07-10 water crossover

[Alex123]

Finishing up on my build 05 Saleen iron block forged internals. I am looking for an 07-10 water crossover pn 7R3E-8C369-AD. Overheating just a bit. New water pump and 3 core radiator. Now want to try and switch the crossover and hoses.

 

[stkjock]

welcome

so your looking for a source for the part number?

https://www.s197forum.com/threads/coolant-crossover-7r3e-8c369-ad.136912/

 

[Alex123]

Hello, I am looking for someone who has a spare crossover they can sell me.

 

[JeremyH]

07 config uses a hotter tstat. If you are having an overheating issue this wont likely fix it. Unless current tstat is stuck shut.

 

[Alex123]

07 config uses a hotter tstat. If you are having an overheating issue this wont likely fix it. Unless current tstat is stuck shut.

Yes but the Tstat is placed on the crossover itself. I assume it would absorb the heat better to open more frequently or a longer period of time? Also the crossover cuts out one extra hose may be a better flow of coolant. That was my logic behind it but could be wrong?

 

[JeremyH]

Its def a superior way for more precise temp control. Its bit less flow though going to one upper hose vice two. Either way it's a worthwhile mod but my point is if there's already a overheating issue somewhere just swapping likely wont solve it. Unless its tstat related.

 

[Dino Dino Bambino]

Finishing up on my build 05 Saleen iron block forged internals. Overheating just a bit.

Converting to the 07-10 coolant crossover won't solve the overheating problem, if indeed there is a problem.
Are you sure the engine isn't running lean and producing too much heat? Check the cats and scan their temperature from front to rear when fully warmed up.
How are your IATs? Is the intercooler water pump working efficiently enough? Have you checked the intercooler core to make sure it's clear of any deposits or debris?

 

[07 Boss]

So have you changed the thermostat? I saw no mention of that being looked at or swapped out? I would have assumed you did before you changed the water pump and radiator but you never know.

Are your fans coming on? Maybe set the high speed fan to come on at a lower temp.

Under what conditions does it overheat? All the time, cruising, stopped, doing pulls?

Have you thought about an electric pump? My car's temp gauge never even reaches the middle where it used to sit before going electrical. It stays there rock solid even sitting in traffic with the AC running under the Vegas summer sun. Point being the pump runs full speed all the time unlike your mechanical pump which is dependent on engine rpm's and slows down when you need it the most.

 

[Alex123]

Its def a superior way for more precise temp control. Its bit less flow though going to one upper hose vice two. Either way it's a worthwhile mod but my point is if there's already a overheating issue somewhere just swapping likely wont solve it. Unless its tstat related.

I see Tstat has been replaced twice and the coolant system has been bled as well. Car only overheats at a stand still and when I rev and hold at 2k rpms the car goes back to normal operating temperature. My tuner diagnosed it as the coolant not flowing at proper speed. He believes changing the crossover to the 07-10
Will improve the flow. Or can it possibly be a faulty water pump although it is brand new. On the other hand I was also thinking of a high flow Edelbrock pump

Converting to the 07-10 coolant crossover won't solve the overheating problem, if indeed there is a problem.
Are you sure the engine isn't running lean and producing too much heat? Check the cats and scan their temperature from front to rear when fully warmed up.
How are your IATs? Is the intercooler water pump working efficiently enough? Have you checked the intercooler core to make sure it's clear of any deposits or debris?

I will definitely check the cats and innercooler. I will double check with my tuner that is not running to lean. He just put a new tune in it since it’s also cammed The engine is still in the breaking in stage

So have you changed the thermostat? I saw no mention of that being looked at or swapped out? I would have assumed you did before you changed the water pump and radiator but you never know.

Are your fans coming on? Maybe set the high speed fan to come on at a lower temp.

Under what conditions does it overheat? All the time, cruising, stopped, doing pulls?

Have you thought about an electric pump? My car's temp gauge never even reaches the middle where it used to sit before going electrical. It stays there rock solid even sitting in traffic with the AC running under the Vegas summer sun. Point being the pump runs full speed all the time unlike your mechanical pump which is dependent on engine rpm's and slows down when you need it the most.

I see, Tstat has been replaced twice and the coolant system has been bled as well. Car only overheats at a stand still it takes about 15 minutes for it to start overheating and overheat very slowly. When I rev and hold at 2k rpms the car goes back to normal operating temperature. My tuner diagnosed it as the coolant not flowing at proper speed. He believes changing the crossover to the 07-10 crossover will improve the efficiency. fans are coming on and working properly

 

[01yellerCobra]

I'd say you have a restriction somewhere. Think of all the cars running your current hose set up with no issues. What radiator are you running? I've had a similar issue with other cars where it would run warm at idle but as soon as I raised the rpm it cooled right down. Both were radiator issues. With one of them when I went to check the coolant level half of the upper tank came off with the cap.

 

[sportinawoody]

take the fuse lid off, unbolt the 10mm nut with power lead, unbolt the 4x8mm bolts, unclip the fuse box from lower shell and wiggle it up. flip it over and inspect it, you should find melted pins and plastic. these will be your hi and lo fan relay circuits. common issue on these cars. this is why it only overheats while standing still because no air is moving thru the radiator

 

[sportinawoody]

i do have a crossover though if youre still content on changing it

 

[07 Boss]

I see Tstat has been replaced twice and the coolant system has been bled as well. Car only overheats at a stand still and when I rev and hold at 2k rpms the car goes back to normal operating temperature. My tuner diagnosed it as the coolant not flowing at proper speed. He believes changing the crossover to the 07-10
Will improve the flow. Or can it possibly be a faulty water pump although it is brand new. On the other hand I was also thinking of a high flow Edelbrock pump

I see, Tstat has been replaced twice and the coolant system has been bled as well. Car only overheats at a stand still it takes about 15 minutes for it to start overheating and overheat very slowly. When I rev and hold at 2k rpms the car goes back to normal operating temperature. My tuner diagnosed it as the coolant not flowing at proper speed. He believes changing the crossover to the 07-10 crossover will improve the efficiency. fans are coming on and working properly

take the fuse lid off, unbolt the 10mm nut with power lead, unbolt the 4x8mm bolts, unclip the fuse box from lower shell and wiggle it up. flip it over and inspect it, you should find melted pins and plastic. these will be your hi and lo fan relay circuits. common issue on these cars. this is why it only overheats while standing still because no air is moving thru the radiator

Yep, sounds like a fan issue if it is only happening at idle. It may be a flow problem too but check if your fans are coming on properly. If it is a flow problem that leads me back to the electric pump. It runs at full speed when your at idle. I've seen my temp gauge go down while sitting at idle in the staging lanes. I can't say enough about how well electric pumps work over mechanical. I've switched to electrical on every build I have ever done.

 

[07 Boss]

I'd say you have a restriction somewhere. Think of all the cars running your current hose set up with no issues. What radiator are you running? I've had a similar issue with other cars where it would run warm at idle but as soon as I raised the rpm it cooled right down. Both were radiator issues. With one of them when I went to check the coolant level half of the upper tank came off with the cap.

Could be too that the iron block is not shedding it's heat like an aluminum one too so it's hard to compare it all the others with the hose set up. Block could be cast a little different too with different coolant flow passages and such. I've never really examined one so I wouldn't know but there are more variables involved here.

 

[Dino Dino Bambino]

i do have a crossover though if youre still content on changing it

Does it come with the water neck for the upper radiator hose?

 

[01yellerCobra]

Could be too that the iron block is not shedding it's heat like an aluminum one too so it's hard to compare it all the others with the hose set up. Block could be cast a little different too with different coolant flow passages and such. I've never really examined one so I wouldn't know but there are more variables involved here.

Only other guy I can think of with the iron block was BruceH. But I don't remember what year his car was. But I'd still blame the block last. If it was a problem a lot of other engine swaps would be having overheating problems.

Also, what are we considering overheating? What temp thermostat is being used? People tend to forget the newer cars run hotter.

 

[slackinoff]

I have one if you want it.

 

[Alex123]

I'd say you have a restriction somewhere. Think of all the cars running your current hose set up with no issues. What radiator are you running? I've had a similar issue with other cars where it would run warm at idle but as soon as I raised the rpm it cooled right down. Both were radiator issues. With one of them when I went to check the coolant level half of the upper tank came off with the cap.

It does seem like a restriction. It’s a brand new mishimoto radiator. It’s seems that if the thermostat is not opening for long periods of time (ive replaces twice during this issue). The coolant coming from the bottom hose doesn’t seem hot enough to open the thermostat. I’m thinking the radiator is keeping the coolant temps down so the thermostat will not open? Going to try a 160f thermostat.

 

[Alex123]

take the fuse lid off, unbolt the 10mm nut with power lead, unbolt the 4x8mm bolts, unclip the fuse box from lower shell and wiggle it up. flip it over and inspect it, you should find melted pins and plastic. these will be your hi and lo fan relay circuits. common issue on these cars. this is why it only overheats while standing still because no air is moving thru the radiator

I will definitely check but the fan is coming on high and low

 

[01yellerCobra]

What temp thermostat are you currently running? What temp is the engine reaching when you say its overheating?