone away now?

[Hans@GZP]

What coolant cap are you running? If stock, try running a 1.3 bar cap.

[Checkered vr4]

13psi stant cap. Tested good to 14psi

[Hans@GZP]

get a 1.3 bar cap and see if it overheats.

[Checkered vr4]

Ok, I'll try that. Thanks.