air pump?

exwhyzee · 2003-06-26T19:20:49+00:00

I have a '90 Grand Marquis 5.0. The water pump, thermostat and allhoses were replaced approximately 5 months ago.Today, while riding on the highway, it is 100 degrees in NYC today, mytemp. gauge is fine until out of nowhere it rises to 3/4's of the wayup after riding for around a half hour with the gauge only 1/4 of theway past the "C", where it always is.The car did not overheat but the gauge stayed up there. When I finallygot to my destination and parked the car, before I shut it down, Ihear a knocking sound, which I never had. It does not sound like it iscoming from the engine, it sounds like it is coming from somewherearound the engine. I know it is impossible to explain a sound.To make a long story short, if I let the car cool down and start it upthe knocking goes away. If I get it real hot again the knocking comesback.I went to my mechanic and he was very busy and couldn't take my carbut he said that it sounds like it could be the "air pump" since thewater pump and thermostat were new, of which I know nothing about.I drove home and the same thing happened with the temp. gauge and theknocking was back when I got home. Waited about 20 minutes, started itup and no knocking.Any ideas anyone? Can the air pump be responsible for this?Thank you very much for any replies in advance!!

Jun 26, 2003 20 Replies

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Shawn 22 years ago

Yeah, until I get the Trailduster done. :) I still need to rebuild the engine, redo the exaust, and put in a 3/4-1ton 8 bolt frontend.

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