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Why would your 99 Jetta act as if it didnt have a thermostat when there is a new one installed?
Zemphi
Many things can cause this problem. The Jetta needs to be seen by a licensed mechanic to determine the exact cause.
Assuming you are not getting much heat from the heater, the heater core may be plugged or the temp blend door mechanism is faulty. With the engine warmed up and running, open the hood, locate both heater hoses, feel each heater hose with your hand, if both hoses are hot you probably have a temp blend door problem. If one hose is hot and the other is only warm you probably have a plugged heater core.
**seems to have proper heat from heater even when the temp gauge is low. The hoses I checked and both were warm. when I let it idle it gets up to temp but as soon as I start moving the temp jumps way down. Any more ideas?? ***
Borrow an infared temp gun and measure the temp at the thermostat housing. See if it matches what the vehicles temp gauge says. I'm thinking maybe the temp sending unit is faulty. If the vehicle's temp gauge reads low and the heater is putting out good heat my guess is the gauge is off. Hope this helps.
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