Turning to the forum family for this one.. so I've been having a problem with my 01 A4 Quattro, at least I think it's a problem. What's been happening is that after driving, I shut my car off and when I turn it on after a minute or so, the temperature gauge needle moves up to the first line. I first noticed this while I was driving my car, I noticed that the needle would go smack dab in the middle and it slowly climbed up a little but then would move back down as I started driving. I took it to the mechanic who replaced my timing belt and they replaced the coolant temp sensor and thermostat (again). Now, the needle would sit a tad on the cool side while driving, sometimes it would move directly to the middle but nothing towards the hot side.
But when I would turn the car off and just turn it to the on position after it reaches operating temperature, the needle is back at the first line on the hot side. So I took it to another shop and they said my cooling system pressure is 70 PSI. They said I either have a cracked cylinder head or blown head gasket (it shouldn't be since the first shop replaced it). The first shop said they ran pressure tests overnight and they say the pressures aren't high. So idk what it could be..
Is it normal for the temp needle to go up (240 F) while the car is off then back to normal (190 F) when I start the engine and begin driving? And if not, could it be from a cracked head or head gasket not properly sealed? I also noticed that the overflow hose to the top of the coolant reservoir starts bubbling in the reservoir and the reservoir gets pretty hot too.
But when I would turn the car off and just turn it to the on position after it reaches operating temperature, the needle is back at the first line on the hot side. So I took it to another shop and they said my cooling system pressure is 70 PSI. They said I either have a cracked cylinder head or blown head gasket (it shouldn't be since the first shop replaced it). The first shop said they ran pressure tests overnight and they say the pressures aren't high. So idk what it could be..
Is it normal for the temp needle to go up (240 F) while the car is off then back to normal (190 F) when I start the engine and begin driving? And if not, could it be from a cracked head or head gasket not properly sealed? I also noticed that the overflow hose to the top of the coolant reservoir starts bubbling in the reservoir and the reservoir gets pretty hot too.
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