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  1. S

    91 LS400 Heater/coolant issue!

    Where can I find the heater valve & do you suggest I replace the reservoir cap? How else can I test the pressure?
  2. S

    91 LS400 Heater/coolant issue!

    Hi All! My heater takes forever to heat up. I changed the thermostat and made sure my coolant is not leaking or blowing any white smoke out the exhaust, but I keep having to top off the overflow bottle. The weird thing is , it seems to heat up faster at higher speeds , then gets cooler as I...


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