I am also having coolant problems. I notice my resevior will always go empty every few days. But the funny part is that my radiator is always FULL. At first I thought it was a blown headgasket but I checked for oil in coolant and coolant in the oil, both were fine. I had a cooling system compression test done by a shop and there was no leak, *I was standing right there when they did it*. The shop told me it might be a leaking headgasket, waterpump or even a cap. I was like, so what is it??? They couldn't give me a definite answer. The car never overheats.

I notice this happening after I changed the radiator (aftermarket OEM), cap (aftermarket), and thermostat (OEM). I was thinking it might be one of this.....leaning toward the cap.....

 

My vote would be the cap. If the cap isn't holding the proper pressure the coolant will evaporate into steam which will escape out of the cap. Hard to see while your driving.

Get the cap tested to see where it's holding pressure if at all and how much it should be and go from there.

 

It is definately the cap. I had the same problem after I upgraded the radiator and a faulty radiator car was the culprit of this.

 

I replaced the cap with a new one and still loosing coolant

HELP?

 

Did you use a stock cap or another aftermarket one? Could be the cap has the wrong specs.

Did you do a co2 test (with a sniffer) on your coolant system, you can determine if exaust gasses are leaking into it. Your shop can help you out with that. I'm thinking leaking headgasket.

 

When antifreeze/ coolant leaks it leaves a somewhat visable trail, start searching

 

I had the same problem on my car stock everything. It turns out since I cruise at higher range of normal, clamps at the rad could not hold the pressure and would let some coolant get by.

I got industrial clamps and replaced stock (they are almost 1" wide). No issues since.

 

Try this. Go out and purchase bright color ink such as red or purple. mix it in with coolant and drive the car as you normaly would. Next gay or two, check for any leaking red or purple ink around the entire cooling system.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CW-ITR &raquo;</TD></TR><TR><TD CLASS="quote">Next gay or two</TD></TR></TABLE>

After watching Will and Grace?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CW-ITR &raquo;</TD></TR><TR><TD CLASS="quote">check for any leaking red or purple ink around the entire cooling system. </TD></TR></TABLE>

Good idea. Also see if you have a red/purple smokescreen coming out of the back of your car Or just rev your car 4000 RPM while standing still, then get out and look for puddles. Higher RPM might bring up the pressure in the system, which may be why you haven't seen any leaks yet (at parking lot speeds).