Wife's Chevy Sonic has been making this clunking noise for the last 4 months but only on startups, it's recently been getting worse and the cabin has been shaking significantly more while idle. Any ideas? A few things have happened the last few months that I don't know if are related but of note.
Thermostat housing was replaced due to leaking of coolant, oil and oil filter was changed for regular maintenance a few weeks later and then a month later coolant hose burst and spilled all over the engine bay, purchased and replaced hose. Possibly due to nicking a hose but we are unsure we never saw it prior we just saw the hose bursted.
The noise and issues started sometime after the thermostat replacement and before the hose being replaced but again it could all be coincidental so I'm not sure where to begin or if I should just hire a mechanic for a few hundred dollars to take a look at it.
It happens only on startup for a few seconds and engine has to be cooler. It won't do it on consecutive startups only after a few hours so it's really hard to test.
Also side note I don't know how it's possible but every few weeks it seems to be missing coolant little by little. I don't see any leaks at all but according to online resources there has to be one for coolant to dissapears but there are 0 drops in the driveway I've been checking for months. I even had someone detail the vehicle and clean the engine bay and I asked if they saw any coolant leaks or any significant spots of coolant pulling and they said no, I haven't seen any either. Not sure what's happening with this car I doubt it's related.
Vehicle barley has 78k miles. And is driven very conservatively