It depends on what you mean by tolerance. For example, a parent can tolerate or not tolerate a disobedient child. Either way it has nothing to do with being lukewarm. I can tolerate different religious beliefs (or lack there of), and by this I mean I accept that people are not all Christians and I don't look down on them for it, but as long as I do not say "well everyone is right in what they believe, and there is no wrong religious belief" I am not being lukewarm
Conversely, this whole "love homosexuals and admit that homosexuality is not a sin" craze sweeping through many modern Christian churches is a great example of tolerance causing someone to be lukewarm. However, on the same homosexuality branch if someone was to say "I tolerate homosexuals. I don't agree with their life style, but I tolerate" that would be an example of how tolerance is not lukewarm.
It all depends on the specific instance and type of tolerance really.