Just two months ago I replaced my radiator when the car overheated. I replaced my thermostat as well and after flushing everything out, putting a coolant in 50/50 with water, today while doing emissions test, the car overheated again. There's absolutely no leak, the water pump was tested ok when I got my timing belts done relatively not long ago...what could it be?

Maybe the fan isn't engaging???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nek0 &raquo;</TD></TR><TR><TD CLASS="quote">... Maybe the fan isn't engaging???</TD></TR></TABLE>
You should be able to hear that yourself. You tell us.

The fan would only come on when you're not moving. Driving at 40 or 50 mph pushes more air thru the radiator than the fan does, anyway. Does it overheat when you're driving (not stuck in traffic)?

They're supposed to put a big fan blowing thru your radiator when they put it on the dyno, right? Did they do that when you got your emmissions test?

Let us know about all that stuff so our guessing doesn't have to be so wild...

 

Turn on your AC if both fans kick in, then that means your fans are working.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">
You should be able to hear that yourself. You tell us.

The fan would only come on when you're not moving. Driving at 40 or 50 mph pushes more air thru the radiator than the fan does, anyway. Does it overheat when you're driving (not stuck in traffic)?

They're supposed to put a big fan blowing thru your radiator when they put it on the dyno, right? Did they do that when you got your emmissions test?
</TD></TR></TABLE>

They never put a big fan in the front...ever. I overheat if I'm barely moving or stuck in a traffic. Never overheats when I'm driving.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quikrpm'z &raquo;</TD></TR><TR><TD CLASS="quote">Turn on your AC if both fans kick in, then that means your fans are working.</TD></TR></TABLE>

Well my AC compressor is shot. When I just turned it on, only one side comes on...

 

you could posibly have a bad head gasket, if not, check around your intake manifold, maybe a screw is loose n etc.

 

check compression or do a leakdown. Preferably leakdown.

Sounds like it could be a headgakset issue. Are you having oil in the coolant or coolant in the oil? Go check under your oil cap, and tell us if you find any milky residue.

It could also be heating up if you simply did not bleed all the air out correctly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by intekragsr &raquo;</TD></TR><TR><TD CLASS="quote">check compression or do a leakdown. Preferably leakdown.

Sounds like it could be a headgakset issue. Are you having oil in the coolant or coolant in the oil? Go check under your oil cap, and tell us if you find any milky residue.

It could also be heating up if you simply did not bleed all the air out correctly. </TD></TR></TABLE>

Nope, no oil in the coolant, I even flushed the fluid it out when I replaced the radiator & the thermostat. I don't see the fluid flowing after I turn on the engine for awhile...I recently did the timing belts & all the belts too...

Head gasket expensive/hard to replace?



Modified by nek0 at 6:30 PM 6/24/2003

 

you checked under your oil cap and its clean?

headgaskets are not hard, but very time consuming. Basically disconnect everything connected to it and around it to pull the head. It takes me maybe 3-4 hours depending on the mood and alcohol content of my blood.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nek0 &raquo;</TD></TR><TR><TD CLASS="quote">

I don't see the fluid flowing after I turn on the engine for awhile..</TD></TR></TABLE>

what do you mean by this? What was the procedure for your bleeding the coolant?

Warm the car up and let the fans kick on at least twice, or until it starts overheating, hold up the radiator bottle to light and see if bubbles are coming out of it.