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CAN A BAD CATALYTIC CONVERTER CAUSE MY CAR TO OVERHEAT?

Tiny
SANDEE WON
  • MEMBER
  • 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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Sunday, July 1st, 2012 AT 2:06 AM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
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.
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Sunday, July 1st, 2012 AT 2:22 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Also a plugged cat can cause the engine to overheat but so can a inop radiator fan etc.
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Sunday, July 1st, 2012 AT 2:23 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
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Sunday, July 1st, 2012 AT 6:30 AM

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