96Holly
Well-known member
This post is also under the C4 general discussion forum
I figured this was a better spot for this question.
I have a '96 LT4 with a Mez elec water pump installed last year. (Rad also removed and cleaned) The car ran great for a couple mo last season and good a for a couple of runs this season. Then it over heated at an ATM for no apperent reason. I have replaced all three relays (replace with only 5 prong... 4 prong not availible anymore?), replace one fan motor (right side) and replaced fuse (fuse blew because of fan motot being bad... assumption)
Once installed I filled the system, started car with both the air bleed screw open and small hose located on upper right side of rad loose. It purged over a few times but no big deal (probably the air in the system) once warm it gushed then subsided then gushed etc. Shut it down, refilled system opened up screw all the way till a steady steam came out. I got some fluid at the small tube as well. Closed everything up let it idle to hear the fans kick on at the right times.
Took off down the road with a cold engine to have it over heat again about 1.5 miles from the house. By the time I got it home the analog gage was pegged (that went first when I was 1.5 miles from home... I turned around to go home) and the digital was also in the 250 range with the dash lite up with "check gages". Oil temps never reached that high only about 220. As well it was about 5min or less with the analog and digital gage ringing high.
I plan to hard wire the fans and pump for any issues. I don't think the pump is wired with reversed pority due to it running so good last season. I am thinking more mechanicall like the impeller coming loose from the shaft or ???
Why would it only overheat under load and not at idle? ANY ideas/comments would be appreciated. sorry for so long winded, I like details when I am asked a question.
I figured this was a better spot for this question.
I have a '96 LT4 with a Mez elec water pump installed last year. (Rad also removed and cleaned) The car ran great for a couple mo last season and good a for a couple of runs this season. Then it over heated at an ATM for no apperent reason. I have replaced all three relays (replace with only 5 prong... 4 prong not availible anymore?), replace one fan motor (right side) and replaced fuse (fuse blew because of fan motot being bad... assumption)
Once installed I filled the system, started car with both the air bleed screw open and small hose located on upper right side of rad loose. It purged over a few times but no big deal (probably the air in the system) once warm it gushed then subsided then gushed etc. Shut it down, refilled system opened up screw all the way till a steady steam came out. I got some fluid at the small tube as well. Closed everything up let it idle to hear the fans kick on at the right times.
Took off down the road with a cold engine to have it over heat again about 1.5 miles from the house. By the time I got it home the analog gage was pegged (that went first when I was 1.5 miles from home... I turned around to go home) and the digital was also in the 250 range with the dash lite up with "check gages". Oil temps never reached that high only about 220. As well it was about 5min or less with the analog and digital gage ringing high.
I plan to hard wire the fans and pump for any issues. I don't think the pump is wired with reversed pority due to it running so good last season. I am thinking more mechanicall like the impeller coming loose from the shaft or ???
Why would it only overheat under load and not at idle? ANY ideas/comments would be appreciated. sorry for so long winded, I like details when I am asked a question.