All right guys, I am having a weird cooling problem. This is what happened. One of the taps on the radiator cap broke, let in air in the cooling system and overheated the engine, causing a blown head gasket. Replaced it with a new D series all metal head gasket and a timing belt change. After doing the head gasket replacement, there is no pressure on the radiator hose. The temp gauge doesn't move at all, and after running for couple of minutes, the radiator gets blazing hot. The fan kicks in and everything, but i am worried. anyone encounter anything like this? Scared, and am not driving it in till i figure this out.

 

anyone experienced something like this?

 

did you properly bleed the system of air bubbles? did you follow all torque specs for tightening the head down?

 

Which radiator hose are you referring to? The top hose should get hot. The lower hose coming from the t-stat will not get hot until the t-stat opens. Did you replace your thermostat?

 

system was bleed, and everything was torqued down to specs. As for the hoses, the top one has no pressure, you press on it and its like empty, and the radiator is very very hot. Never felt one that hot. the thermostat was fine before the HG change. I guess i should replace that and see.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D16SiHatch &raquo;</TD></TR><TR><TD CLASS="quote">did you properly bleed the system of air bubbles? did you follow all torque specs for tightening the head down?</TD></TR></TABLE>

Good point about the bleeding. Except the air will get much hotter than the coolant/water if the air pocket is around the temp sensor it will cause the gauge to read very hot when in fact it is not.

 

Could be a problem with your water pump not circulating as efficiently as possible. You should always replace it when you change your t-belt.

 

the funny this about the timing belt was when putting the head back on, something fell inside the cover and got caught. After taking it out, we saw the belt ripped a bit so we changed it. Motor was build 60 thousand miles ago, and did not see a point in changing the pump. Maybe I should have.

 

just changed the thermostat and same story. bleed the system again and same thing.

 

the radiator cap is what creates pressure, im thinking u could have a bad water pump. The impeller isn't creating flow. Whenever u change the belt,its a good time to replace the wp, peace of mind u know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cr-x-91 &raquo;</TD></TR><TR><TD CLASS="quote">the radiator cap is what creates pressure, im thinking u could have a bad water pump. The impeller isn't creating flow. Whenever u change the belt,its a good time to replace the wp, peace of mind u know.</TD></TR></TABLE>

The radiator cap does not create pressure. It only regulates pressure by releasing if necessary.

Pump creates flow, restrictions create pressure, cap regulates pressure.

A higher pressure cap allows the cooling system to operate at a higher pressure therefore causing a higher boiling point.

 

NO, your wrong. The cap is one of the main restriction in the system. The pressure it creates raises the boiling point of the cooling system 3 degrees for every pound of pressure.