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Author Topic:   Tow Rig Question
poboy2
Member
posted August 31, 2001 08:42 PM
Just put a new motor in the tow rig. 89' c3500 Chevy p/u 350 TBI. Acting very weird as far as the cooling. At idle it comes up to 195-200deg(Thats normal) But if you go to rev the engine a few times it starts to climb. Same thing if you go down the road a little ways. Climbs up to about 240-250 then cools a little. Almost acts as if the thermostat was opening and shutting so I replaced that.(No differance) All componants are new. Here thing that makes me wonder...Had to put a new head on drivers side. Plug for the temp sender WOULD NOT come out, so the person helping me told me that it would be no different by putting it in the right-side head. Could I be getting a false reading from this side of the engine???
Sure hated to see my new motor hit 250 (DANG!) Tomorrow I will get a new sender(Try to get the plug out of the L-side head) and a thermometer to stick in the radiator. If any one has any suggestions they would be helpful...Thanks


phelps
Member
posted August 31, 2001 10:07 PM
On the tbi chevy the intake gaskets have the rear water ports blocked off. I have seen a set put backwards & the front passages were blocked. It had very same symptoms.


racer2
Member
posted August 31, 2001 10:48 PM
my temp gage in my 89 1 ton dually varies a bit(about 10 deg up and down.for the running hot You might want to try a new clutch fan
or put a direct drive on it.


Pickel
Member
posted September 02, 2001 10:47 PM
I agree with phelps check your intake gaskets on the tbi intakes one side is blocked off. If you have just one on backwards it will cause it to overheat.


poboy2
Member
posted September 03, 2001 08:56 AM
I do know that they are on correctly, because I caught myself just about putting them on wrong. Here's the thing though. The temp sender was put on the pass. side head instead of the driver side. Well, on the pass. side, that would put the sender to the back of the engine, where the waterports are blocked. Could I be getting a false reading????


Pickel
Member
posted September 03, 2001 09:21 PM
Check your water pump to see if you have a reverse pump, or make sure you have the serpentine belt on correctly. Occasionally you can put them on backwards although they usually only fit one way.


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