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Re: jetta overheating
wolf, that's incorrect...
if u just turn on the vehicle, the t stat is still closed, giving u the temp difference between the hoses.
now, after the gauge picks up/ ~10 min @ idle, if they still feel as described by u, it would most likely be a stuck t stat...
the free loaner tool from autozone / another parts slinger, would give u a pressure tester to do it while your car is cold. pump it up to the specified pressure from the factory <don't go over this psi or u may blow out the heater core!>
then, u can look 4 leaks, starting around the hose clamps, that weep hole of the water pump, hoses around the intake manifold & firewall, etc.
u can also test the cap/ just replace it altogether. 1 psi= ~3 degrees F & u need that pressure/temp differential between the air<>radiator for a good heat exchange.
OP, did u remove the t stat to test it? then put it back in? if so, u have to be sure to bleed the air outta the system. some cars are harder to do than others.
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