94 to 95 hose mod question
#1
Le Mans Master
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94 to 95 hose mod question
I am going to be helping a friend replace all of the coolant hoses on his 94 Vette. I remember discussions on going back with 95 hoses on a 94 and doing the TB by-pass at the sametime to clean up the engine bay. Anyone have any info on this?
#2
The lower radiator hose is the same on all, you only need to change the existing upper three piece combination (two hoses and tee) part numbers below.
The small hose from the tee in the upper rad hose goes to the port on the left side of the throttle body (inlet) remove the hose and cap the port on the throttle body,(rubber caps available at a parts store) then install the 95/96 one piece upper radiator hose.
The second part of the mod (or at least the way I did mine) goes like this. The early design has a second tee in the surge tank outlet hose, the hose from that tee connects to the outlet hose on the right side of the throttle body, the main surge outlet hose connects to the highest small port on the water pump.
Remove the throttle body outlet hose and cap the port at the throttle body using another rubber cap.
There are several ways to address the tee remaining in the surge outlet hose, cap the tee using another rubber cap, remove the tee and replace it with an inline coupler available at a parts store, or just install a one piece hose from the surge tank to the water pump using roll stock hose (3/4" ?)
Lower radiator hose (all)
10257252 (GM)
22464 (Gates)
24409L (AC Delco)
71646 (Dayco)
Upper radiator hoses (early)
10258276 (GM)
10258277 (GM)
Upper radiator hose (95/96=one piece)
10278338 (GM)
22463 (Gates)
24408L (AC Delco)
The small hose from the tee in the upper rad hose goes to the port on the left side of the throttle body (inlet) remove the hose and cap the port on the throttle body,(rubber caps available at a parts store) then install the 95/96 one piece upper radiator hose.
The second part of the mod (or at least the way I did mine) goes like this. The early design has a second tee in the surge tank outlet hose, the hose from that tee connects to the outlet hose on the right side of the throttle body, the main surge outlet hose connects to the highest small port on the water pump.
Remove the throttle body outlet hose and cap the port at the throttle body using another rubber cap.
There are several ways to address the tee remaining in the surge outlet hose, cap the tee using another rubber cap, remove the tee and replace it with an inline coupler available at a parts store, or just install a one piece hose from the surge tank to the water pump using roll stock hose (3/4" ?)
Lower radiator hose (all)
10257252 (GM)
22464 (Gates)
24409L (AC Delco)
71646 (Dayco)
Upper radiator hoses (early)
10258276 (GM)
10258277 (GM)
Upper radiator hose (95/96=one piece)
10278338 (GM)
22463 (Gates)
24408L (AC Delco)
#4
Drifting
Should be the same as my '93. Copied from an earlier post:
On my LT, I was able to use the following hoses to eliminate the 'tee'. Makes for a cleaner install. Then get a couple tube caps in the Help! section at the Zone and cap off the open tb tubes. I'm pretty sure the p/n's are NAPA.
NBH9097 - Lower Radiator Hose – Standard 1993 hose. Routes from the lower radiator to thermostat housing.
NBH9096 - Upper Radiator Hose – 1995 LT hose. Eliminates ‘Tee’ to TB. Routes from the upper radiator to the water pump housing.
NBH11743 - Heater Hose – Standard 1993 hose. Upper surge tank outlet to upper heater core inlet at firewall.
NBH11719 - Heater Hose – 1995 LT hose. Routes from the lower surge tank connection to the upper water pump housing.
NBH10729 - Heater Hose – Standard 1993 hose. Routes from the heater flow control valve to the lower water pump housing.
NBH9808 - Heater Hose – Standard 1993 hose. Routes from the lower heater core inlet to the heater flow control valve.
On my LT, I was able to use the following hoses to eliminate the 'tee'. Makes for a cleaner install. Then get a couple tube caps in the Help! section at the Zone and cap off the open tb tubes. I'm pretty sure the p/n's are NAPA.
NBH9097 - Lower Radiator Hose – Standard 1993 hose. Routes from the lower radiator to thermostat housing.
NBH9096 - Upper Radiator Hose – 1995 LT hose. Eliminates ‘Tee’ to TB. Routes from the upper radiator to the water pump housing.
NBH11743 - Heater Hose – Standard 1993 hose. Upper surge tank outlet to upper heater core inlet at firewall.
NBH11719 - Heater Hose – 1995 LT hose. Routes from the lower surge tank connection to the upper water pump housing.
NBH10729 - Heater Hose – Standard 1993 hose. Routes from the heater flow control valve to the lower water pump housing.
NBH9808 - Heater Hose – Standard 1993 hose. Routes from the lower heater core inlet to the heater flow control valve.
#5
Le Mans Master
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Jim, thanks for the info. It looks as simple as using a 95/96 upper radiator hose and then just replacing the 3/4" heater hose with a solid one piece hose. I think we will go that route since it is cheaper and eliminates a number of possible leak points.
#7
#8
I have a 92 and couldnt figure this out. I had the U hose from the radiator cap tank to firewall. Then a 1 inch from tank to 3/4 wp heater hose used hose connector to reduce. and a 3/4 heater hose from the firewall to WP.Am i missing something? the heater core or surge tank wouldnt have a hose on it
#9
I have a 92 and couldnt figure this out. I had the U hose from the radiator cap tank to firewall. Then a 1 inch from tank to 3/4 wp heater hose used hose connector to reduce. and a 3/4 heater hose from the firewall to WP.Am i missing something? the heater core or surge tank wouldnt have a hose on it
#10
Drifting
I have a 92 and couldnt figure this out. I had the U hose from the radiator cap tank to firewall. Then a 1 inch from tank to 3/4 wp heater hose used hose connector to reduce. and a 3/4 heater hose from the firewall to WP.Am i missing something? the heater core or surge tank wouldnt have a hose on it
Another heater hose runs from the heater core to an in-line flow control valve and on to the base of the water pump. That hose is to the right near the plug wires in this next pic.
#12
Le Mans Master
#15
Le Mans Master
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It makes a nice improvement in appearance by 'uncluttering' the engine bay. It also eliminates a few possible leak points and lastly it is also the best way (IMO) to do the TB by-pass.
#16
Instructor
Thanks!
Monk
#17
It is better to start a new thread than to bring up a old one.
Last edited by antfarmer2; 08-21-2015 at 09:28 AM.
#18
Pull the knock sensors to do a proper flush and use the spring clips not the screw type.