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1998 S70 T5 Unknown coolant leak only with heateroff, turbo?

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
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jcarlson
Posts: 1
Joined: 21 January 2014
Year and Model: 1998 s70 t5
Location: United States

1998 S70 T5 Unknown coolant leak only with heateroff, turbo?

Post by jcarlson »

image.jpeg
Hi,

I tried to search other posts for this issue before creating this, but with no luck.

I have a small coolant leak (small steady stream) draining under the driver side rear of the motor, basically under the turbo, but I can't get a visual from above or underneath. The strange part, is if I start the car with the heater on full blast, it doesn't leak. It's only when I turn off the heat, and then it leaks withing 1 or 2 minutes. I put UV dye in this morning which I will try again tonight. Anyone have information about a line or hose that water might be diverting through once the heater is off? Could this be connected to the turbo in any way?

I just purchased the vehicle last week with full service records from a mechanic and this began three days after. Any help is much appreciated, thanks!

Josh
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cn90
Posts: 8261
Joined: 31 March 2010
Year and Model: 2004 V70 2.5T
Location: Omaha NE
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Post by cn90 »

Stop driving the car now!

Spend some time and read through this thread...

DIY: 1998 S70 GLT Turbo Coolant Hoses and 2 Radiator Hoses
https://www.matthewsvolvosite.com/forums ... =1&t=55306
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+
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rspi
Posts: 7303
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Year and Model: 850 T-5R Wagon
Location: Cincinnati OH
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Post by rspi »

This car has several coolant hoses that carry coolant, none of which are effected by the heat being on or off. The car is equipped with a constant flow heater core which means coolant is ALWAYS flowing through it.

That side of the car has 2 heater hoses going into the firewall and 1 hose coming out of the turbo.
'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos
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rspi
Posts: 7303
Joined: 5 November 2011
Year and Model: 850 T-5R Wagon
Location: Cincinnati OH
Has thanked: 34 times
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Post by rspi »

https://www.matthewsvolvosite.com/forums ... =1&t=59851
'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos
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ehazel88
Posts: 18
Joined: 4 August 2013
Year and Model: xc70 1998
Location: maine

Post by ehazel88 »

back side of the motor you have a 2 inch piece of rubber hose going to the turbo. I bet that failed
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