New Exhaust....Now Overheating...WHAT?!

[big blue]

OK Guys here's the deal, spent Saturday (yesterday) installing UPR x-pipe and magnaflow catback on the 5.0 . Took it for a test drive and man, it woke up the stock (down to the paper filter and snorkel) car alot. Now I am running hot . It used to hover around the middle of the guage now it spikes at the bottom of the N on the temp guage, and hovers around the O. What's up? I replaced the heater core and basicly flushed the cooling system in the process. I don't know the age of the thermostat but I can see it working. I need your guys help I don't want to fry the stang right after I just bolted on some upgrades. Any suggestion would be great.

 

[HISSIN50]

Has it run this way since you did the heater core? You very well might have air stuck in the bowels down there and it needs to be purged.

A search will reveal tons of info on how people do this (jacking front driver side, removing the ECT, etc etc).

Good luck.

 

[big blue]

Already searched and couldn't find a thing. I have been running fine on the heater core for months now with no problems (made sure to burp the system pretty good) this was a night and day event. Day before drove the car hard and no temp change. Now peaking out high. Don't have a clue. Anyone else?

 

[SPEEDYLIFSAVR]

It is strange that it would start to overheat after an exhaust upgrade . It doesnt really make sense . I had a very similiar experience after mt T-5z upgrade . My car just started to run hot . I racked my brain for a couple days trying to figure out what the correlation was . I couldnt find anything .

My theory is after the upgrade I was doing some pretty spirited driving and it was just enough to put stress on the 16 yr old water pump to cause it to fail . I replaced the water pump and upgraded the radiator , car runs cool as ice .

 

[big blue]

that's what I thought too. The revs come much quicker with a 2.5 from headers back rather than stock with weld in flows. I should look into replacing that stuff but hey that takes money.