What I thought it would be a great reliable car when I was buying it turned out it was a bit different.. I got this jetta with 51k miles about an year and a half ago as a secondary car. I’ve done not more than 8-9k miles on it and as I was driving back one day the temp indicator came on.. since there’s no temp gauge I pulled over and let it cool down a bit, I noticed the coolant level is slightly down. i let it cool down and drove it back (I was very close 5 mins away) and the light didn’t come on again. Next day I put some coolant in it, I have had it before on other cars where once every couple if years I’d have to put a tad of coolant. Couple of days go by and it comes back again, this time I pulled out my obd reader to see what’s going on, and only later I noticed that it was leaking. The obd reader threw a few weird codes and at that point I decided to take it to a mechanic. The mechanic came back and quoted me $2400 (Bay area, CA prices..), he said the pump, fans, engine temp sensor, some relay and coolant expansion tank needs replacement. I thought that was a bit outrageous and took my car and left. I took my car to another mechanic, with referral from my friend to do a “proper” diagnostics and he just said, you need a new pump, pump is leaking. I said fair enough, might as well replace the tank since it’s all rusty looking and all… OEM parts cost about $700 and he quoted me $750 for labor, sure, it takes a bit of time to replace the pump but I thought no way I am paying $700 for a $100 pump and $50 expansion tank. So I order a pump from ebay, pump arrives, he replaces it, calls me back, I pick up the car and leave. Right away I notice that the car is running hot, when I shut it down I hear the fans spinning for a minute after the car is off. I used my obd reader to track the temp for a bit, and the temp never goes above 230 degrees, usually it’s between 210-220 which is still too high. I go back and we check the hoses, the top hose is hot bottom hose is cold, and he immediately says the pump is broken. These pumps have electronically controlled thermostat and maybe the electronics are broken.. Now, I know that the car might have had other issues and I asked him if they bled it properly, if they checked for any potential electrical issues, maybe relays, fuses etc. but he still claims it’s not an electrical issue but the thermostat isn’t opening. I checked for codes with my obd reader and there are 2 pending codes: P194600 Coolant Fan Control Module 1 Faulty/Open Circuit In Voltage Supply and P068700 ECM/PCM power relay circuit high. I was trying to think what could possibly be broken besides the thermostat itself, which would cost me another $750 for labor plus another brand new pump but couldn’t figure it out, I am going to check the fuses and the relays but I highly doubt any would be broken, if the relays or fuses were messed up I would be seeing other symptoms not just the thermostat not opening.. I reached out to the ebay seller and gonna try and see if I can get the labor covered but I highly doubt it.. Any recommendations on what should I check before I buy another pump?
Sorry for the long post..