overheating. stat? waterpump?
Thread Starter
Advanced
Joined: Mar 2007
Posts: 74
Likes: 0
From: Vancouver BC
overheating. stat? waterpump?
I have a 2000 m6 that has been running fine all summer until today. The temps wet all the way to the red and I had to keep shutting my car down in the way home for it to cool. The overflow bottle was full and there were no leaks I could see. I checked the rad hoses and the lower rad hose was cold. I am thinking that either there is a problem with the thermostat or a problem with the waterpump. I am leaning towards thermostat as a pump usually never has a complete failure all of a sudden. Then again in my 20 years of working with cars I have never had a thermostat go bad either. Any ideas?
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
If the lower hose is cold, something for sure is impeding the coolant flow through the radiator. A stuck closed thermostat can certainly cause it.
