I have a 1998 SSEi which needs the heater core replaced.
Can anyone give me an idea of the cost of doing this?

Thanks,
Jim

If the dash has to come out like I think it does probably $500-$1000+ and I'd say probably closer to the high end of that for a shop to do it. I've done one on a Silverado for a family member and I still charged him $400 and it took the entire weekend to remove the dash replace the core, reinstall the dash and hook everying back up under the dash.

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2003 Pontiac Bonneville SSEI
3.8L V6 SC, 180*T (Drilled),
Custom PCM w/Perf Shift,
SLP Ceramic Coated Headers,
Thrasher Cold Air Intake,
GXP Tails, Interior Door handles, Trim pieces etc.
40th Aniv Grand Prix GTP Wheels (Very Shiny & Very Annoying )

I'm not sure on price but I didn't need to take the dash out when I replaced the heater core on my 95. It should be the same 92-99.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.