driver8 Posted May 21, 2010 Share Posted May 21, 2010 How can you tell if your vaccuum pump isn't working? Do I have a vaccuum pump...or is it just a water pump? My coolant level is right at the top of my reservior, and isn't going down when it is cool. Is this a pump problem? Quote Link to comment Share on other sites More sharing options...
curiousB Posted May 21, 2010 Share Posted May 21, 2010 How can you tell if your vaccuum pump isn't working? Do I have a vaccuum pump...or is it just a water pump? My coolant level is right at the top of my reservior, and isn't going down when it is cool. Is this a pump problem? ??? Coolant is circulated by a coolant pump (often incorrectly called water pump). If engine isn't overheating then it doesn't seem like you have a problem. If car is overheating there could be an air lock impeding proper coolant circulation. I don't know of any vacuum pump onboard but vacuum exist when an engine is running on intake manifold and this is often used to power certain devices like cruise control actuator, HVAC vent doors. Not clear from your post what your problem is if any. Quote Link to comment Share on other sites More sharing options...
driver8 Posted May 21, 2010 Author Share Posted May 21, 2010 How can you tell if your vaccuum pump isn't working? Do I have a vaccuum pump...or is it just a water pump? My coolant level is right at the top of my reservior, and isn't going down when it is cool. Is this a pump problem? ??? Coolant is circulated by a coolant pump (often incorrectly called water pump). If engine isn't overheating then it doesn't seem like you have a problem. If car is overheating there could be an air lock impeding proper coolant circulation. I don't know of any vacuum pump onboard but vacuum exist when an engine is running on intake manifold and this is often used to power certain devices like cruise control actuator, HVAC vent doors. Not clear from your post what your problem is if any. Hi curious..thanks car isn't overheating..coolant just isn't rising up and down in reservoir..like it usually does.. I'm thinking it might be a thermostat problem? Quote Link to comment Share on other sites More sharing options...
steve2006 Posted May 21, 2010 Share Posted May 21, 2010 The level rises as the system pressurises if the temp gauge reading is normal it could be the cap on the expansion tank. Vacuum pumps are normally used on diesel engines to provide the vacuum for the power assisted brakes as there is no inlet manifold vacuum on diesels. Quote Link to comment Share on other sites More sharing options...
driver8 Posted May 21, 2010 Author Share Posted May 21, 2010 The level rises as the system pressurises if the temp gauge reading is normal it could be the cap on the expansion tank. Vacuum pumps are normally used on diesel engines to provide the vacuum for the power assisted brakes as there is no inlet manifold vacuum on diesels. thanks Steve...I'll replace the res cap...altho it is rather new. Quote Link to comment Share on other sites More sharing options...
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