Everything new and car overheats
#1
Three Wheelin'
Thread Starter
Everything new and car overheats
Finally had a chance to drive the car around the neighborhood after a complete engine out refresh. Engine started to overheat after a few miles and spewed coolant. After cooling down, added more water and burped the system. Tried it again and the same thing happened.
WP is new, not rebuilt
All seals and o rings in the water bridge are new as well as the thermostat.
A couple of observations right after shutdown.
Upper rad hose hot
Lower rad hose not quite as hot.
Radiator warm.
Once cool, it is easy to squeeze the lower hose to burp the system.
When it was hot, right after shutdown, it was difficult to squeeze the lower hose like it was full of pressure???
WP is new, not rebuilt
All seals and o rings in the water bridge are new as well as the thermostat.
A couple of observations right after shutdown.
Upper rad hose hot
Lower rad hose not quite as hot.
Radiator warm.
Once cool, it is easy to squeeze the lower hose to burp the system.
When it was hot, right after shutdown, it was difficult to squeeze the lower hose like it was full of pressure???
#4
Team Owner
did you have the heads off?
Did you backflush the radiator with a hose after you removed it?
to fill the 928 cooling system,
with the car level
fill the bottle to just above the seam in tank,
then start engine turn on the heater to full hot,
run till the fans come on or for 10 mins till the thermostat opens,
both hoses are hot use an IR gun to test for temps. looking for about 185 top hose and 165 lower hose.
replace the cap drive the car for 5 miles with the heater on,
park it let it cool,
top up the system as necessary
Did you backflush the radiator with a hose after you removed it?
to fill the 928 cooling system,
with the car level
fill the bottle to just above the seam in tank,
then start engine turn on the heater to full hot,
run till the fans come on or for 10 mins till the thermostat opens,
both hoses are hot use an IR gun to test for temps. looking for about 185 top hose and 165 lower hose.
replace the cap drive the car for 5 miles with the heater on,
park it let it cool,
top up the system as necessary
#5
Three Wheelin'
Thread Starter
#6
Three Wheelin'
Thread Starter
Never took the heads off because they had just been off the car and freshened just before I got the car.
Radiator is a newer(2 years old) aluminum 928 Motorsports one. I did flush it with water when removed months ago.
Radiator is a newer(2 years old) aluminum 928 Motorsports one. I did flush it with water when removed months ago.
did you have the heads off?
Did you backflush the radiator with a hose after you removed it?
to fill the 928 cooling system,
with the car level
fill the bottle to just above the seam in tank,
then start engine turn on the heater to full hot,
run till the fans come on or for 10 mins till the thermostat opens,
both hoses are hot use an IR gun to test for temps. looking for about 185 top hose and 165 lower hose.
replace the cap drive the car for 5 miles with the heater on,
park it let it cool,
top up the system as necessary
Did you backflush the radiator with a hose after you removed it?
to fill the 928 cooling system,
with the car level
fill the bottle to just above the seam in tank,
then start engine turn on the heater to full hot,
run till the fans come on or for 10 mins till the thermostat opens,
both hoses are hot use an IR gun to test for temps. looking for about 185 top hose and 165 lower hose.
replace the cap drive the car for 5 miles with the heater on,
park it let it cool,
top up the system as necessary
#7
Administrator - "Tyson"
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#8
Race Director
Mine ran sorta cool with it backwards...only after 2 hours on track in reasonable temps did it finally overheat.....of course having Mark Anderson himself on your team helps...."Is the thermostat in correctly?" he asked...me "I dunno"...it wasn't....be fine ever since...
#9
First check the thermostat and gasket as others have suggested. If that's not your problem consider this: I had the same symptoms on my '89 car. It would overheat within 5-10 minutes. Turned out the coolant wasn't circulating because the water pump impellor had become loose on the shaft. I was told by the mechanic that it was a fairly common occurrence even with OE water pumps.
HTH
Colin
HTH
Colin
#10
Three Wheelin'
Thread Starter
I will first do as MrMerlin suggests and try the proper procedure on filling the system tomorrow. If that doesn't work, I will pull the thermostat and check.
#12
Team Owner
where did you get the waterpump?
what brand is it?
did you replace the rear seal for the thermostat in the water bridge?
what brand is it?
did you replace the rear seal for the thermostat in the water bridge?
#13
Three Wheelin'
Thread Starter
All the seals were replaced in the bridge and the smaller rear one as well.
#14
Team Owner
OK then
check thermostat first,
then refill as directed
check thermostat first,
then refill as directed