Mechanics

CAN A BAD CATALYTIC CONVERTER CAUSE MY CAR TO OVERHEAT?

1994 Infiniti Q45 • 130,000 miles

My Q45 is overheating after driving about twenty minutes at high speed. On hot days over 95 degrees. In phoenix, that is every day. I cleaned and flushed the cooling system, changed the thermostat, cleaned the MAF sensor, changed hoses, turned on the heater or AC, but nothing has made any difference. I also notice a loss of power when it is hot, and some engine farts too, so now I think my CAT my be the problem. How can I check the CAT on the vehicle?
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Sandee won
July 1, 2012.



To check the cat you would go to a exhaust shop and have a back pressure test done. Unless you wanted to buy a gauge to check it yourself but the gauges are about 50-60.

Saturntech9
Jul 1, 2012.
Also a plugged cat can cause the engine to overheat but so can a inop radiator fan etc.

Saturntech9
Jul 1, 2012.
Since the problem only occurs at high speed, that is an indication of inefficient cooling. Have the radiator checked, it most likely is partially clogged.

KHLow2008
Jul 1, 2012.