Or should I take it to a shop to diagnose/repair it if the problem is more serious? What are the next steps? or estimated costs? Replace timing belt/pump? I think I could manage the job this time, maybe even a head gasket replacement. I've attached pictures, maybe someone has seen this before and can give me some armchair advice? I found posts that sometimes MDX water passage gaskets can go bad and leak, maybe that is causing the fluid to leak on top then drip down both sides? Should I get an exhaust gas test for radiator to confirm or rule this out? I don't see any white smoke in the exhaust, and when the engine runs with no radiator cap there are no bubbles coming up. I checked for oil on the spark plugs but they were dry. So then I thought maybe this was a head gasket leak? I checked the oil and it appears normal, under the oil cap, radiator & overflow appear normal. However I also see blue/green coolant residue on the transmission side of the engine under the water passage and I believe on the side of the transmission underneath. My thought was coolant is leaking from the gasket of the water pump, maybe the gates replacement wasn't the best. The engine temperature has never even gotten to halfway on the gauge. I'm keep topping up the coolant, it's been 2 jugs over 4 tanks of gas. (I assume the fan is blowing coolant onto the belt and its evaporating off the hot engine) After short drives there is also white steam coming from this area, and the belt is squealing. Now when the engine is running blue liquid is visibly dripping from around the timing belt cover. Under the car was pretty gunky so I cleaned it hoping to see if there was a visible leak and this seemed to make things worse. I wasn't seeing fluid under the car but found the radiator cap gasket was bad and replaced it hoping that was the problem, but fluid was still lowering. At home I found the radiator was nearly empty, I was surprised because the engine temperature never indicated it overheated. The current coolant problem came up when the cabin heat became intermittent on a long cold winter drive. Shop installed Gates timing belt / water pump in 2014, 80k miles ago. In the last year the radiator failed, and the pink milkshake took out the transmission, a shop rebuilt it, and installed new engine mounts and steering rack & pinion.ΔΆ004 MDX at 190k miles, my hope is to keep it until 300k. I've been able to tackle a number of first time jobs myself: valve adjustment, new alternator, new radiator, compressor clutch, serpentine belt, idle tensioner, throttle position sensor, brake pads, rotors, trailer hitch, transmission cooler, brake controller. Long time lurker, I've found this community so great to get DIY information.